The U of T Solar Fuels Cluster is an interdisciplinary research team devoted to developing scalable, cost effective materials solutions towards using CO2 as a chemical feedstock for valuable products. Leveraging the expertise of some of Canada's leading chemists, engineers, and material scientists, we hope to initiate a paradigm-shifting zero-emission CO2 economy.
November 13, 2020: Chimie douce: Green hydrogen
The literal translation of ‘chimie douce’, is ‘soft chemistry’. It carries connotations of reducing the extreme conditions of temperature, heat, and pressure often associated with traditional synthetic approaches for making solid-state materials to more gentle eco-friendly ambient ones. A recent Nature Energy article reports a low temperature water-splitting protocol that uses microwave power in lieu of concentrated solar energy using similar reversible metal oxide redox chemistry to the solar thermal water splitting process. The ability to “turn-down-the-heat” on these metal oxide redox cycles has been proposed to stem from microwave-induced electromagnetic field polarization, electron and oxide ion conductivity and thermalization effects. The processes work synergistically to facilitate elimination of oxygen and formation of oxygen vacancies in the metal oxide at temperatures below 250°C. See full article at Advanced Science News.
November 10th, 2020: Congratulations to Jiuli Guo and co-authors on their publication in ACS Catalysis!
In this work, Guo et al. use abundant and nontoxic hydroxyapatite to demonstrate high activity at a low cost by replacing constituent cations with transition metals to also enable tailoring of its catalytic properties. Using this method, the facile and scalable synthesis of a copper-substituted hydroxyapatite catalyst is presented, demonstrating its high activity in the reverse water gas shift reaction. Thorough in situ characterization using X-ray absorption and Fourier transform infrared spectroscopic methods provides unrivalled insight into both the structure of the active catalyst and the speciation of reaction intermediates. It is thus shown that this copper-substituted hydroxyapatite catalyst is an exemplary candidate for use in large-scale carbon dioxide reduction systems. See full article at ACS Catalysis.
November 5th, 2020: Congratulations to Athan Tountas and co-authors on their publication in Green Chemistry!
Fossil-free and affordable syngas routes to methanol is the focus of a version 1.0 tool for investigating prospective photochemical and thermochemical heterogeneous methanol synthesis catalysts via catalytic reactor transformation. This work presents thermochemical benchmarking data with a CZA catalyst in a continuous flow reactor. These unit operational conditions allow for more efficient CO2 utilization by improving low-temperature methanol yield and reducing capital and operating costs of process equipment. See full article at Green Chemistry.
The authors wish to acknowledge Dr. Chenxi Qian for the graphical art science image.
October 13th, 2020: Congratulations to Yang-Fan Xu and co-authors on their publication in Nature Communications!
In their work, Xu et al. focus attention on an archetypal nickel phosphide, Ni12P5, with a unique surface structure based upon well-separated few-atom Ni nanoclusters. This structure allows Ni12P5 to function as an exceptionally active, selective, and stable heterogeneous catalyst for the photothermal reverse water gas shift reaction under light irradiation. The advantages of high catalytic activity and light capture are also shared by other transition metal phosphides such as Co2P. The work demonstrates how transition metal phosphides, owing to their high-performance, good stability and cost-effectiveness, offer interesting opportunities for the development of photothermal CO2 conversion technologies. See full article at Nature Communications.
October 6th, 2020: Congratulations to Dr. Qian and co-authors on their recent lithium ion battery publication in Nano Letters!
Nanostructured electrodes are among the most important candidates for high-capacity battery chemistry. However, the high surface area they possess causes serious stability, cycling and safety issues associated with the solid-electrolyte interface. In this work, Qian et al. present a completely new strategy of limiting the effective surface area by introducing an “electrolyte-phobic surface”. In this approach, the surface of the active material is coated with a chemically tethered perfluorocarbon that provides it with a unique nonwetting behavior making it impervious to the electrolyte. The concept could prove to be a general strategy for minimizing the accessible surface area of high-surface-area materials in future applications in advanced batteries. See full article at Nano Letters.
September 17, 2020: What would a room temperature superconductor mean for the energy sector?
While superconductors are not considered an energy material, the energy savings arising from resistance-free transmission and distribution of electricity are potentially massive when considered on a global scale. Energy could also be saved by incorporating room temperature superconductors into electricity generating power plants, storing electrical energy as persistent currents in superconducting magnetic loops, employing magnetically levitated railways, using superconductor propulsion motors for maritime transport, and improving the energy efficiency of quantum computers with superconducting digital logic circuitry. See full article at Advanced Science News.
September 14, 2020: Imagining how “synthetic topology” could reform carbon dioxide catalysis
Solid-state physicists and materials chemists are in excellent “shape” to expand and accelerate their explorations of the science of topological materials for a wide range of possible applications. In particular, exploiting the reactivity of electrons at the surface of topological solids will prove to be of considerable interest in catalysis, whether a heterogeneous reaction is driven by heat, electricity, light or a combination thereof. See full article at Advanced Science News.
August 26, 2020: Dual aluminum-nitrogen battery that stores energy and fixes nitrogen
A recent report described an innovative rechargeable metal-nitrogen battery based on a graphene-supported palladium cathode and a polished aluminum anode interfaced with an ionic liquid electrolyte comprised of aluminum chloride/1-butyl-3-methylimidazolium chloride. Remarkably, the aluminum-nitrogen battery was demonstrated to serve the dual purpose of both storing and retrieving energy and having the ability to fix the nitrogen stream as ammonia. See full article at Advanced Science News.
August 25, 2020: What is the carbon footprint of carbon capture and utilization?
Capturing carbon dioxide and sequestering or converting it into sustainable chemicals and fuels can significantly help in mitigating emissions as we transition away from fossil fuels. But what exactly is the carbon footprint of such a process from cradle-to-grave? How much carbon dioxide feedstock needs to be captured to satisfy the demand for chemicals and fuels? And what is the energy demand of the CO2 capture and utilization processes? Geoff explores these pressing questions in his latest for Advanced Science News.
August 23, 2020: Celebrating the 77th birthday of "the father of Nanochemistry"—Geoffery Ozin, and his colorful career
To celebrate his 77th birthday, ASN reached out to the extraordinary Nanochemist at the University of Toronto, "the father of Nanochemistry", Geoffery Ozin, to discuss his colorful career, current projects, and plans for the future. The interview is summarized with the title "small materials with a big impact". See the full article at Advanced Science News.
August 5, 2020: Congratulations to Xiaoliang Yan and co-authors on the publication of their communication article in Small
1D silicon‐based nanomaterials, renowned for their unique chemical and physical properties, have enabled the development of numerous advanced materials and biomedical technologies. In this work, the authors demonstrate a flash solid–solid (FSS) process for the synthesis of silicon oxide nanorods that can be completed within seconds. The innovative features of this FSS process include its simplicity, speed, and exclusive use of solid precursors, comprising hydrogen‐terminated silicon nanosheets and a metal nitrate catalyst. See full article at Small.
August 4, 2020: Congratulations to Professor Ozin and co-authors on their article published in Energy & Environmental Science
Tailoring the performance of a photocatalyst by design is challenge in the field of renewable synthetic fuels. In this work, the authors demonstrate how polymorphic heterostructures comprised of two indium oxide based photocatalysts, with distinct structures yet continuously adjustable fractions of the same composition, enable optimization of the activity and selectivity of CO2 hydrogenation to CO and CH3OH. Interfaces formed between cubic and rhombohedral polymorphs with distinct electronic band structures, vacancies, and defects enable the charge generation, separation, and lifetimes of photogenerated electron-hole pairs to be finely tuned. See full article at Energy and Environmental Science.
July 28th, 2020: Congratulations Yuchan Dong and co-authors on their recently published Chemical Society Review paper, celebrating Geoff's 77th birthday and winning the front cover display of one of the highest impact factor journals in the field of chemistry
Powering the planet with sunlight-driven CO2 chemistry is an especially attractive approach for sustainable development. In this Tutorial Review, Yuchan Dong and co-authors highlight the multidisciplinary character of photocatalytic CO2 reduction studies from the perspective of materials chemistry, science and engineering, computational modelling, reactor engineering to process development. It provides a full picture of all the essential components for scaling laboratory research to pilot demonstration to implementation in industry, one-step closer to the vision of the solar CO2 refinery. See full article at Chemical Society Review.
July 11th, 2020: Congratulations Young Li and co-authors on their recently published paper
In this work, Young Li and co-authors report how a conformal coating of the well-documented catalyst promoter barium on the surface of palladium-decorated tungsten oxide nanowires was developed using a solution‐phase atomic layer deposition process. At just 0.2 atomic percent barium, a significant promotion of the light‐assisted activity of the reverse water gas shirt reaction was observed. See full article at Chemistry-A European Journal.
July 10th, 2020: The three colors of hydrogen
Everybody knows that H2, the archetype diatomic molecule, is a colorless gas. In the field of renewable energy however, hydrogen gas is now considered as either “grey”, “blue”, or “green”. This color code descriptor has arisen in order to differentiate hydrogen according to its source, in particular to distinguish hydrogen derived from fossil sources from that derived from renewable energy. Today, exciting steps are being made towards realizing this vision of a hydrogen-powered zero emission infrastructure. See full article at Advanced Science News.
July 8th, 2020: Congratulations to the authors of “Solution–Liquid–Solid Growth and Catalytic Applications of Silica Nanorod Arrays”
As an analogue to the vapor–liquid–solid process, the solution–liquid–solid (SLS) method offers a mild solution‐phase route to colloidal 1D nanostructures with controlled sizes, compositions, and properties. Direct growth of 1D nanostructure arrays through SLS processes remains in its infancy. This study shows that SLS processes are also suitable for the growth of nanorod arrays on the substrate. See full article at Advanced Science.
June 25th, 2020: Are we dehumanizing chemistry?
A new paradigm is emerging in the way materials are discovered on a computer and made in the laboratory. Computational searches can now be designed to aid the experimental discovery stage of a new material with a designated set of properties considered ideal for a particular application. On-line robot chemists can reduce these materials discovery pathways to practice thereby completing an accelerated materials discovery process. Is this what the future of chemistry holds for its creative inquisitive practitioners? See full article at Advanced Science News.
June 17th, 2020: What ever happened to combinatorial materials discovery?
It is not exactly clear whether the exciting potential of combinatorial chemistry research and development in the 1990s led to new products. After about a decade or so of intense activity and excitement, the field seemed to fade away. Today, synthetic chemists, artificial intelligence, machine learning, big data, supercomputers, computer simulations, and robotics appeared on our radar. At breakneck speed they started to take off where combinatorial chemistry had left off and the self-driving chemistry laboratory and artificial chemist made their debut. It will be very interesting to see if the “next industrial revolution” will be spawned by this new wave of computational materials research. See full article at Advanced Science News.
June 12th, 2020: Getting a charge out of liquid metal batteries
A novel concept in reversible chemical to electrical energy storage is the liquid metal battery, in which a metal anode, metal cathode, and salt electrolyte are all in the liquid phase. Although the liquid metal battery is heavy, it could be more suitable for large scale electricity storage. In this article, Geoffrey Ozin explains the operation, advantages, and potential impact of liquid metal battery technology. See full article at Advanced Science News.
June 4th, 2020: Flying high on carbon dioxide: Decarbonizing aviation
In a pilot plant demonstration of the EU-project Sun-to-Liquid, a solar thermochemical process has been successfully scaled to a solar tower in Madrid, leading to the first-ever production facility for making synthetic kerosene from water and carbon using concentrated solar energy. This pioneering development is at the foundation of the partnership of the two ETH spinoffs, Climeworks and Synhelion, with Lufthansa who are working to commercialize and implement the technologies at an industrial scale for direct air capture and solar fuels production. See full article at Advanced Science News.
May 26th, 2020: Online learning in a pandemic: A perspective
The whole world is being challenged momentarily. Everyday routines and habits have come to a halt and we are getting used to new daily schedules. School is now online for many students worldwide, and the idea and introduction of online schooling was quickly sprung upon us. It has been very difficult to get used to this “new normal” system and operate not only as a student, but equally a teacher. See full article at Advanced Science News.
Monday, May 18th, 2020: Congratulations to Lu Wang and co-authors on their publication in Nature Communations
Black indium oxide comprises amorphous non-stoichiometric domains of In2O3-x on a core of crystalline stoichiometric In2O3. In their paper, Lu Wang and co-authors demonstrate black indium to have a 100% selectivity towards the hydrogenation of CO2 to CO with a turnover frequency of 2.44 s−1. Their result shows that based on its activity, selectivity and stability, black indium oxide outperforms all known indium-oxide-based photocatalysts.
Monday, May 11th, 2020: Cobalt Plasmonic Superstructures Enable Almost 100% Broadband Photon Efficient CO2 Photocatalysis
Congratulations to the authors of “Cobalt Plasmonic Superstructures Enable Almost 100% Broadband Photon Efficient CO2 Photocatalysis” for having their paper recently accepted to Advanced Materials. Their work demonstrates photothermal hydrogenation of CO2 using a plasmonic superstructure, consisting of an array of nanoneedles, to enhance the absorption of sunlight. See full paper at Advanced Materials.
Tuesday, May 5th, 2020: Thoughts on materials discovery at the human-machine interface
The emergence of artificial intelligence, machine learning, and robotic automation in the field of materials discovery can really take-off where combinatorial materials chemistry left-off and positively disrupt the field of materials chemistry as we know it today. In this opinion editorial, Geoff explores how “energy materials discovery” is used as a training ground to explore this question and compare and contrast the old way with the new way of operating in an attempt to discover how humans and machines can work harmoniously together to the benefit of each. See full article at Advanced Science News.
Friday, May 1st, 2020: Congratulations to Athan Tountas, Wei Sun, and co-authors on the success of their papers!
Congratulations to all the authors of the 2019 review, “Towards Solar Methanol: Past, Present and Future" and the 2019 paper, “Living Atomically Dispersed Cu Ultrathin TiO2 Nanosheet CO2 Reduction Photocatalyst". Their work is among the top downloaded articles featured on Wiley Advanced Science. The success of these papers among readers highlights their significance and impact in their respective fields.
Thursday, April 23rd, 2020: Congratulations Xian-Wei Lv, Lu Wang, and co-authors on your recently accepted paper!
Nitrogen fixation using electrochemistry presents an environmentally-sound alternative to the energy-intensive Haber-Bosch process. Using air as the feed stock would represent an important step towards future industrialization of green ammonia. In their paper, ZIF-supported AuCu Nanoalloy for Ammonia Electrosynthesis from Nitrogen and Thin Air, Lv, Wang, and co-authors report a gold-copper nanoalloy-decorated zeolitic imidazolate framework that exhibits a high ammonia yield, remarkable efficiency, long-term stability and pH independence, demonstrating the technological viability of producing ammonia from thin air.
Tuesday, April 21st, 2020: Is your work not novel enough?
Global scientific output roughly doubles every nine years and editors are left facing the tsunami of publications seeking homes in elite journals. The situation has created the perfect storm for biased selection criteria – whether intentional or unintential - at the peer review gate, putting many researchers at a disadvantage. Is it time to rethink our values in higher education and place real science and social creativity as the key criteria in this sector rather than productivity and profit? Perhaps the time has come to rethink how and where we showcase our breakthroughs. See full story at Advanced Science News.
Monday, April 20th, 2020: Upcoming Book Release
It is with great excitement that we wish to announce the upcoming release of The Story of CO2: Big Ideas for a Small Molecule by Prof. Geoffrey Ozin and PhD candidate Mireille Ghoussoub. The Story of CO2 is anticipated for release in October 2020 by University of Toronto Press. Now available for pre-order!
About the book: The climate crisis requires that we drastically reduce carbon dioxide emissions across all sectors of society. The Story of CO2 contributes to this vital conversation by highlighting the cutting-edge science and emerging technologies – a number of which are already commercially available – that can transform carbon dioxide into a myriad of products such as feedstock chemicals, polymers, pharmaceuticals, and fuels. This approach allows us to reconsider CO2 as a resource, and to add "carbon capture and use" to our other tools in the fight against catastrophic climate change.
Friday, March 27th, 2020: Seeking connection through art in a pandemic
With the COVID-19 pandemic threatening public health and rapidly spreading around the world, science communication has never been more timely. In their article, Dr. Geoffrey Ozin and artist Todd Siler engage in cross-disciplinary collaboration to speak to what is currently happening around the globe. The artwork displayed in this article intimates how a chance natural event can create a widespread human catastrophe; one that involves a molecular biological assembly, a nano-bio-scale material, as exemplified by COVID-19. See full story at Advanced Science News.
Monday, March 10th, 2020: Prof-Bot: The autonomous chemistry professor
Are the wide-ranging tasks and the vast repertoire of skills of the university teaching professor replaceable by a robot? With recent developments in supercomputer power, big data, artificial intelligence, and machine learning, it is not beyond the realm of possibility that with all-knowledge endowed robot educators and robot assistants could rise to match or even outperform professors and teaching assistants in the theater of higher learning. See full story at Advanced Science News.
February 28th, 2020: Autonomous Chemical Synthesis
The self-driving chemistry laboratory has now made its debut, thanks to advances in artificial intelligence, machine learning, big data, supercomputers, and robotics. The possibilities for chemistry now seem boundless, only constrained by the imagination of humans and/or robots who are going to have to learn to live, work, and play together. As self-driving laboratories further develop, it is worth asking how this will impact the nature of chemistry research and direct innovation in the chemical sciences in the long-term. See full story at Advanced Science News.
February 18th, 2020: Absolute zero: A counter-intuitive energy transition
Net zero emissions by 2050 was a target set by the Intergovernmental Panel on Climate Change to increase our changes of limiting global temperature rise to under 1.5 °C. But how feasible is this in practice? Absolute Zero, a recent report laid out by British researchers, argues that the 2050 target can only be achieved via large-scale implementation of tried and trusted technologies, such as solar, wind, and geothermal power. Newer, riskier approaches, such as those based on hydrogen, bioenergy, and carbon capture, will likely require longer than 30 years to develop, deploy, and scale, and therefore may not be suitable for meeting short-term emission targets. See full story at Advanced Science News.
January 28th, 2020: Congratulations to Mireille Ghoussoub on winning 1st Place in the 3MT Competition at the WISE National Conference!
PhD Candidate Mireille Ghoussoub placed first in the Three Minute Thesis Competition at the Women in Science and Engineering (WISE) National Conference over the weekend. Her research focuses on merging experimental and computational characterization tools to study catalysts for converting carbon dioxide into methanol.
The WISE National Conference serves as a catalyst to inspire and empower individuals to pursue their passions, broaden their horizons, and form meaningful connections. The conference brings together delegates from all across Canada to share ideas and become inspired over the course of a two-day event dedicated to professional and personal growth, featuring inspirational leaders from a wide range of STEM fields, as well as workshops, case competitions, and career fairs.
January 20th, 2020: Financing Net Zero
Making financial policy a centerpiece for governments, businesses, and partnerships is a critical piece to achieving a net-zero economy. A challenge in this, however, is to build comprehensive transparency by all climate stakeholders on climate change, risk management, and investment to help companies deal with the financial stress associated with the potentially disruptive effects of a global energy transition. See full story at Advanced Science News.
January 10th, 2020: Nano-silicon Samurai
In addition to being an important element in living organisms, silicon is by far the most widely used of all semiconductor materials. Most recently, however, nano-silicon has been demonstrated to be an attractive tool in the field of environmental remediation, specifically when it comes to cleaning up oil spills from underwater drilling and hydraulic fracking. Here, the notable advance is that surface-engineered porous nano-silicon sponges demonstrate a strong affinity for emulsified oil in seawater. See full story at Advanced Science News.
December 20th, 2019: A Fossil Fuel-Free Industrial Revolution
While coal combustion energized James Watt’s steam engine, it is seldom acknowledged that other sources of energy were also known at the time. As recently as the late 1800s, electricity could be generated for a myriad of applications through the use of waterwheels and windmills. The fact that these technologies were contemporaries of the now-dominant internal combustion engine suggests that non-fossil energy technologies were equally poised to become globally widespread. But could the technological revolution of the 18th and 19th centuries have happened without the use of fossil fuels and the rampant burning-down of forests? See full story at Advanced Science News.
December 16th, 2019: Congratulations to Dr. Pavani Cherukupally, Wei Sun and co-authors on your publication in Nature Sustainability!
In their paper, “Surface-engineered sponges for recovery of crude oil microdroplets from wastewater”, Cherukupally and Sun et al. report an innovative surface engineered sponge that combines surface chemistry, pH-responsive surface charge, and micro-nano roughness that allows for upwards of 92% of crude oil to be adsorbed under ambient conditions. Their work constitutes a new framework for developing surface engineered sponges that addresses the variable pH-responsive wetting behaviour of crude oil and further demonstrates the environmental remediation potential of adsorptive recovery through sponge technology. See full story at Nature Sustainability.
December 4th, 2019: Sunshine Not Moonshine – Happy Hour with Carbon Dioxide
Many novel chemistry and engineering approaches now exist that enable CO2 to be recycled into a cornucopia of products ranging from plastics and pharmaceuticals, to fertilizers and concrete, and even aviation and clean diesel fuels. One particularly innovative, and perhaps less conventional solution, to have recently emerged is an eco-friendly vodka made from CO2 and H2O. This concept has been realized through The Air Company, a legal distillery and start-up company located and operating out of Brooklyn, run by two young entrepreneurs, Stafford Sheehan and Gregory Constantine. See full article at Advanced Science News.
November 25th: Congratulations to Dr. Hong Wang and co-authors on their Advanced Science Cover!
Congratulations to Dr. Hong Wang and co-authors on having their article, “CO2 Photoreduction: Heterostructure Engineering of a Reverse Water Gas Shift Photocatalyst” featured on the cover of Advanced Science Online. The image is the creation of artist and researcher, Dr. Chenxi Qian. See full article at Advanced Science Online.
October 25th: Gigawatt Electricity Storage Using Water and Rocks
The dominant technology for the large-scale storage and retrieval of electricity is pumped hydro - electrical energy. In this approach, electricity is converted to gravitational potential energy by moving water uphill and is then retrieved by allowing the water to flow downhill through a turbine. However, a new concept in gravity storage eliminates the need for hills and simply uses water pumps to hydraulically lift massive rocks in an underground shaft. The acquired potential energy is reclaimed as electricity by discharging the water under pressure though a turbine. See full article at Advanced Science News.
October 17th, 2019: Beyond Haber-Bosch: Non-Equilibrium Photocatalysis
A recent report in which the thermodynamic equilibrium limit of the Haber-Bosch synthesis of ammonia was, for the first time, surmounted by the action of light, and could change the prevailing view of what is possible and not possible in the field of catalysis. A hetero-nanostructured photocatalyst, Fe-TiO2-xHy, which contains both a high and low-temperature site in a single structure has been demonstrated to overcome the thermodynamic equilibrium limit of the ammonia synthesis. This is possible because the exothermic ammonia synthesis process is thermodynamically favored though kinetically sluggish at low temperature; however, the exact opposite prevails at high temperature. See full article at Advanced Science News.
October 14th, 2019: Climate Change Will Require Heavy Lifting
As the global hunger for electricity grows and the transition to solar and wind accelerates, electricity storage capacity is urgently needed to handle the challenges of scale and intermittency. Concrete solutions are needed to solve the large-scale electricity storage problem for both daily and seasonal applications, and it’s going to require some heavy lifting. A new generation of gravity batteries have emerged based on the lifting and lowering massive concrete weights. The solution may prove a viable option for storing and releasing grid scale electrical energy over periods as short as seconds to as long as months, which would represent a significant step towards renewable energy utilization. See full story at Advanced Science News.
October 9th, 2019: A Whale of a Solution to Climate Change
Strategies to enhance the carbon capacity of the terrestrial and oceanic sinks tend to focus on landscapes – forest canopy, soil composition, and sea water chemistry. However, we must not neglect the role of animals in maintaining the natural carbon cycle. As it turns out, whales have the capacity to absorb enormous amounts of atmospheric carbon dioxide (CO2). Estimates place the carbon sequestering capacity of a whale to be similar to around 1000 trees with an average whale capturing up to 33 tons of CO2 over its 60-year lifetime, centuries. Efforts to re-establish whale populations, together with large scale reforestation, therefore offer a surprinsingly impactful solution to meeting global emission targets. See full article at Advanced Science News.
October 4th, 2019: Congratulations to Hong Wang et al. on their publication in Advanced Science, “Heterostructure Engineering of a Reverse Water Gas Shift Photocatalyst”
The paper describes a heterostructure engineering strategy that enables the gas-phase, photocatalytic, heterogeneous hydrogenation of CO2 to CO with high performance metrics. The catalyst is comprised of indium oxide nanocrystals (In2O3-x(OH)y) nucleated and grown on the surface of niobium pentoxide nanorods. Materials characterization demonstrates that the Nb2O5 support in the In2O3-x(OH)y@Nb2O5 heterostructure increases the number of oxygen vacancies and lengthens the excited state charge carrier lifetimes in the attached In2O3-x(OH)y nanocrystals, which results in a 44-fold higher conversion rate than pristine In2O3-x(OH)y selective conversion of CO2 to CO as well as long-term operational stability. Overall, the results of this study bode well for the general applicability of the heterostructure engineering approach for optimizing the performance of photocatalytic heterogeneous CO2 conversion reactions. See full article at Advanced Science.
September 20th, 2019: SF6 Worries - The Most Potent and Persistent Greenhouse Gas
It is not well known, but the most potent greenhouse gas is, surprisingly, neither carbon dioxide nor methane, but a colorless, odorless, and inert gas known as sulfur hexafluoride (SF6). With a global warming potential 23,900 times that of CO2 and being synthetic in nature (it is not absorbed on destroyed naturally), rising SF>6 concentrations are of major concern. Currently, electrical utilities and equipment are responsible for consuming 80% of the 10 000 tons of SF6 produced every year, an amount which is growing with the increasing global production and demand for renewable forms of energy, such as wind and solar. Can chemists and engineers rise to the challenge of solving the looming SF6 problem? See full article at Advanced Science News.
September 16th, 2019: Congratulations to Young and co-authors on their article in JACS
Atomically precise heterostrucutures present chemically interesting active sites for catalysis but are often expensive and/or challenging to synthesize. In this article, we report a synthetic strategy to conformally coating Cu atoms onto the surface of Pd/HyWO3-x by anchoring Cu(I)OtBu to the Brønsted acidic protons of the bronze. It was observed that just 0.2 at.% of Cu was able to increase the catalytic performance of CO2 hydrogenation to CO by 500%. This metal anchoring method enables atom precise modification of the surfaces of metal oxide nanomaterials for catalytic applications, circumventing the need for complex and expensive atomic layer deposition processes. See full article at Journal of the American Chemical Society.
September 9th, 2019: Congratulations to Lili Wan, Wei Sun, & co-authors on their article in Nature Catalysis
A long-standing challenge in the field of CO2 utilization is how to stabilize Cu2O, an earth-abundant, non-toxic, low-cost (photo)catalyst that can facilitate reduction of CO2 to CO against the irreversible redox disproportionation Cu2O → Cu + CuO, responsible for its instability.
Lili Wan and Wei Sun and coworkers in the Ozin group have solved this problem as reported in their Nature Catalysis paper, by modifying the surface of Cu2O nanocubes with a mixed valence surface frustrated Lewis pair (SFLP), Cu(I,II) ●● OH, which serves to eliminate the redox disproportionation. As depicted in the illustration, H2 undergoes heterolytic dissociation on the SFLP, water is eliminated to create an [O] vacancy and Cu(I) is reduced to Cu(0). Adsorption of CO2 at the [O] vacancy site drives the conversion to CO thereby completing the photocatalytic RWGS reaction cycle. See full article at Nature Catalysis online.
August 13th, 2019: Congratulations to Dr. Zaiyong Jiang et al. on their paper, "Building a Bridge from Papermaking to Solar Fuels"
Everybody knows the leaf makes carbohydrates and the trunk makes paper. But did you know that waste from the paper making process can make fuel from carbon dioxide, water and sunlight? Black liquor, an industrial waste product of papermaking, is primarily used as a low‐grade combustible energy source. Despite its high lignin content, the potential utility of black liquor as a feedstock in products manufacturing, remains to be exploited. In this paper, black liquor is demonstrated to function as a primary feed‐stock for synthesizing graphene quantum dots that exhibit both up‐conversion and photoluminescence when excited using visible/near‐infrared radiation, enabling solar‐powered generation of H2 from H2O, and CO from H2O–CO2, using broadband solar radiation. See full article at Angewandte Chemie.
August 7th, 2019: Congratulations to Zaiyong Jiang, Wei Sun, & co-authors on their article in Advanced Science
In their paper, “Living Atomically Dispersed Cu Ultrathin TiO2 Nanosheet CO2 Reduction Photocatalyst”, Jiang, Sun, and co-authors report a serendipitous living photodeposition method can make atomically dispersed Cu immobilized on ultrathin TiO2 nanosheets, which can photocatalytically reduce an aqueous solution of CO2 to CO and in the process can be recycled in a straightforward procedure on becoming oxidatively deactivated. See full article at Advanced Science.
July 17th, 2019: Fundamentals and Applications of Photocatalytic CO2 Methanation
Light-driven methanation of CO2 holds great promise to close the carbon cycle and store and transport intermittent solar energy in the form of the chemical bonds of synthetic, “solar” methane. In their Review article published in Nature Communications, Geoffrey Ozin, Uli Ulmer and co-authors critically appraise the latest scientific discoveries in the field of photocatalytic CO2 methanation. The photocatalytic methanation schemes explored include photothermal, plasmonic, biophoto, heterogeneous and homogeneous photoredox methanation. Photocatalytic CO2 methanation could eventually replace fossil CH4 if implemented at a large scale.
July 5th, 2019: Challenges of Electrifying Heterogeneous Catalysis
How can we replace the fossil-fuel-derived heat that conventionally drives chemical processes with an emissions-free alternative? The current standard in industrial-scale heterogeneous catalytic processes, such as the production of ammonia and hydrogen, is to use heat supplied by the combustion of natural gas. Heat can alternatively be supplied from non-fossil sources, such as renewable electricity; however, assessing the net impact on carbon emissions of electricity-based processes remains non-trivial. Read full article at Advanced Science News.
June 21th, 2019: Electrochemical Carbon Dioxide Reduction in Supercritical Carbon Dioxide is Cool
At standard temperature and pressure, CO2 exists as a gas. On cooling to -78.5 °C, it becomes a solid called dry ice, which is a common refrigerant. At a critical temperature of 31.1 °C and pressure 72.9 atmospheres, however, CO2 becomes a supercritical fluid with properties intermediate to a gas and liquid. In this form, CO2 fills a containment vessel and exhibits a low viscosity reminiscent of a gas but retains the high density of a liquid. It turns out that supercritical CO2 also has rather appealing properties as both solvent and reagent in the electrochemical reduction of CO2 to a variety of products. Read full article at Advanced Science News.
June 13th, 2019: Congratulations to Dr. Xiaoliang Yan and co-authors on their paper, “Nickel@Siloxene catalytic nanosheets for high-performance CO2 methanation”
Two-dimensional materials hold great potential as catalysts for the heterogeneous conversion of CO2 to synthetic fuels and chemicals. In this paper, Yan et al. demonstrate the performance of nickel@siloxene to be highly sensitive to the nickel component being located either on the interior or exterior of adjacent siloxene nanosheets. Control over the location of nickel is achieved by employing the terminal groups of siloxene and varying the solvent used during its nucleation and growth, which ultimately determines the distinct reaction intermediates and pathways for the catalytic CO2 methanation. A CO2 methanation rate of 100 mmol gNi−1 h−1 is achieved with over 90% selectivity when nickel resides specifically between the sheets of siloxene.. See full paper at Nature Communications.
June 10th, 2019: Congratulations to Dr. Tingjiang Yan and co-authors on their paper, “Polymorph selection towards photocatalytic gaseous CO2 hydrogenation”
Titanium dioxide is the only known material that can enable gas-phase CO2 photocatalysis in its anatase and rutile polymorphic forms. In their paper, however, Dr. Yan and co-authors demonstrate that the lesser known rhombohedral polymorph of indium sesquioxide, like its well-documented cubic polymorph, can act as a CO2 hydrogenation photocatalyst with the ability to produce CH3OH and CO. See full paper at Nature Communications.
June 5th, 2019: Electricity-free Renewable Hydrogen
A recent paper published in the Proceedings of the National Academy of Science has reported that applying carbon capture and utilization (CCU) to manufacture the top 20 commodity chemicals could mitigate up to of 3.5 gigatonnes of carbon emmisions annually, equivalent of nearly 10% of the emissions released in 2018. The study found CCU’s potential to be contingent on whether the vast amount of electricity it would require could actually be provided given the limited renewable electricity infrastructure that currently exists. How do we decide which energy-consuming processes should be made priority? Read full article at Advanced Science News.
May 21st, 2019: Global Carbon Dioxide Cooling
It may come as a surprise, but carbon dioxide, the infamous greenhouse gas driving climate change, is also a leading contender in the replacement of hydrofluorocarbons in the next-generation of “green” refrigeration systems. It offers many advantages over second and third generation refrigerants, including higher volumetric cooling capacity, lower operating temperatures, non-flammability, reduced operating costs, and lower global warming potential. See full article at Advanced Science News.
May 14th, 2019: Congratulations to Dr. Lu Wang and co-authors on their paper in Angewandte Chemie!
Surface Frustrated Lewis Pairs (SFLPs) have been implicated in the gas‐phase heterogeneous (photo)catalytic hydrogenation of CO2 via the cubic form of hydroxylated indium oxide. In their paper, Dr. Wang and co-authors report the room temperature dissociation of molecular hydrogen via SFLPs on the rhombodral form of the catalyst, which is shown to favour the heterolysis over the homolysis reaction pathway. See full article at Angewandte Chemie.
May 3rd, 2019: Is Air Conditioning Cool?
When one thinks of the major sources of anthropogenic emissions entering the earth’s atmophsere, chances are that air conditioning (AC) isn’t the first to come to mind. However, the carbon footprint of AC systems is far from negligeable: they are expected to contribute an additional 167 gigatonnes of CO2 by 2050. But what if AC systems could be re-designed to provide an opportunity to capture CO2 from the air? Global adoption of on-site conversion of CO2 from AC systems into chemicals and fuels could have a key role in addressing global climate change. Read the full article at Advanced Science News.
May 1st, 2019: Crowd oil not crude oil
Congratulations to authors Prof. Roland Dittmeyer, Michael Klumpp, Paul Kant, and Prof. Geoffrey Ozin on the release of their Nature Communications article, “Crowd oil not crude oil”. The delocalized nature of climate change poses a major challenge to mitigation efforts. The authors propose retrofitting air conditioning units to convert water and carbon dioxide into fuel. The users would collect the synthetically-made oil for their personal use, or to redistribute within their community, as to encourage decentralized CO2 conversion and energy democratization. Read the full article at Nature Communications.
April 25th, 2019: Advanced Science News: “Spamming Science”
The internet has had profound effects on virtually all aspects of society. It has revolutionized every part of our lives, from the ways in which we engage and communicate, to our shopping and entertainement habits, to our media and politics. But what of the effect of the internet age on academia? As one of the earliest adopters of email communication, academics have witnessed the many ways in which the internet has shifted the nature of scientific collaborations, publishing processes, and research patterns. Have we, however, reached a point where electronic communication has become more problematic than beneficial to academic research? Read Prof. Ozin and Prof. Seferos’s take in Advanced Science News.
April 20th, 2019: Congratulations to Athan Tountas & co-authors for having their review article featured in Advanced Science’s 5 Year Anniversary Digital Issue!
On the occasion of its 5th anniversary, Advanced Science’s virtual issue collects a celebratory series of invited-only articles which showcase the outstanding achievements of leading international researchers in the field of materials science, physics and chemistry, medical and life sciences, as well as engineering. In their article, “Towards Solar Methanol: Past, Present, and Future”, Athan Tountas and co-authors provide an overview of how conventional industrial-scale fossil-enabled heterogeneous catalytic conversion of carbon monoxide and hydrogen to methanol is being challenged by more sustainable electrocatalytic, photocatalytic, biocatalytic, and solar thermal methods using carbon dioxide and water as feed-stocks. See full article at Advanced Science. Cover art courtesy of Dr. Chenxi Qian.
April 11th, 2019: Energy & Environmental Science Cover Page!
Congratulations to authors Mireille Ghoussoub, Meikun Xia, Dr. Paul Duchesne, and Prof. Dvira Segal, as well as cover artist and alumnus, Dr. Chenxi Qian, for having their recently published review article featured on the cover of Energy and Environmental Science. Photothermal catalysis is an emerging sub-discipline of heterogeneous catalysis that exploits broad absorption of the solar spectrum to stimulate a combination of thermochemical and photochemical processes, which contribute synergistically to driving catalytic reactions. It is proving an effective and promising strategy for converting CO2 to synthetic fuels. See full article at Energy & Environmental Science.
March 20th, 2019: Putting a Spin on a Carbon Photocatalysis Spin-off
Chemicals and fuels derived from CO2 and enabled by solar power have taken the research world by storm over the past decade. However, CO2-derived fuel technologies, as promising as they may appear, are still subject to the harsh economic realities of chemical engineering. Is it possible to simultaneously achieve high photonic efficiencies all whilst adhering to the logic of economies of scale? Two new start-ups, The Solistra Corporation and Dimensional Energy, have taken on this challenge and are paving the way towards a future driven by solar fuel technology. Read full story at Advanced Science News.
February 22nd, 2019: Industrial Carbon Dioxide Photoctatalysis
Where did the use of light to drive catalytic reactions all begin? Why are metal oxides a good choice for light-assisted chemical reactions? How can we design better photoreactors to integrate into the existing chemical infrastructure? Finally, what are the prospects for global industrial photocatalysis? Learn the answers to all these questions and more as the University of Toronto Solar Fuels Group shines light some of the technological challenges facing the widespread industrialization of CO2 photocatalysis. Read full story at Advanced Science News.
February 21th, 2019: Congratulations Dr. Yang-Fan Xu on being selected as a recipient of the 2019 University of Toronto, Faculty of Arts & Science Postdoctoral Fellowship Award
The Faculty of Arts and Science (FAS) Postdoctoral fellowship is a highly competitive and prestigious award designed to provide outstanding recent doctoral students advanced training in their field of study. This year the FAS received over 140 applicants. The Solar Fuels Groups is pleased to announce that Dr. Yang-Fan among the few selected recipients.
February 19th, 2019: Congratulations to Athan Tountas and Co-authors on your Solar Methanol Advanced Science Paper!
“Towards Solar Methanol: Past, Present, and Future” provides a comprehensive overview of how value-added products, notably methanol, can be produced affordably and sustainably from greenhouse gases. Harnessing light in the form of solar energy can assist is the production process in some capacity through various strategies, such as solar-thermochemical, photochemical, and photovoltaic-electrochemical. Commercially-ready technologies are compared via technoeconomic analysis, and the scalability of solar reactors is also discussed in the context of light-incorporating catalyst architectures and designs. Finally, the review offers perspective on the viability of the most promising solar methanol strategy to be applied at a global scale. Read full story at Advanced Science.
January 10th, 2019: Catalytic CO2 Reduction by Palladium Decorated Silicon Hydride Nanosheets
Congratulations to Wei, Chenxi, Govind, and Co-Authors on their New Years Eve Nature Catalysis publication in which they report on their discovery of how to make Silicon, the second most abundant element on earth, behave catalytically in the gas-phase heterogeneous hydrogenation of CO2 to CO, known as the Reverse Water Gas Shift Reaction. See full article at Nature Catalysis.
January 8th, 2019: Congratulations Mireille, Dvira, Meikun, and Paul on your EES article which shows how producing synthetic fuels by photothermal gas-phase heterogeneous CO2 catalysis is within our hands!
Photothermal catalysis is an emerging sub-discipline of heterogeneous catalysis that exploits broad absorption of the solar spectrum to stimulate a combination of thermochemical and photochemical processes, which contribute synergistically to driving catalytic reactions. In particular, it is proving an effective and promising strategy for converting CO2 to synthetic fuels. See full article at Energy & Environmental Science.
December 20th, 2018: The Agnotology of Carbon Dioxide
In 1995, Robert Proctor of Stanford University coined the term, “Agnotology”, refering to the study of how and why we do not know things as a means of addressing the rapid dissemination of misleading, confusing, frightening and false information. Although early works in this field were focused on the understanding the ignorance around smoking and cancer risk, Agnotogy is highly relevant to the current rhetoric surrounding climate change. The reality is that CO2 emissions due to human activity are contributing to climate change and that to limit the warming from pre-industrial levels to 1.5 °C these emissions must be reduced to zero by 2050. Unfortunately, however, denial or acceptance of global warming often stems from selectivity in the search for evidence and political leaning. See full story at: Advanced Science News.
December 18th, 2018: Congratulations to Dr. O’Brien et al. on their paper “Enhanced photothermal reduction of gaseous CO2 over silicon photonic crystal supported ruthenium at ambient temperature”
Solar-driven CO2 hydrogenation can provide a renewable source of fuels and reduce greenhouse gas emissions at industrial scale. The paper investigates the light-driven Sabatier reaction over Ru films sputtered onto silica opal (Ru/SiO2) and inverted silicon opal photonic crystal (Ru/i-Si-o) supports. Under ambient temperature conditions, photomethanation rates over both the Ru/SiO2 and Ru/i-Si-o catalysts were shown to increase significantly with increasing light intensity, and rates as large as 2.8 mmol g−1 h−1 are achieved over the Ru/i-Si-o catalyst. Furthermore, the quantum efficiency of the photomethanation reaction was found to be almost three times larger when measured over the Ru/i-Si-o catalyst as compared to the Ru/SiO2 catalyst. DFT analysis indicate that charged Ru surfaces can destabilize adsorbed CO2 molecules and adsorb and dissociate H such that it can readily react with CO2, thereby accelerating the Sabatier reaction. See full paper at: Energy & Environmental Science.
December 6th, 2018: CO2 Conversion and Corrosion: Mind the Gap
The community of scientists and engineers dedicated to the development of synthetic fuels made from CO2 is large and growing. From catalytic synthesis to reactor design, these researchers work on devising strategies to yield the most energy efficient and cost-effective CO2 conversion technologies. There exists, however, another community of experts also dedicated to working on CO2, albeit from a very different perspective: these are the scientists and engineers dedicated to the capture, purification, transportation and distribution of CO2 for either storage or enhanced oil recovery purposes. Their attention is largely focused on the important, and yet often forgotten corrosive nature of CO2 on processing equipment, containers, and pipelines made of carbon steel. Given the current trend, these seemingly disparate fields would greatly benefit by overcoming the CO2 communications gap, which appears to exist between scientists and engineers working on these problems. See full story at: Advanced Science News.
November 19th, 2018: Preventative Care of Our Planet – A Global Renewable Synthetic Fuels Roadmap
Synthetic fuels made using non-fossil renewable sources of energy, could make a significant contribution to achieving the 1.5 °C objective set out by the Paris Climate Agreement. While not widely recognised, technologies for making such synthetic fuels are in an advanced state of technological readiness; however, large-scale production will entail further development of several technologies, decision-making on where to locate different facilities, and the building of infrastructure to transport the fuels to where they are needed. A recent report put forth by Frontier Economics at the commission of the World Energy Council in Germany seeks to develop a dedicated roadmap for establishing a global renewable electricity to fuel industry. See full story at: Advanced Science News.
October 23rd, 2018: U of T Solar Fuels Group Joins Final of the Carbon XPRIZE
The University of Toronto Solar Fuels group has recently joined C4X, an NRG COSIA Carbon XPRIZE finalist, in their effort to create viable carbon dioxide utilization technologies in an effort to alleviate the effects of global warming caused by atmospheric greenhouse gases.
This new partnership brings together several large emitters and technology providers, enabling a clear path forward for validation of new carbon-reducing technologies on an industrial scale. Partners include:
- C4X Technologies Inc., led by Dr. Wayne Song (Toronto, ON)
- PERDC of Ford Motors Canada, led by Dr. Jimi Tjong (Windsor, ON)
- PolyBio Inc., led by Professor Mohini Sain from the Department of Chemical Engineering (Toronto, ON)
- The U of T Solar Fuels group, led by Professor Geoffrey Ozin from the Department of Chemistry (Toronto, ON)
- Walkerville Brewery, led by Neil Bishop
C4X is currently operating in Suzhou, China, and is planning to expand operations to Canada through this partnership.
The University of Toronto Solar Fuels group develops solar-driven technologies for the conversion of greenhouse gases like carbon dioxide into value-added chemicals and products. This opportunity to scale these technologies in a real-world setting is a major step forward in the path to commercialization of this work.
October 20th, 2018: Congratulation to Jinlong Gong for your paper in Angewandte Chemie!
Selectively targeting one high value-added chemical fuel, such as methanol, from CO2 reduction in aqueous solutions remains a grand challenge. By intentionally constructing a well-defined defined Cu/Cu2O interface, the binding strength of surface adsorbed H* and CO* intermediates could be balanced in a photoelectrochemical reduction of CO2 in aqueous solution, leading to methanol production with an impressive Faradaic efficiency of 53.6%. The full paper, entitled “Tuning Cu/Cu2O Interfaces for Reduction of Carbon Dioxide to Methanol in Aqueous Solutions”, can be found at Angewandte Chemie.
October 3rd, 2018: Human Intelligence and Experiential Learning in Materials Discovery
We have arguably reached a point in the evolution of materials chemistry where the discovery of a brand-new material or novel material property is rare. Although there will, of course, always be the occasional eureka moment, current materials research is mainly focused on the design of self-assembled material architectures that yield specific properties to satisfy the function required of an application. An inevitable question in today’s technological context, however, is the role of artificial intelligence in the materials research process. Can AI be trained to accomplish tasks and practice continual learning, intuition, and creativity, in a manner that matches or even supersedes human intelligence? See full story at: Advanced Science News.