FES Funded ProjectsOutputs
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| TiO2 Nanotube - Noble Metal Nanoparticle Heterojunction Photocatalysts for CO2 ReductionThe sunlight-driven transformation of CO2 into hydrocarbon fuels is a highly challenging photocatalytic reaction which involves six to eight electron transfer steps. Even though titanium dioxide nanomaterials are currently some of the best performing photocatalysts for CO2 reduction, the reaction yields for CO2 photoreduction are currently limited by (i) Inadequate harvesting of visible photons (ii) Poor adsorption of reactants on to catalyst surfaces (iii) Inefficient charge transfer to adsorbates and (iv) Recombination losses. Amongst various types of titania nanomaterials, vertically oriented TiO2 nanotube arrays stand out for their self-organization and tunability of geometric dimensions (diameter, wall-thickness, tube length and intertubular spacing). When TiO2 nanotubes are decorated with noble metal nanoparticles (NPs), the resulting heterojunctions are able to overcome or mitigate the technical problems limiting higher CO2 reduction rates and we have been able to achieve methane yields as high as 3.7 mL g-1 h-1. Isotope labeled reactants were used to verify that the reaction products were indeed formed due to CO2 reduction. However the phase composition of TiO2, the nature of the noble metal NP deposition process, and the type of noble metal used play a critical role in determining the performance of CO2 reduction photocatalysts based on such heterojunctions. Our investigations showed that anatase-rutile mixtures perform better than either anatase or rutile alone. Similarly, photodeposition and grafting of colloidal NPs on to the nanotubes were found to be superior methods to form the heterojunction compared to direct vacuum deposition (sputtering) of noble metal islands followed by annealing. T12-P02 University of Alberta | Activity | 2018-06-20 | | | Decoupling structure-sensitive deactivation mechanisms of Ir/IrOx electrocatalysts toward oxygen evolution reactionT06-P04, T09-C01 University of Alberta | Publication | 2019-03-01 | | | Base metal-catalyzed, additive-free C–O bond cleavage of β-O-4 lignin model compoundsAs an outgrowth of our work in aromatic-selective C-S bond hydrogenolysis, new catalysts for lignin-related C–O bond hydrogenolysis are discussed.T09-C01 University of Alberta | Activity | 2019-03-31 | Orain Alberga Brown, Asama Vorapattanapong (Leduc), Semagina, N., Jeffrey Mark Stryker | | Inhibition of diolefin hydrogenation by quinolineFull PaperT09-C01 University of Alberta | Publication | 2020-06-15 | | | Potassium-aided processes for sulfur removal from bitumenT09-C01 University of Alberta | Publication | 2020-08-11 | | | A Niobium Catalyst for Partial UpgradingT09-C01 University of Alberta | Activity | 2020-11-23 | | | Hydrotreating behavior of niobium catalystT09-C01 University of Alberta | Activity | 2021-04-30 | | | State-of-the-Art Iridium-Based Catalysts for Acidic Water Electrolysis: A Minireview of Wet-Chemistry Synthesis Methods: Preparation routes for active and durable iridium catalystsWith the increasing demand for clean hydrogen production, both as a fuel and an indispensable reagent for chemical industries, acidic water electrolysis has attracted considerable attention in academic and industrial research. Iridium is a well-accepted active and corrosion-resistant component of catalysts for oxygen evolution reaction (OER). However, its scarcity demands breakthroughs in catalyst preparation technologies to ensure its most efficient utilisation. This minireview focusses on the wet-chemistry synthetic methods of the most active and (potentially) durable iridium catalysts for acidic OER, selected from the recent publications in the open literature. The catalysts are classified by their synthesis methods, with authors’ opinion on their practicality. The review may also guide the selection of the state-of-the-art iridium catalysts for benchmarking purposesT06-P04 University of Alberta | Publication | 2021-01-01 | | | Impact of Different Supports on the Performance of Ir Oxide Based Catalysts Synthesized Using Incipient Wetness MethodT06-P04 University of Alberta | Publication | 2022-10-10 | | | Study of electrochemical performance of IrOx/ATO catalysts with different Ir loading in acidic water electrolysisT06-P04 University of Alberta | Publication | 2022-05-23 | | | Phase Transition Engineering of Host Perovskite toward Optimal Exsolution-facilitated Catalysts for Carbon Dioxide ElectrolysisT02-P03 University of Alberta | Publication | 2023-05-23 | Bowen Zhang, Mengnan Zhu, Minrui Gao, "Jian Chen ", "Xiuan Xi ", Shen, J., "Renfei Feng ", Semagina, N., "Nanqi duan ", Zeng, H., Luo, J. | | Fluorine-Stabilized BO6 Octahedron of Host Perovskites for Robust Carbon Dioxide Electrolysis on Exsolved CatalystsT02-P03 University of Alberta | Publication | 2023-10-02 | Bowen Zhang, Mengnan Zhu, Minrui Gao, "Xiaoyu Liu ", Shen, J., "Xiuan Xi ", "Nanqi Duan ", Semagina, N., Zeng, H., Luo, J. | | Strong Metal-Support Interactions in ZrO2-Supported IrOx Catalyst for Efficient Oxygen Evolution ReactionThe use of ZrO2 as a support material for IrOx-based catalysts in oxygen evolution reaction (OER) electrocatalysis was studied using ex-situ characterization and rotating disk electrode electrochemical testing of supported IrxZr(1-x)O2 on ZrO2 of varying sizes. The catalyst exhibited high OER mass (specific) activity (712 Aurn:x-wiley:18673880:media:cctc202300668:cctc202300668-math-0001 ) and intrinsic activity (4.8 mAurn:x-wiley:18673880:media:cctc202300668:cctc202300668-math-0002 ) at 1.6 VRHE, attributed to IrxZr(1-x)O2 alloy formation, an interconnected network of Irx Zr(1-x)O2 nanoparticles and the presence of Ir(III)/Ir(IV) species throughout the bulk. It also appears to be resistant to Ir dissolution; however, accumulation of O2 bubbles in the catalyst microstructure and minor phase transformation of Ir(III)/Ir(IV) species during OER cause deactivation. Temperature-programmed desorption indicated a possible link between the observed high activity and higher amounts of adsorbed H2O and desorbed O2 species.T06-P04 University of Alberta | Publication | 2024-01-05 | | | Low loading inkjet printed bifunctional electrodes for proton exchange membrane unitized regenerative fuel cellsT06-P04 University of Alberta | Publication | 2023-01-01 | | | Characterization of particles generated by non-catalytic methane pyrolysis in a tubular flow reactorT02-P01 University of Alberta | Publication | 2024-11-08 | Arash Naseri, Ehsan Abbasi Atibeh, "Kiasadegh, M ", Shen, J., Secanell, M., Semagina, N., Olfert, J. |
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