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 | | | Inhibition of diolefin hydrogenation by quinolineFull PaperT09-C01 University of Alberta | Publication | 2020-06-15 | | | 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. | | 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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