FES Funded Projects Outputs Show only Author
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Projects
Bifunctional Oxygen Electrodes for PEM-Unitized Regenerative Fuel Cell Fabricated By Inkjet Printing T06-P04, T06-A03 University of Alberta Publication 2024-10-22 T06-P04, T06-A03 TiO2 Nanotube - Noble Metal Nanoparticle Heterojunction Photocatalysts for CO2 Reduction The 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 T12-P02 Decoupling structure-sensitive deactivation mechanisms of Ir/IrOx electrocatalysts toward oxygen evolution reaction T06-P04, T09-C01 University of Alberta Publication 2019-03-01 T06-P04, T09-C01 Base metal-catalyzed, additive-free C–O bond cleavage of β-O-4 lignin model compounds As 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
T09-C01 Inhibition of diolefin hydrogenation by quinoline Full PaperT09-C01 University of Alberta Publication 2020-06-15 T09-C01 Potassium-aided processes for sulfur removal from bitumen T09-C01 University of Alberta Publication 2020-08-11 T09-C01 A Niobium Catalyst for Partial Upgrading T09-C01 University of Alberta Activity 2020-11-23 T09-C01 Hydrotreating behavior of niobium catalyst T09-C01 University of Alberta Activity 2021-04-30 T09-C01 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 catalysts With 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 T06-P04 Impact of Different Supports on the Performance of Ir Oxide Based Catalysts Synthesized Using Incipient Wetness Method T06-P04 University of Alberta Publication 2022-10-10 T06-P04 Study of electrochemical performance of IrOx/ATO catalysts with different Ir loading in acidic water electrolysis T06-P04 University of Alberta Publication 2022-05-23 T06-P04 Phase Transition Engineering of Host Perovskite toward Optimal Exsolution-facilitated Catalysts for Carbon Dioxide Electrolysis T02-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. , Jingli Luo
T02-P03 Fluorine-Stabilized BO6 Octahedron of Host Perovskites for Robust Carbon Dioxide Electrolysis on Exsolved Catalysts T02-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. , Jingli Luo
T02-P03 Strong Metal-Support Interactions in ZrO2-Supported IrOx Catalyst for Efficient Oxygen Evolution Reaction The 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 T06-P04 Low loading inkjet printed bifunctional electrodes for proton exchange membrane unitized regenerative fuel cells T06-P04 University of Alberta Publication 2023-01-01 T06-P04 Characterization of particles generated by non-catalytic methane pyrolysis in a tubular flow reactor T02-P01 University of Alberta Publication 2024-11-08 Arash Naseri, Ehsan Abbasi Atibeh,
" Kiasadegh, M
" ,
Shen, J. ,
Secanell, M. ,
Semagina, N. ,
Olfert, J. T02-P01
