Hierarchical architectures of mesoporous Pd on highly ordered TiO2 nanotube arrays for electrochemical CO2 reduction
| Autor: | Yusuke Yamauchi, Amruthalakshmi Vijayakumar, Douglas R. MacFarlane, Gordon G. Wallace, Jinshuo Zou, Chong Yong Lee, Muhammad Iqbal, Caiyun Wang |
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| Rok vydání: | 2020 |
| Předmět: |
Imagination
Materials science Chemical substance Renewable Energy Sustainability and the Environment media_common.quotation_subject Energy conversion efficiency Electrochemical kinetics Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Search engine General Materials Science 0210 nano-technology Science technology and society Mesoporous material media_common |
| Zdroj: | Journal of Materials Chemistry A. 8:8041-8048 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d0ta02077j |
| Popis: | The understanding of the influence of hierarchically nanostructured architectures as support materials for catalysts loading, is critical towards development of efficient electrocatalytic interfaces. The knowledge on mass transport limitation of reactants within such catalyst-support structures remains elusive. Herein, we performed systematic investigation through a novel hierarchical 1D–3D structure by loading mesoporous Pd with an average pore size of ∼10 nm and wall thickness of ∼4 nm onto highly ordered TiO2 nanotube arrays via pulse electrodeposition. Electrochemical CO2 reductions achieved a CO2-to-formate faradaic conversion efficiency of 88 ± 2% under optimal conditions. Importantly, the product selectivity is found to depend significantly on the tube length, highlighting the influence of mass transport limitations of CO2. This work offers vital insight into practical consideration in designing efficient catalyst-support interfaces with an optimal hierarchically geometry, that must optimise mass transport as well as electrochemical kinetics. |
| Databáze: | OpenAIRE |
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