Hierarchical architectures of mesoporous Pd on highly ordered TiO₂ nanotube arrays for electrochemical CO₂ reduction
Date
2020
Authors
Zou, J.
Iqbal, M.
Vijayakumar, A.
Wang, C.
Macfarlane, D.R.
Yamauchi, Y.
Lee, C.-Y.
Wallace, G.G.
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Journal article
Citation
Journal of Materials Chemistry A, 2020; 8(16):8041-8048
Statement of Responsibility
Jinshuo Zou, Muhammad Iqbal, Amruthalakshmi Vijayakumar, Caiyun Wang, Douglas R. Macfarlane, Yusuke Yamauchi, Chong-Yong Lee, and Gordon G. Wallace
Conference Name
Abstract
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-toformate 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.
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© The Royal Society of Chemistry 2020