Journal
SCRIPTA MATERIALIA
Volume 191, Issue -, Pages 56-61Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.09.011
Keywords
Nanoporous metal; Hierarchical; Alloying; Hydrogen evolution reaction; Electrocatalysis
Categories
Funding
- National Natural Science Foundation of China [51771072, 51901076, 61805064]
- Outstanding Youth Scientist Foundation of Hunan Province [2020JJ2006]
- Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Independent Research Project [71860007]
- Natural Science Foundation of Shanghai [19ZR1419800]
- Gaoyuan Discipline of ShanghaiEnvironmental Science and Engineering (Resource Recycling Science and Engineering)
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The study focuses on a self-supported Mo-modified hierarchical nanoporous Cu as an efficient electrocatalyst for hydrogen evolution, exhibiting high HER activity and excellent durability in alkaline solution. The optimized nanoporous Cu-Mo electrocatalysts demonstrate outstanding hydrogen evolution performance in alkaline conditions.
The development of earth-abundant, non-noble, high-performance hydrogen evolution reaction (HER) electrocatalysts is still a highly challenging but vitally important issue for energy conversion system. Herein, we reported a self-supported Mo modified hierarchical nanoporous Cu as an efficient electrocatalyst for hydrogen evolution. The optimized nanoporous Cu-Mo electrocatalysts with extremely dilute Mo content exhibits a high HER activity with a negligible onset potential, a small Tafel slope, and an excellent durability in alkaline solution. The dealloying process provides nanoporous Cu-Mo electrocatalysts a unique three-dimensional interconnected bicontinuous nanoporous architecture, which can not only offer high-density catalytic active sites for HER, but also accelerate the desorption of hydrogen molecule from catalysts surface. Density functional theory (DFT) calculations reveal that the introducing of Mo into Cu matrix can accelerate water adsorption and dissociation and optimize adsorption-desorption energetics of H intermediates, thus improving the intrinsic HER activity of nanoporous Cu-Mo electrocatalysts. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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