Spontaneously separated intermetallic Co3Mo from nanoporous copper as versatile electrocatalysts for highly efficient water splitting

Hang Shi, Yi-Tong Zhou, Rui-Qi Yao, Wu-Bin Wan, Xin Ge, Wei Zhang, Zi Wen, Xing-You Lang (), Wei-Tao Zheng and Qing Jiang ()
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Hang Shi: Jilin University
Yi-Tong Zhou: Jilin University
Rui-Qi Yao: Jilin University
Wu-Bin Wan: Jilin University
Xin Ge: Jilin University
Wei Zhang: Jilin University
Zi Wen: Jilin University
Xing-You Lang: Jilin University
Wei-Tao Zheng: Jilin University
Qing Jiang: Jilin University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Developing robust nonprecious electrocatalysts towards hydrogen/oxygen evolution reactions is crucial for widespread use of electrochemical water splitting in hydrogen production. Here, we report that intermetallic Co3Mo spontaneously separated from hierarchical nanoporous copper skeleton shows genuine potential as highly efficient electrocatalysts for alkaline hydrogen/oxygen evolution reactions in virtue of in-situ hydroxylation and electro-oxidation, respectively. The hydroxylated intermetallic Co3Mo has an optimal hydrogen-binding energy to facilitate adsorption/desorption of hydrogen intermediates for hydrogen molecules. Associated with high electron/ion transport of bicontinuous nanoporous skeleton, nanoporous copper supported Co3Mo electrodes exhibit impressive hydrogen evolution reaction catalysis, with negligible onset overpotential and low Tafel slope (~40 mV dec−1) in 1 M KOH, realizing current density of −400 mA cm−2 at overpotential of as low as 96 mV. When coupled to its electro-oxidized derivative that mediates efficiently oxygen evolution reaction, their alkaline electrolyzer operates with a superior overall water-splitting output, outperforming the one assembled with noble-metal-based catalysts.

Date: 2020
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DOI: 10.1038/s41467-020-16769-6

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