Doping-induced structural phase transition in cobalt diselenide enables enhanced hydrogen evolution catalysis

Ya-Rong Zheng, Ping Wu, Min-Rui Gao (), Xiao-Long Zhang, Fei-Yue Gao, Huan-Xin Ju, Rui Wu, Qiang Gao, Rui You, Wei-Xin Huang, Shou-Jie Liu, Shan-Wei Hu, Junfa Zhu, Zhenyu Li and Shu-Hong Yu ()
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Ya-Rong Zheng: University of Science and Technology of China
Ping Wu: University of Science and Technology of China
Min-Rui Gao: University of Science and Technology of China
Xiao-Long Zhang: University of Science and Technology of China
Fei-Yue Gao: University of Science and Technology of China
Huan-Xin Ju: University of Science and Technology of China
Rui Wu: University of Science and Technology of China
Qiang Gao: University of Science and Technology of China
Rui You: University of Science and Technology of China
Wei-Xin Huang: University of Science and Technology of China
Shou-Jie Liu: Anhui Normal University
Shan-Wei Hu: University of Science and Technology of China
Junfa Zhu: University of Science and Technology of China
Zhenyu Li: University of Science and Technology of China
Shu-Hong Yu: University of Science and Technology of China

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Transition metal dichalcogenide materials have been explored extensively as catalysts to negotiate the hydrogen evolution reaction, but they often run at a large excess thermodynamic cost. Although activating strategies, such as defects and composition engineering, have led to remarkable activity gains, there remains the requirement for better performance that aims for real device applications. We report here a phosphorus-doping-induced phase transition from cubic to orthorhombic phases in CoSe2. It has been found that the achieved orthorhombic CoSe2 with appropriate phosphorus dopant (8 wt%) needs the lowest overpotential of 104 mV at 10 mA cm−2 in 1 M KOH, with onset potential as small as −31 mV. This catalyst demonstrates negligible activity decay after 20 h of operation. The striking catalysis performance can be attributed to the favorable electronic structure and local coordination environment created by this doping-induced structural phase transition strategy.

Date: 2018
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DOI: 10.1038/s41467-018-04954-7

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