Research Article

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2018, 11(4): 2024–2033

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https://doi.org/10.1007/s12274-017-1818-6

Self-supported CoMoS4 nanosheet array as an efficient catalyst for hydrogen evolution reaction at neutral pH

Xiang Ren1,§, Dan Wu1,§, Ruixiang Ge2, Xu Sun1, Hongmin Ma1, Tao Yan3, Yong Zhang1, Bin Du3, Qin Wei1 (*), and Liang Chen2 (*)

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1 Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
2 Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
3 School of Resources and Environment, University of Jinan, Jinan 250022, China
§ Xiang Ren and Dan Wu contributed equally to this work.

Keywords: CoMoS4 nanosheet array, hydrogen evolution reaction, anion exchange reaction, neutral pH, density functional theory
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ABSTRACT Development of earth-abundant electrocatalysts, particularly for high-efficiency hydrogen evolution reaction (HER) under benign conditions, is highly desired, but still remains a serious challenge. Herein, we report a high-performance amorphous CoMoS4 nanosheet array on carbon cloth (CoMoS4 NS/CC), prepared by hydrothermal treatment of a Co(OH)F nanosheet array on a carbon cloth (Co(OH)F NS/CC) in (NH4)2MoS4 solution. As a three-dimensional HER electrode, CoMoS4 NS/CC exhibits remarkable activity in 1.0 M phosphate buffer saline (pH 7), only requiring an overpotential of 183 mV to drive a geometrical current density of 10 mA·cm–2. This overpotential is 140 mV lower than that for Co(OH)F NS/CC. Notably, this electrode also shows outstanding electrochemical durability and nearly 100% Faradaic efficiency. Density functional theory calculations suggest that CoMoS4 has a more favorable hydrogen adsorption free energy than Co(OH)F.
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Self-supported CoMoS4 nanosheet array as an efficient catalyst for hydrogen evolution reaction at neutral pH. Nano Res. 2018, 11(4): 2024–2033 https://doi.org/10.1007/s12274-017-1818-6

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