Cactus-like NC/Co<sub>x</sub>P electrode enables efficient and stable hydrogen evolution for saline water splitting

CHEN Xu; ZHAO Jin-yu; ZHANG Wen-sheng; WANG Xiao-min

doi:10.1016/S1872-5805(24)60824-3

Volume 39 Issue 1

Feb. 2024

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Article Navigation > New Carbon Mater. > 2024 > 39(1): 152-163

CHEN Xu, ZHAO Jin-yu, ZHANG Wen-sheng, WANG Xiao-min. Cactus-like NC/CoxP electrode enables efficient and stable hydrogen evolution for saline water splitting. New Carbon Mater., 2024, 39(1): 152-163. doi: 10.1016/S1872-5805(24)60824-3

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CHEN Xu, ZHAO Jin-yu, ZHANG Wen-sheng, WANG Xiao-min. Cactus-like NC/Co_xP electrode enables efficient and stable hydrogen evolution for saline water splitting. New Carbon Mater., 2024, 39(1): 152-163. doi: 10.1016/S1872-5805(24)60824-3

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Cactus-like NC/Co_xP electrode enables efficient and stable hydrogen evolution for saline water splitting

doi: 10.1016/S1872-5805(24)60824-3

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

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Author Bio:
陈　续，博士. E-mail：874998005@qq.com
Corresponding author: WANG Xian-min, Professor. E-mail: wangxiaomin@tyut.edu.cn
Received Date: 2023-08-01
Rev Recd Date: 2023-10-30

Available Online: 2023-11-20

Publish Date: 2024-02-01

Abstract

Abstract

Designing efficient and robust catalysts for hydrogen evolution reaction (HER) is imperative for saline water electrolysis technology. A catalyst composed of Co_xP nanowires array with N-doped carbon nanosheets (NC) was fabricated on Ni foam (NF) by an in-situ growth strategy. The material is designated as NC/Co_xP@NF. In the preparation process, Co(OH)₂ nanowires were transformed into a metal organic framework of cobalt (ZIF-67) on NF by the dissolution-coordination of endogenous Co²⁺ and 2-methylimidazole. The resulting cactus-like microstructure gives NC/Co_xP@NF abundant exposed active sites and ion transport channels, which improve the HER catalytic reaction kinetics. Furthermore, the interconnected alternating nanowires and free-standing nanosheets in NC/Co_xP@NF improve its structural stability, and the formation of surface polyanions (phosphate) and a NC nanosheet protective layer improve the anti-corrosive properties of catalysts. Thus, the NC/Co_xP@NF has an excellent performance, requiring overpotentials of 107 and 133 mV for HER to achieve 10 mA cm⁻² in 1.0 mol L⁻¹ KOH and 1.0 mol L⁻¹ KOH + 0.5 mol L⁻¹ NaCl, respectively. This in-situ transformation strategy is a new way of constructing highly-efficient HER catalysts for saline water electrolysis.
- Hydrogen evolution reaction,
- Nanoarchitecture,
- Transition metal phosphide,
- Chlorine-corrosion resistance,
- Saline water splitting

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References(47)

References

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