Corrosion-resistant cobalt phosphide electrocatalysts for salinity tolerance hydrogen evolution

Xinwu Xu, Yang Lu, Junqin Shi (), Xiaoyu Hao, Zelin Ma, Ke Yang, Tianyi Zhang, Chan Li, Dina Zhang, Xiaolei Huang () and Yibo He ()
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Xinwu Xu: Northwestern Polytechnical University
Yang Lu: Northwestern Polytechnical University
Junqin Shi: Northwestern Polytechnical University
Xiaoyu Hao: Northwestern Polytechnical University
Zelin Ma: Northwestern Polytechnical University
Ke Yang: Northwestern Polytechnical University
Tianyi Zhang: Northwestern Polytechnical University
Chan Li: Northwestern Polytechnical University
Dina Zhang: Northwestern Polytechnical University
Xiaolei Huang: Chinese Academy of Sciences
Yibo He: Northwestern Polytechnical University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Seawater electrolysis is a viable method for producing hydrogen on a large scale and low-cost. However, the catalyst activity during the seawater splitting process will dramatically degrade as salt concentrations increasing. Herein, CoP is discovered that could reject chloride ions far from catalyst in electrolyte based on molecular dynamic simulation. Thus, a binder-free electrode is designed and constructed by in-situ growth of homogeneous CoP on rGO nanosheets wrapped around the surface of Ti fiber felt for seawater splitting. As expected, the as-obtained CoP/rGO@Ti electrode exhibits good catalytic activity and stability in alkaline electrolyte. Especially, benefitting from the highly effective repulsive Cl− intrinsic characteristic of CoP, the catalyst maintains good catalytic performance with saturated salt concentration, and the overpotential increasing is less than 28 mV at 10 mA cm−2 from 0 M to saturated NaCl in electrolyte. Furthermore, the catalyst for seawater splitting performs superior corrosion-resistance with a low solubility of 0.04%. This work sheds fresh light into the development of efficient HER catalysts for salinity tolerance hydrogen evolution.

Date: 2023
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DOI: 10.1038/s41467-023-43459-w

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