期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 65, 期 -, 页码 118-125出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.05.069
关键词
Self-supporting; Micro/nano-porous film; High hydrophilicity; Bubble detachment; High HER (hydrogen evolution reaction) catalytic performance
资金
- National Natural Science Foundation of China [51804023, 51874020]
- Fundamental Research Funds for the Central Universities [FRF-TP-18-007A1]
- China Postdoctoral Science Foundation [2019M650489, 2019T120046]
- Taishan Scholars Program [tsqn201909087]
Efficient and stable non-precious metal HER electrocatalysts are crucial for industrial hydrogen production. The Ni3P-Co2P-(Ni-Co) film with hierarchically micro/nano-porous structure exhibited increased active sites and durability for HER, showing promising catalytic performance in both alkaline and acid solutions.
Designing efficient and stable non-precious metal HER (hydrogen evolution reaction) electrocatalysts with high large current density adaptability is significant for industrial application of hydrogen production by water electrolysis. Herein, a facile strategy was developed to construct a multi-phase Ni3P-Co2P-(Ni-Co) film with self-supporting hierarchically micro/nano-porous structure by using bubble template method electrodeposition of self-supporting micro-porous NiCoP film, oxygen-free annealing for phase separation producing Ni3P-Ni-Co2P-Co structure, and acid etching for constructing surface nano-porous structure. The effective active sites for HER was significantly increased due to the hierarchically micro/nano-porous structure, which not only enlarged the surface roughness, but enhanced the bubble detachment by improving the hydrophilicity. Meanwhile, the HER electrolysis durability was improved benefiting from the Ni3P-Co2P phases with high corrosion resistance (especially in acid solution) and the self-supporting film structure without binder. Consequently, the NiCoP-OA-AE film exhibited high HER catalytic performance, which delivered a current density of 10 mA cm(-2) at a low overpotential of 42.9 and 39.7 mV in 1 M KOH and 0.5 M H2SO4, respectively. It also possessed high long-term electrolysis durability, and the cell voltage of water electrolysis using self-supporting porous NiCoP-OA-AE parallel to IrO2-Ta2O5 electrolyzer at 500 mA cm(-2) for 250 h in 0.5 M H2SO4 is only 2.9 V. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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