Br-induced P-poor defective nickel phosphide for highly efficient overall water splitting

Tianyi Xu ¹Dongxu Jiao ²Lei Zhang³

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作者信息

1. State Key Laboratory of Automotive Simulation and Control, School of Materials Science and Engineering, Key Laboratory of Automobile Materials of MOE, Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Electron Microscopy Center, Jilin University, Changchun 130012, China
2. Key Laboratory of Photonic and Electronic Bandgap Materials, Ministry of Education, and College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, China
3. College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
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Abstract

Development of efficient electrocatalysts requires construction of catalytic surfaces with moderate H adsorption energy. Here, we address this challenge by Br-induced formation of P-poor defective nickel phosphide and show that the H adsorption energy can be optimized by regulating the vacancy concentration. We show that when such defective Ni_(12)P_(5-x)Br_x nanoparticles are distributed on the surface of Ni2P nanosheets (Ni_(12)P_(5-x)B_rx/Ni2P NS), excellent catalytic activity for water splitting is obtained in alkaline media. Density functional theory computations revealed that Br doping induce the formation of a P-poor nickel phosphide with vacancies, leading to an optimal H adsorption strength with a volcano-type relationship. This is the best reported for a non-precious metal phosphide at present: the overpotential for HER is 18 mV at 10 mA cm~(-2) and 155 mV for OER. This leads to an exceptionally low cell voltage requirement of only 1.44 V to drive overall water splitting in an alkaline electrolyzer.

Key words

Electrocatalyst/Overall water splitting/Br-induced/P-poor defective/Optimization of hydrogen adsorption

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量35

参考文献量64

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