Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 316, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121686
Keywords
Electrocatalyst; Overall water splitting; Br-induced; P-poor defective; Optimization of hydrogen adsorption
Funding
- National Natural Science Foundation of China [51872116, 12034002]
- Natural Science Funds for Distinguished Young Scholar of Heilongjiang Province [JC2018004]
- Excellent Young Foundation of Harbin Normal University [XKYQ201304]
- project for Self-innovation Capability Construction of Jilin Province Development and Reform Commission [2021C026]
- Program for JLU Science and Technology Innovative Research Team (JLUSTIRT) [2017TD-09]
- Jilin Province Science and Technology Development Program [20190201233JC]
- Fundamental Research Funds for the Central Universities
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The research team improves the catalytic activity of non-precious metal phosphides by constructing catalytic surfaces with moderate H adsorption energy through bromine doping, demonstrating the possibility of efficient water splitting in alkaline media.
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 Ni12P5-xBrx nanoparticles are distributed on the surface of Ni2P nanosheets (Ni12P5-xBrx/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.
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