Regulating Water-Reduction Kinetics in Cobalt Phosphide for Enhancing HER Catalytic Activity in Alkaline Solution

Advanced Materials
Kun XuYi Xie

Abstract

Electrochemical water splitting to produce hydrogen renders a promising pathway for renewable energy storage. Considering limited electrocatalysts have good oxygen-evolution reaction (OER) catalytic activity in acid solution while numerous economical materials show excellent OER catalytic performance in alkaline solution, developing new strategies that enhance the alkaline hydrogen-evolution reaction (HER) catalytic activity of cost-effective catalysts is highly desirable for achieving highly efficient overall water splitting. Herein, it is demonstrated that synergistic regulation of water dissociation and optimization of hydrogen adsorption free energy on electrocatalysts can significantly promote alkaline HER catalysis. Using oxygen-incorporated Co2 P as an example, the synergistic effect brings about 15-fold enhancement of alkaline HER activity. Theory calculations confirm that the water dissociation free energy of Co2 P decreases significantly after oxygen incorporation, and the hydrogen adsorption free energy can also be optimized simultaneously. The finding suggests the powerful effectiveness of synergetic regulation of water dissociation and optimization of hydrogen adsorption free energy on electrocatalysts for alkaline...Continue Reading

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Citations

May 24, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhaomei SunBo Tang
Jul 13, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Furong YuWeidong Shi
Jan 21, 2020·Advanced Materials·Nasir UddinZongyou Yin
Jan 18, 2018·Chemical Communications : Chem Comm·Xiaoping ZhangFengli Qu
Jun 14, 2021·Journal of Colloid and Interface Science·Beibei YangBaohong Liu
Jun 28, 2019·ACS Applied Materials & Interfaces·Nan LiXia Tao
Apr 25, 2019·Journal of the American Chemical Society·Xingxing YuShu-Hong Yu

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