Oxygen vacancies enhanced electrocatalytic water splitting of P-FeMoO4 initiated via phosphorus doping

被引:10
作者
Zhang, Weilu [1 ]
Liu, Qingcui [1 ]
Cheng, Wenhua [1 ]
Wang, Wei [1 ]
Ding, Juan [1 ]
Huang, Yudai [1 ]
机构
[1] Xinjiang Univ, Coll Chem, State Key Lab Chem & Utilizat Carbon Based Energy, Urumqi 830017, Xinjiang, Peoples R China
基金
中国国家自然科学基金;
关键词
Phosphorus doping; Oxygen vacancies; Electrocatalyst; Oxygen evolution reaction; Hydrogen evolution reaction; NANOPARTICLES EXPERIMENTAL-DESIGN; CARBON-PASTE ELECTRODE; PHOTOCATALYTIC ACTIVITY; OXIDATION; EFFICIENT; ARRAY;
D O I
10.1016/j.jcis.2024.01.067
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Transition metal oxides (TMOs) are abundant and cost-effective materials. However, poor conductivity and low intrinsic activity limit their application in electrolyzed water catalysts. Herein, we prepared P-FeMoO4 in situ on nickel foam (P-FMO@NF) by phosphorylation-modified FeMoO4 to optimize its electrocatalytic properties. Interestingly, phosphorus doping is accompanied by the generation of oxygen vacancies and surface phosphates. Oxygen vacancies accelerated Mo dissolution during the oxygen evolution reaction (OER), leading to the rapid reconfiguration of P-FMO@NF to FeOOH and regulating the electronic structure of P-FMO@NF. The formation of phosphates is caused by the substitution of some molybdates with phosphates, which further increases the amount of oxygen vacancies. Hence, the OER overpotential of P-FMO@NF at a current density of 10 mA cm -2 is only 206 mV, and the hydrogen evolution reaction (HER) overpotential is 154 mV. It was assembled into a water splitting cell with a voltage of just 1.59 V at 10 mA cm -2 and shows excellent stability over 50 h. These excellent electrocatalytic properties are mainly attributed to the oxygen vacancies, which improve the interfacial charge transfer properties of the catalysts. This study provides new insights into phosphorus doping and offers a new perspective on the design of electrocatalysts.
引用
收藏
页码:114 / 123
页数:10
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