Interface engineering of porous Fe2P-WO2.92 catalyst with oxygen vacancies for highly active and stable large-current oxygen evolution and overall water splitting

被引:58
作者
Peng, Qimin [1 ]
He, Qiuting [1 ]
Hu, Yan [1 ]
Isimjan, Tayirjan Taylor [2 ]
Hou, Ruobing [1 ]
Yang, Xiulin [1 ]
机构
[1] Guangxi Normal Univ, Sch Chem & Pharmaceut Sci, Guangxi Key Lab Low Carbon Energy Mat, Guilin 541004, Guangxi, Peoples R China
[2] King Abdullah Univ Sci & Technol KAUST, Saudi Arabia Basic Ind Corp SABIC, Thuwal 239556900, Saudi Arabia
来源
JOURNAL OF ENERGY CHEMISTRY | 2022年 / 65卷
基金
中国国家自然科学基金;
关键词
Fe2P-WO2.92; Interface engineering; Oxygen vacancy; Oxygen evolution; Overall water splitting; ELECTRONIC-STRUCTURE; NI FOAM; EFFICIENT; ELECTROCATALYSTS; ARRAYS; OXIDE; COP;
D O I
10.1016/j.jechem.2021.06.037
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Constructing a low cost, and high-efficiency oxygen evolution reaction (OER) electrocatalyst is of great significance for improving the performance of alkaline electrolyzer, which is still suffering from high-energy consumption. Herein, we created a porous iron phosphide and tungsten oxide self-supporting electrocatalyst with oxygen-containing vacancies on foam nickel (Fe2P-WO2.92/NF) through a facile insitu growth, etching and phosphating strategies. The sequence-controllable strategy will not only generate oxygen vacancies and improve the charge transfer between Fe2P and WO2.92 components, but also improve the catalyst porosity and expose more active sites. Electrochemical studies illustrate that the Fe2P-WO2.92/NF catalyst presents good OER activity with a low overpotential of 267 mV at 100 mA cm(-2), a small Tafel slope of 46.3 mV dec(-1), high electrical conductivity, and reliable stability at high current density (100 mA cm(-2) for over 60 h in 1.0 M KOH solution). Most significantly, the operating cell voltage of Fe2P-WO2.92/NF parallel to Pt/C is as low as 1.90 V at 400 mA cm(-2) in alkaline condition, which is one of the lowest reported in the literature. The electrocatalytic mechanism shows that the oxygen vacancies and the synergy between Fe2P and WO2.92 can adjust the electronic structure and provide more reaction sites, thereby synergistically increasing OER activity. This work provides a feasible strategy to fabricate high-efficiency and stable non-noble metal OER electrocatalysts on the engineering interface. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
引用
收藏
页码:574 / 582
页数:9
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