期刊
JOURNAL OF POWER SOURCES
卷 524, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231068
关键词
CoNiFe-LDH; Superstructure; Oxygen evolution reaction; Hydrogen evolution reaction; Water splitting
资金
- National Natural Science Foundation of China [51772070, 51872068]
- Natural Science Foundation of Heilongjiang Province, China [TD2021E005]
This study presents the fabrication of a trimetallic CoNiFe-layered double hydroxide (LDH) catalyst with optimized intrinsic activity. The catalyst shows low overpotentials for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), demonstrating superior performance compared to other LDH catalysts. The development of this trimetallic LDH catalyst holds great potential in hydrogen production.
Developing cost-effectively bifunctional electrocatalysts with high activity sites and optimized intrinsic activity is still an enormous challenge. Here, a trimetallic CoNiFe-layered double hydroxide (LDH) hollow superstructure grown on carbon cloth is ingeniously fabricated through an aging and etching-coprecipitating method. Remarkably, electron cloud density of active sites and adsorption for reaction intermediate are optimized by the strong electronic coupling effect and the abundant oxygen vacancies, which can endow catalysts with marvelous intrinsic activity for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). As a consequence, the trimetallic CoNiFe-LDH catalyst requires low overpotentials toward HER (143 mV at 10 mA cm(-2)) and OER (219 mV at 20 mA cm(-2)) in 1.0 M KOH, enabling an alkaline electrolyzer to deliver a low cell voltage of 1.56 V at 10 mA cm(-2) that are superior to most reported LDH catalysts. This work reports a high activity bifunctional OER/HER electrocatalysts, which may open numerous opportunities to the development of trimetallic LDH catalysts in hydrogen production.
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