期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 622, 期 -, 页码 443-451出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.04.129
关键词
Multimetallic oxides; Oxygen evolution reaction; Water oxidation; NiFeMoOx ; Electrocatalyst
资金
- National Natural Science Foundation of China [21775055, 22074053, 21874055]
- Excellent Youth Innovation Team in Universities of Shandong [2019KJC016]
- The Project of 20 items of University of Jinan [2018GXRC001]
- Shandong Provincial Natural Science Foundation [ZR2019BB025]
- The Taishan Scholars program and Case-by-Case Project for Top Outstanding Talents of Jinan
NiFeMoOx nanosheets with high-performance OER activity were prepared by promoting the oxidation cycle process in NiFe oxyhydroxide through high-valence Mo doping. The resulting nanosheets exhibited outstanding alkaline OER activity and long-term stability.
Engineering of robust nonprecious electrocatalysts toward anodic oxygen evolution reaction (OER) is of great significance for lowering the cost and energy consumption for renewable fuel production. Herein, we report NiFeMoOx nanosheets as high-performance OER electrocatalyst through promoting the thermodynamic-limiting oxidation cycle process in NiFe oxyhydroxide via high-valence Mo doping. The NiFeMoOx nanosheets are prepared by an elaborate in-situ solvothermal etching-depositing process with NiFe alloy framework as substrate and metal precursors. The resultant nanosheets exhibit outstanding alkaline OER activity, requires only 235/282/327 mV overpotentials to achieve current density of 10/100/300 mA cm(-2), respectively, with a good long-term stability at 20 mA cm(-2) for 72 h. Besides, the Tafel slope low to 28.1 mV dec(-1) indicates a favorable OER kinetics. The superior catalytic activity of NiFeMoOx nanosheets should be attributed to the lower oxidation states of Ni and Fe induced by high-valence dopant, leading to easier surface reconstruction at low charge oxidation cycling during OER, thereby effectively reducing the overpotential. The synergy between the electronic effect among multimetallic sites and the unique morphology is expected to inspire the development of robust OER electrocatalyst for industrial application. (C)& nbsp;2022 Elsevier Inc. All rights reserved.
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