期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 48, 期 15, 页码 5774-5782出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.11.118
关键词
Nickel-iron; Oxygen evolution reaction; Partially crystallized hydroxide; Sol-gel method
A NiFe0.5(OH)(x) catalyst with partially crystallized nickel-iron oxyhydroxides exhibits superior OER performance, with low OER overpotential and good durability. The energy barrier of NiFe0.5(OH)(x) is smaller than those of Ni(OH)(x) and Fe(OH)(x), indicating its efficient catalytic activity for the formation of *OOH intermediate in the OER.
The slow oxygen evolution reaction (OER) kinetics influences hydrogen production efficiency from water splitting. To break through the bottleneck of water splitting, it is urgent to develop efficient and economic electrocatalysts. Although NiFe-based catalysts exhibit outstanding OER activity, the complicated preparation process limits their large-scale synthesis and applications. Here, partially crystallized nickel-iron oxyhydroxides are synthesized by a facile sol-gel method. When the Fe/Ni mole ratio is 0.5:1, the NiFe0.5(OH)(x) catalyst shows superior OER performance with a low OER overpotential of 265 mV and good durability. Kinetic studies show that the energy barrier of NiFe0.5(OH)(x) is only 31.5 kJ mol(-1), much smaller than those of Ni(OH)(x) (41.0 kJ mol(-1)) and Fe(OH)(x) (44.8 kJ mol(-1)). The synergistic action between Ni and Fe sites not only facilitates mass and charge transfer, but also promotes the formation of *OOH intermediate for the OER. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据