纳米片
析氧
氢氧化物
材料科学
晶界
催化作用
化学工程
电极
金属氢氧化物
粒度
纳米技术
电化学
无机化学
冶金
化学
微观结构
物理化学
生物化学
工程类
作者
Jiang Du,Hong Zhang,Wei Hu,Zelong Li,Wensheng Gao,Xiaomei Wang,Can Li
出处
期刊:Small
[Wiley]
日期:2023-07-21
卷期号:19 (47)
被引量:5
标识
DOI:10.1002/smll.202304245
摘要
The robust and scalable oxygen evolution electrocatalysts that can deliver high current densities at low applied potential is a great challenge for the large-scale industrial application in hydrogen production. Here, the preparation of a grain-boundary-rich Ni-Fe (oxy)hydroxide catalyst on Ni foam is reported using a scalable coating approach followed by a chemical precipitating treatment. This facile method effectively assembles the hierarchical Ni-Fe (oxy)hydroxide nanosheet in the ultrasmall crystalline domains (<4 nm) with rich grain boundaries. The hierarchical nanosheet structure with the grain boundaries provides more accessible catalytic sites, facile charge, and mass transfer. Benefiting from the abundant grain boundaries in the hierarchical nanosheets, the as-prepared Ni-Fe (oxy)hydroxide electrodes deliver current densities of 500 and 1000 mA cm-2 at overpotentials of only 278 and 296 mV for the oxygen evolution reaction. The prepared electrode also exhibits long-term durability at a high current density in alkaline conditions.
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