析氧
过电位
塔菲尔方程
氢氧化物
层状双氢氧化物
材料科学
镍
催化作用
化学工程
电解质
纳米结构
分解水
无机化学
电化学
纳米技术
化学
电极
冶金
有机化学
物理化学
光催化
工程类
作者
Le Yu,Jing Yang,Buyuan Guan,Yan Lü,Xiong Wen David Lou
标识
DOI:10.1002/anie.201710877
摘要
Abstract The oxygen evolution reaction (OER) is involved in various renewable energy systems, such as water‐splitting cells and metal–air batteries. Ni‐Fe layered double hydroxides (LDHs) have been reported as promising OER electrocatalysts in alkaline electrolytes. The rational design of advanced nanostructures for Ni‐Fe LDHs is highly desirable to optimize their electrocatalytic performance. Herein, we report a facile self‐templated strategy for the synthesis of novel hierarchical hollow nanoprisms composed of ultrathin Ni‐Fe LDH nanosheets. Tetragonal nanoprisms of nickel precursors were first synthesized as the self‐sacrificing template. Afterwards, these Ni precursors were consumed during the hydrolysis of iron(II) sulfate for the simultaneous growth of a layer of Ni‐Fe LDH nanosheets on the surface. The resultant Ni‐Fe LDH hollow prisms with large surface areas manifest high electrocatalytic activity towards the OER with low overpotential, small Tafel slope, and remarkable stability.
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