塔菲尔方程
析氧
过电位
电催化剂
材料科学
催化作用
镍
氢氧化物
化学工程
钒
交换电流密度
电解质
无机化学
电化学
化学
电极
物理化学
冶金
生物化学
工程类
作者
Yaoyao Deng,Yidong Lu,Rentong Dai,Mei Xiang,Zhenwei Zhang,Xiaoli Zhang,Pin Zhou,Hongwei Gu,Jirong Bai
标识
DOI:10.1016/j.jcis.2022.07.060
摘要
Exploring highly active and inexpensive electrocatalysts for oxygen evolution reaction (OER) is considered to be one of the preconditions for the development of energy and environment-related technologies. Nickel-based layered double hydroxides (LDHs) are extensively-studied OER electrocatalysts, but they still require relatively high overpotentials to achieve threshold current densities. In this work, iron-doped nickel-vanadium hydroxide microspheres (Fe-doped NiV HMS) were synthesized by doping iron ions into the NiV HMS through a facile cation-exchange method. The Fe-doped NiV HMS are hollow hierarchical structure stacked by high-density perpendicularly-lying nanosheets, which provide enough space for electrolyte penetration and diffusion. Owing to optimized composition and hollow hierarchical structure, the Fe-doped NiV HMS exhibits excellent electrocatalytic performance, which possessed a very low running overpotential (255 mV at 10 mA cm-2) and a smallest Tafel slope (56 mV dec-1) compared with hierarchical NiV HMS toward OER. Electrochemical results and density functional theory (DFT) manifest that Fe doping could regulate the electronic structure of NiV HMS, thus improving its electrical conductivity and electron transfer rate, and thus enhancing its catalytic activity. This research provides a convenient way to prepare Ni-based hydroxides as promising OER catalysts.
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