纳米片状CuCo2O4的合成及析氧性能研究
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摘要：
调控催化剂形貌和结构,优化表面特性,是提高催化性能的重要策略.通过水热合成铜钴双氢氧化物(CuCo LDH)前驱体,再经高温热解制得交叉连接片状CuCo2O4催化剂.该催化剂的粗糙表面和片层间隙有利于电解质的充分扩散吸附;其表面O缺陷能调节相邻金属位点价态,并能提高导电性,适合用于电化学催化.优化元素组成所制备CuCo2O4-1具有良好碱性析氧反应(OER)催化活性,在1 mol·L-1KOH电解质中,电流密度为100 mA·cm-2时的过电位(η)为362 mV,OER塔菲尔斜率为112.2 mV·dec-1,经过50 h的计时电位测试,η保持稳定,也显示出良好催化稳定性。为碱性OER电催化剂的设计提供了可行方案.
The manipulation of morphology and structure,as well as the optimization of surface characteristics of catalyst are significant tacticses to enhance the catalytic performance.In this work,CuCo2O4catalyst with cross connected nanoflakes structure was prepared by one-step hydrothermal synthesis of copper cobalt bimetallic hydroxide precursor(CuCo LDH)followed by high temperature pyrolysis treatment.The rough surface and the inter-flake voids within the as-prepared catalyst facilitate the sufficient diffusion and adsorption of electrolyte,meanwhile,the superficial O vacancies can regulate the valences of adjacent metal sites and increase the conductivity,these surface features are conducive to electrocatalytic feature.The typical CuCo2O4-1 with optimal elemental composition owns good catalytic activity for alkali oxygen evolution reaction(OER).In 1 mol·L-1KOH electrolyte,the overpotential(η)achieved at 362 mV to arise response current density of 100 mA·cm-2,and demonstrated Tafel slope of 112.2 mV·dec-1.In addition,theηmaintained unvaried upon 50 h of chronopotentiometry test,showing the fine catalytic stability.The current work provides a feasible solution to design efficient catalyst for alkali OER.
作者：
高志永 胡战强
Gao Zhiyong;Hu Zhanqiang(School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China)
机构地区：
河南师范大学化学化工学院
出处：
《河南师范大学学报(自然科学版)》 CAS 2024年第1期34-41,F0002,共9页
Journal of Henan Normal University(Natural Science Edition)
基金：
国家自然科学基金(51802084) 河南省自然科学基金(212300410363) 河南省高校基础研究专项(20ZX005).
关键词：
双金属氧化物 析氧反应 电催化 电解水
bimetallic oxide oxygen evolution reaction electrocatalytic water electrolysis
分类号：
O643.36 [理学—物理化学]
