CuCo2O4/NiFe层状双金属氢氧化物核壳纳米花球阵列的高效析氧反应
Efficient oxygen evolution reaction of CuCo2O4/NiFe-layered bimetallic hydroxide core-shell nanoflower sphere arrays
杨恩东 1田浩泽 2张珂 2娄永兵2
作者信息
- 1. 上海亿金电子技术有限公司,上海 200120;南通江海储能技术有限公司,南通 226399
- 2. 东南大学化学化工学院,南京 211189
- 折叠
摘要
采用界面T程策略在泡沫镍(NF)上制备了 CuCo2O4/NiFe层状双金属氢氧化物(LDH)(CuCo2O4/NiFe-LDH@NF)核壳纳米花球阵列.研究表明,电子通过CuCo2O4和NiFe-LDH耦合界面发生转移,导致核心CuCo2O4处于富电子状态,从而提高了反应速率.非晶态NiFe-LDH外壳不仅为电子/物质提供更多的传输通道和增加活性位点.同时,还能在电催化析氧反应(OER)中保护核心CuCo2O4免受强碱腐蚀.因此,在1.0 mol·L-1 KOH溶液中,将CuCo2O4/NiFe-LDH@NF用作OER催化剂时,仅需191 mV的低过电位即可实现10 mA·cm-2的电流密度和31 mV·dec-1的低Tafel斜率.此外,CuCo2O4/NiFe-LDH@NF在长时间的工作中能够保证催化性能、晶体结构、形貌结构和组成的稳定.
Abstract
Using an interface engineering strategy,we successfully synthesized a core-shell nano-flower array of CuCo2O4/NiFe-layered bimetallic hydroxide(LDH)on nickel foam(NF)(CuCo2O4/NiFe-LDH@NF).The research indicates that electrons undergo transfer across the coupled interface of CuCo2O4 and NiFe-LDH,resulting in the enrichment of the CuCo2O4 core in electron density and thereby enhancing reaction kinetics.The amorphous NiFe-LDH shell not only provides additional channels for electron/material transport and increases active sites but also effectively shields the core CuCo2O4 from strong alkali corrosion during the oxygen evolution reaction(OER)in elec-trocatalysis.Therefore,when employed as an OER catalyst in a 1.0 mol·L-1 KOH solution,CuCo2O4/NiFe-LDH@NF required only a low overpotential of 191 mV to achieve a current density of 10 mA·cm-2 and a low Tafel slope of 31 mV·dec-1.Furthermore,CuCo2O4/NiFe-LDH@NF demonstrated stability in catalytic performance,crystal structure,morphological structure,and composition during prolonged operation.
关键词
界面工程/过渡金属氧化物/镍铁氢氧化物/析氧反应/核壳结构Key words
interfacial engineering/transition metal oxide/nickel-iron hydroxide/oxygen evolution reaction/core-shell structure引用本文复制引用
基金项目
江苏省重点研发计划项目(BE2022767)
出版年
2024
NETL
NSTL
万方数据