摘要
采用简单、可控的阳离子交换法和水热法在导电基底上成功构筑了具有自支撑纳米片阵列结构的Co_(9)S_(8)/Ni_(3)S_(2)电催化剂,在碱性电解液(1 mol/L KOH)中,采用三电极体系分别研究了Co_(9)S_(8)/Ni_(3)S_(2)的电催化析氧和析氢性能。在析氧性能测试中,Co_(9)S_(8)/Ni_(3)S_(2)/NF电催化剂获取50、100 mA/cm^(2)的催化电流密度所需要的过电位仅为230、280 mV。而在析氢性能测试中,Co_(9)S_(8)/Ni_(3)S_(2)/NF电催化剂获取-100 mA/cm^(2)的催化析氢电流密度所需的过电位仅为129 mV,同时该催化剂表现出了优异的电催化稳定性,其优异的电催化性能归因于其自支撑纳米片阵列结构,可提供更多的活性位点。
The combination of cation exchange and hydrothermal method was used to fabricate Co_(9)S_(8)/Ni_(3)S_(2) nanosheet arrays in-situ grown on nickel foam.1 mol/L KOH solution was used as the electrolyte,in a three-electrode system,the electrocatalytic performances towards hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)were investigated.As for OER,the overpotentials of Co_(9)S_(8)/Ni_(3)S_(2)/NF to acquire the current densities of 50 and 100 mA/cm^(2) were only 230 and 280 mV,respectively.And in HER,the overpotential at-100 mA/cm^(2) was as low as 129 mV.Furthermore,this electrode showed remarkable durability in both reactions.The excellent electrocatalytic performance of Co_(9)S_(8)/Ni_(3)S_(2)/NF was attributed to the free-standing architecture as well as the nanosheet array structure,which can expose more active sites.
作者
覃彪
郭芬岈
黎挺挺
QIN Biao;GUO Fen-ya;LI Ting-ting(College of Chemistry and Chemical Engineering,Zunyi Normal University,Zunyi 563006,China;School of Material Science and Chemical Engineering,Ningbo University,Ningbo 315211,China)
出处
《化学试剂》
CAS
北大核心
2021年第11期1480-1485,共6页
Chemical Reagents
基金
贵州省科技厅基础研究项目(黔科合基础【2017】1199)。
