摘要
镍铁层状双氢氧化物(NiFeLDHs)是一种被广泛研究的优良析氧反应电催化剂。然而,它们的析氢反应(HER)和全解水性能并不令人满意。因此,通过水热法将Cd掺杂在NiFe-LDH纳米片阵列中,获得优异的HER性能,在电流密度为10 mA·cm^(-2)处碱性析氢过电位仅为111 mV,塔菲尔斜率为93.5 mV·dec^(-1)。将其用于两电极全解水体系,驱动10 mA·cm^(-2)的电流密度仅需1.621 V电压。突出的催化性能归因于Cd掺杂NiFe LDH导致Fe电子云密度升高,利于氢质子的吸附,同时Cd作为新的吸附水活性位点,从而提升电催化析氢性能。
NiFe layered double hydroxide(LDH)-based materials arouse great attention because of their outstanding catalytic activity for oxygen evolution reaction(OER)under alkaline conditions.However,their catalytic activity for hydrogen evolution reaction(HER)under alkaline conditions is not sufficiently high.Herein,Cd is used to dope NiFe-LDH nanosheet array by using hydrothermal method,to achieve high HER performance.In 1 M KOH solution,at a low overpotential of 111 mV,the current density could reach 10 mA·cm^(-2) for HER,with a low Tafel slope of 93.5 mV·dec^(−1).Simultaneously,when the NiFeCd-LDH is used as bifunctional catalysts,just a low voltage of 1.621 V is required to achieve a current density of 10 mA·cm^(-2).The outstanding catalytic performance is attributed to the increase density of Fe electron cloud,due to the Cd doping effect in NiFe LDH,which is conducive to the adsorption of protons.Meanwhile,Cd acts as a new active site for water adsorption,thus improving the performance of electrocatalytic hydrogen evolution.
作者
万伟敏
王敏
陈拥军
骆丽杰
余婉霏
张艳平
WAN Weimin;WANG Min;CHEN Yongjun;LUO Lijie;YU Wanfei;ZHANG Yanping(School of Materials Science and Engineering,State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan University,Haikou 570228,Hainan,China)
出处
《陶瓷学报》
CAS
北大核心
2023年第4期736-743,共8页
Journal of Ceramics
基金
海南省自然科学基金青年基金(522QN282)。
关键词
NiFe
LDH
CD
掺杂
电催化析氢
电催化全解水
NiFe LDH
Cd
doping
electrocatalytic hydrogen evolution
overall water splitting
