Ag掺杂NiFe层状双氢氧化物应用于电催化析氢研究  

Application of Ag Doped NiFe Layered Double Hydroxides in Electrocatalytic Hydrogen Evolution

作　　者：孙冠军 李建保[1] 王敏[1] 陈拥军[1] 骆丽杰[1] SUN Guanjun;LI Jianbao;WANG Min;CHEN Yongjun;LUO Lijie(State Key Laboratory of Marine Resource Utilization in South China Sea,School of Materials Science and Engineering,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学材料科学与工程学院,南海海洋资源利用国家重点实验室,海口570228

出　　处：《硅酸盐通报》2023年第8期2960-2967,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52172086)。

摘　　要：开发廉价高效的催化剂是发展电解水产业的关键。层状双氢氧化物(LDH)在电催化析氧反应中表现出优异的性能,但这类催化剂在析氢反应中表现出的电化学性能并不好。本文通过将Ag元素掺杂在NiFe-LDH纳米片阵列中,获得了优异的析氢性能。结果表明,在1 mol/L KOH溶液中,电流密度达到10 mA·cm^(-2)所需的过电位仅为73 mV,且塔菲尔斜率为61.3 mV·dacade^(-1)。在800 mA·cm^(-2)的大电流密度下过电位仅为493 mV,明显低于商用铂碳催化剂。在长达30 h稳定性测试后仍保持90%以上电化学性能。催化性能的改善归因于Ag掺杂NiFe-LDH使纳米片尺寸减小和比表面积增加,有效提升产氢动力学并改善电子传输,从而优化NiFe-LDH的电催化析氢性能。Developing cheap and efficient catalysts is the key to develop electrolytic water industry.Layered double hydroxides(LDH)exhibit excellent performance in electrocatalytic oxygen evolution reactions,but these catalysts exhibit poor electrochemical performance in hydrogen evolution reactions.Excellent hydrogen evolution performance was achieved by doping Ag element into NiFe-LDH nanosheet arrays.The results show that in 1 mol/L KOH solution,the required overpotential for a current density of 10 mA·cm^(-2)is only 73 mV,and the Tafel slope is 61.3 mV·dacade^(-1).At a high current density of 800 mA·cm^(-2),the overpotential is only 493 mV,which is significantly lower than that of commercial platinum carbon catalysts.After 30 h of stability testing,the electrochemical performance remains above 90%.The improvement in catalytic performance is attributed to the reduction in nanosheet size and increase in specific surface area caused by Ag doping with NiFe-LDH,which effectively enhances hydrogen production kinetics and improves electron transport,thereby optimizing the electrocatalytic hydrogen evolution performance of NiFe-LDH.

关 键 词：层状双氢氧化物 镍铁 银 掺杂 电催化 析氢反应 

分 类 号：O643.36[理学—物理化学]