Ag掺杂NiFe层状双氢氧化物应用于电催化析氢研究

摘要/Abstract

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。

关键词: 层状双氢氧化物, 镍铁, 银, 掺杂, 电催化, 析氢反应

Abstract: 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.

Key words: layered double hydroxide, NiFe, Ag, doping, electrocatalysis, hydrogen evolution reaction

中图分类号:

O643.36

孙冠军, 李建保, 王敏, 陈拥军, 骆丽杰. Ag掺杂NiFe层状双氢氧化物应用于电催化析氢研究[J]. 硅酸盐通报, 2023, 42(8): 2960-2967.

SUN Guanjun, LI Jianbao, WANG Min, CHEN Yongjun, LUO Lijie. Application of Ag Doped NiFe Layered Double Hydroxides in Electrocatalytic Hydrogen Evolution[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2960-2967.

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