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

Abstract

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

CLC Number:

O643.36

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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