The influence of heat treatment on microstructure and hydrogen evolution properties of electrodeposited Ni-S alloy
Water-eletrolytic hydrogen production is the most promising technology to replace the hydro-gen production from fossil fuel,the hydrogen evolution electrode with low cost and high efficiency is the bottleneck problem limiting the large-scale application of water electrolysis for hydrogen produc-tion,Ni-S alloy exhibits the great potential as a cathode material for water electrolysis due to its easy preparation and high activity.Herein,the amorphous Ni-S alloy coating was prepared on the surface of nickel foam via electrodeposition,and the influence of crystallization behavior on the hydrogen evolu-tion activity of Ni-S alloy was investigated in this work.Heat treatment promoted the recrystallization of the amorphous Ni-S alloy coating into crystalline layer mainly composed of Ni3S2 and Ni phases,the electrochemical analysis revealed that heat treatment reduced the number of active sites on the amorphous Ni-S alloy coating for hydrogen evolution reaction,and increased the difficulty of hydrogen desorption from the surface of the Ni-S alloy,thus,the electrochemical hydrogen evolution performance of the Ni-S/NF electrode was significantly weakened.
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