以泡沫镍为基体电沉积制备了Ni-S涂层电极.通过对电流密度、电沉积温度、电沉积时间和镀液pH值等条件对涂层析氢性能影响的研究,确定了适宜的电沉积工艺条件;电极涂层的XRD、SEM测试结果表明涂层为非晶态结构、表面颗粒大小均匀且具较大表面积;电解过程中出现了Ni3S2由非晶态向晶态的转变,由于Ni3S2具有较强的吸附氢能力,是析氢反应的催化活性中心,电解过程中Ni3S2的出现降低了电极的析氢电位.模拟电解水实验结果表明泡沫镍基Ni-S涂层电极较Raney-Ni电极具有更好的析氢活性.
Ni-S coating electrode was prepared by electrodepositing on foam nickel matrix. The optimized condi-tions of electrodeposition have been determined by studying the conditions of current density, temperature,de-positing time and pH value. The results of XRD and SEM analyses show that the coating is of amorphous struc-ture and the particles in surface is uniform with large specific surface area. Amorphous Ni3S2 particle trans-formed to crystalline Ni3S2 during electrodeposition,it made the overvoltage of electrode decreased. The results of the water electrolysis experiment has been made to Ni-S coating electrodes show that Ni-S coating electrode exhibits better electrocatalytic HER activity compared to Raney-Ni during water electrolysis.
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