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采用脉冲电镀技术获得了高活性Ni-Mo-W析氢合金阴极。以析氢反应过电位为考察指标,确定了脉冲镀Ni-Mo-W合金的最佳电镀条件,如Na2WO4·2H2O浓度、平均电流密度和占空比等。同时,系统研究了Mo和W含量对Ni-Mo-W合金镀层成分和组成的影响规律。结果表明,在二元合金中添加W能有效提高电极的析氢反应活性(η200=80 mV);非晶态Ni-Mo-W合金的组织结构主要取决于Mo含量;与非晶态Ni-Mo合金镀层相比,Ni-Mo-W合金析氢阴极的电化学稳定性得到一定程度的提高。
High-activity Ni-Mo-W hydrogen storage alloy cathode was obtained by pulse plating technology. Taking the overpotential of hydrogen evolution reaction as the index, the optimum electroplating conditions of Ni-Mo-W alloy were determined, such as Na2WO4 · 2H2O concentration, average current density and duty ratio. At the same time, the influence of Mo and W content on the composition and composition of Ni-Mo-W alloy coating was systematically studied. The results show that the addition of W can effectively improve the hydrogen evolution reaction (η200 = 80 mV) in the binary alloy. The microstructure of the amorphous Ni-Mo-W alloy depends mainly on the content of Mo, Compared with alloy coating, the electrochemical stability of Ni-Mo-W alloy cathode for hydrogen evolution is improved to a certain extent.