Citation: Ma Jie, Jiang Xiong, Jiang Lin-Cai, Lv Man-Qi. Hydrogen Evolution Reaction on Composite-Coated Electrodes of Ball Milling-Formed Nanocrystalline Ni-Co Alloy[J]. Acta Physico-Chimica Sinica, 1996, 12(01): 22-28. doi: 10.3866/PKU.WHXB19960106
球磨形成的Ni-Mo纳米晶复合镀层上的析氢反应
采用复合电镀的方法将不同球磨时间制备的高催化活性的纳米晶Ni－Mo合金粉直接镀于电极表面，并用稳态极化曲线及交流阻抗技术测试了这些电极析氢的电化学活性，同时用X射线行射、透射电镜及扫描电镜监测了Ni－Mo合金粉的物相结构、晶粒尺寸及复合电极表面的形貌，并初步探讨了这些复合电极的析氢机理．实验结果表明，球磨不仅可使镍钼粉合金化成为纳米晶，同时随着球磨时间的增加，纳米晶晶粒继续细化，电极的析氢催化活性也随之提高．电化学脱附是这些复合电极析氢的速率决定步骤，这种在表面直接复合镀高催化活性粒子的方法是制作电极的一种行之有效的新方法．
English
Hydrogen Evolution Reaction on Composite-Coated Electrodes of Ball Milling-Formed Nanocrystalline Ni-Co Alloy
The electrochemical behaviours of the hydrogen evolution reaction (HER) on electrodes prepared by composite coating of nanocrystalline Ni-Mo alloy particles which was formed by ball miling on nickel base has been studied by steady-state polarization and ac impedance techniques. The microstructure and the particle size of Ni-Mo alloy nanocrystals and the morphology of the composite-coated surface of the electrodes were examined by XRD, TEM and SEM. The mechanism of HER on the composite electrodes has been investigated as well. Results showed that for HER the nanocrystalline Ni-Mo alloys prepared by high-energy ball milling revealed high electrocatalytic activity which was enhanced with increasing milling time. The reaction rate of HER on the electrodes was proved to be controlled by electrodesorption. The direct composite coating of highly electroactive particles onto the surface may serve as a new approach to the preparation of electrode materials.
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Key words:
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Composite coating
- / Hydrogen evolution reaction
- / Nanocrystalline
- / Ni-Mo alloy
- / Ball milling
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