物理化学学报 >> 1996, Vol. 12 >> Issue (01): 22-28.doi: 10.3866/PKU.WHXB19960106

研究论文 上一篇    下一篇

球磨形成的Ni-Mo纳米晶复合镀层上的析氢反应

马洁,蒋雄,江琳才,吕曼祺   

  1. 首都师范大学化学系,北京 100037|华南师范大学化学系,广州 510631|中国科学院金属研究所快速凝固非平衡合金国家重点实验室,沈阳 110015
  • 收稿日期:1995-03-16 修回日期:1995-05-15 发布日期:1996-01-15
  • 通讯作者: 马洁

Hydrogen Evolution Reaction on Composite-Coated Electrodes of Ball Milling-Formed Nanocrystalline Ni-Co Alloy

Ma Jie,Jiang Xiong,Jiang Lin-Cai,Lv Man-Qi   

  1. Department of Chemistry,Capital Normal University,Beijing 100037|Department of Chemistry,South China Normal University,Guangzhou 510631|Institute of Metal Research Academia Sinica State Key Lab of Rapidly Solidified Non-Equilibrium Alloys,Shenyang 110015
  • Received:1995-03-16 Revised:1995-05-15 Published:1996-01-15
  • Contact: Ma Jie

摘要:

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.

关键词: 复合镀, 析氢反应, 纳米晶, Ni-Mo合金, 球磨

Abstract:

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.

Key words: Composite coating, Hydrogen evolution reaction, Nanocrystalline, Ni-Mo alloy, Ball milling