物理化学学报 >> 2011, Vol. 27 >> Issue (06): 1417-1423.doi: 10.3866/PKU.WHXB20110510

电化学和新能源 上一篇    下一篇

Ni-Mo/LaNi5多孔复合电极的制备及其电催化析氢性能

王森林, 张艺   

  1. 华侨大学材料科学与工程学院应用化学系, 福建 厦门 361021
  • 收稿日期:2010-12-06 修回日期:2011-01-23 发布日期:2011-05-31
  • 通讯作者: 王森林 E-mail:slwang@hqu.edu.cn

Preparation and Electrocatalytic Performance of Ni-Mo/LaNi5 Porous Composite Electrode toward Hydrogen Evolution Reaction

WANG Sen-Lin, ZHANG Yi   

  1. Department of Applied Chemistry, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, Fujian Province, P. R. China
  • Received:2010-12-06 Revised:2011-01-23 Published:2011-05-31
  • Contact: WANG Sen-Lin E-mail:slwang@hqu.edu.cn

摘要:

用复合电沉积及碱液溶解法制备了Ni-Mo/LaNi5多孔复合电极. 运用扫描电镜和X射线衍射表征了复合电极的多孔两相复合结构. 在20% (w) NaOH溶液中, 采用稳态极化、电化学阻抗技术研究了Ni-Mo/LaNi5多孔复合电极的电催化析氢性能, 电化学脱附为整个反应的控制步骤. 用循环伏安、长时间间断电解和差示扫描量热实验评价了该电极的稳定性能. 结果表明, 含有LaNi5的多孔复合电极的电催化性能得到了提高, 并且具有优异的抗断电性能.

关键词: Ni-Mo/LaNi5, 多孔复合电极, 复合电沉积, 析氢反应, 稳定性

Abstract:

A Ni-Mo/LaNi5 porous composite electrode was successfully prepared by composite electrodeposition and dissolution with a concentrated alkali solution. We found that the electrode consisted of two phases and a porous structure using scanning electron microscopy (SEM) and X-ray diffraction (XRD). In a 20% (w) NaOH solution the electrocatalytic properties toward hydrogen evolution reaction (HER) of the electrode was evaluated using electrochemical steady-state polarization curve and electrochemical impendence spectroscopy (EIS). As a result, the porous composite electrode had good electrocatalytic activity toward HER. We also found that the control step in the HER was the electrochemical de-absorption of hydrogen. The stability of the porous composite electrode was investigated by cycle voltammetry, discontinuity constant potential electrolysis over a long time, and differential scanning calorimetry (DSC). The results show that the stability of the porous composite electrode is good.

Key words: Ni-Mo/LaNi5, Porous composite electrode, Composite electrodeposition, Hydrogen evolution reaction, Stability

MSC2000: 

  • O646