Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (01): 123-130.doi: 10.3866/PKU.WHXB201210095

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Electro-Deposition of the Porous Composite Ni-P/LaNi5 Electrode and Its Electro-Catalytic Performance toward Hydrogen Evolution Reaction

DUAN Qian-Hua, WANG Sen-Lin, WANG Li-Pin   

  1. Department of Applied Chemistry, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, Fujian Province, P. R. China
  • Received:2012-08-02 Revised:2012-10-08 Published:2012-12-14

Abstract:

The composite Ni-P/(LaNi5+Al) coating was plated by the composite electro-deposition. Then, the porous composite Ni-P/LaNi5 coating was successfully prepared by dissolution Al with the concentrated alkali solution. The composition and structure of the coating were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray (EDS), and X-ray diffraction (XRD). In 20% (w) NaOH solution, the electro-catalytic and stable properties for hydrogen evolution reaction (HER) of the porous composite Ni-P/LaNi5 electrode were evaluated by electrochemical linear voltammetric scanning (LSV), constant potential electrolysis, and electrochemical impedance spectroscopy (EIS). As a result, the porous composite electrode exhibits a lower over-potential for HER, a higher specific surface area, and a better stabilization than that of the porous Ni-P electrode. The apparent activation energy for HER on the porous composite Ni-P/LaNi5 electrodes is 35.44 kJ·mol-1, which is lower than that of the porous Ni-P (50.91 kJ· mol-1).

Key words: Electro-deposition, Ni-P/LaNi5, Hydrogen evolution reaction, Electro-catalysis, Porous composite electrode

MSC2000: 

  • O646