Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (06): 569-572.doi: 10.3866/PKU.WHXB20030619

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Electrochemical Behaviors of Pd/Mm Rare Earth Film Electrodes in KOH Solution

Zhang Wen-Kui;Yang Xiao-Guang;Wang Yun-Gang;Yu Li-Yang;Ma Chun-An   

  1. Department of Applied Chemistry,Zhejiang University of Technology,Hangzhou 310014;
  • Received:2002-10-07 Revised:2003-02-24 Published:2003-06-15
  • Contact: Zhang Wen-Kui

Abstract: Pd/Mm(mischmetal) rare earth films were prepared by magnetron sputtering technology,the crystal structure,morphology and electrochemical behavior of the asprepared films were investigated by using XRD,AFM and electrochemical measurement techniques including cyclic voltammetry and AC impedance.The results showed that Pd coatings is a kind of island structure with 30~50 nm in size.The electrochemical reduction or oxidation of hydrogen only occurred on the Pd coatings.The electrochemical impedance spectra of Pd/Mm film electrodes was composed of two semicircles,of which the low frequency zone is corresponded to the solid diffusion process of H atom in the film,and the high one to the electrochemical reaction on the surface of the electrode.The solid diffusion process of H atom in the inner rare earth layer is the ratecontrolled step.

Key words: Rareearth films, Electrochemical characteristics, Cyclic voltammetry