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Citation: Zhang Wen-Kui, Yang Xiao-Guang, Wang Yun-Gang, Yu Li-Yang, Ma Chun-An. Electrochemical Behaviors of Pd/Mm Rare Earth Film Electrodes in KOH Solution[J]. Acta Physico-Chimica Sinica, ;2003, 19(06): 569-572. doi: 10.3866/PKU.WHXB20030619 shu

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

1.
Department of Applied Chemistry,Zhejiang University of Technology,Hangzhou　310014;

Received Date: 7 October 2002
Available Online: 15 June 2003

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.
- Rareearth films;Electrochemical characteristics;Cyclic voltammetry; AC impedance Mischmetal(Mm)
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