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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 5    October 2001

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Study on hydrogen diffusion behavior in
MlNi3.75Co0.65Mn0.4Al0.2alloy electrode
by chronoamperometry
YUAN Xian-xia(原鲜霞), XU Nai-xin(徐乃欣)

Shanghai Institute of Metallurgy, Chinese Academy of
Sciences,Shanghai 200050, P.R.China

Abstract: Hydrogen diffusion coefficients in MlNi3.75Co0.65Mn0.4Al0.2 alloy electrode as a function of state of charge (SOC) or temperature were determined by chronoamperometry. It is found that hydrogen diffusion coefficient decreases with the increase of SOC or the decrease of temperature. The activation energy for hydrogen diffusion in the alloy electrode with 50%SOC is evaluated to be 19.9?kJ/mol.

 

Key words:  hydrogen storage alloy electrode; hydrogen diffusion coefficient, chronoamperometry

ISSN 1672-7029
CN 43-1423/U

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