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Electrochemical and Thermal Properties of Hydrogen-absorbed Mg67Ni28Pd5 Amorphous Alloy

Published online by Cambridge University Press:  31 January 2011

Shin-Ichi Yamaura ,
Keita Isogai ,
Hisamichi Kimura  and
Akihisa Inoue
Shin-Ichi Yamaura
Affiliation:
Institute for Materials Research, Tohoku University, 2–1-1 Katahira, Aoba, Sendai 980–8577, Japan
Keita Isogai
Affiliation:
Institute for Materials Research, Tohoku University, 2–1-1 Katahira, Aoba, Sendai 980–8577, Japan
Hisamichi Kimura
Affiliation:
Institute for Materials Research, Tohoku University, 2–1-1 Katahira, Aoba, Sendai 980–8577, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, 2–1-1 Katahira, Aoba, Sendai 980–8577, Japan
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Abstract

We have examined electrochemical properties and thermal stability of the amorphous Mg67Ni28Pd5 alloy produced by melt-spinning subjected to electrochemical hydrogen charge. In the cyclic life test, the discharge capacity of the alloy increases significantly with increasing cycle number and reaches 411 mA h/g at the 15th cycle. Thehydrogen-absorbed amorphous alloy crystallizes through two stages of primarycrystallization of Mg2Ni, followed by precipitation of Mg2NiH4 at the second stage.The completed crystallization temperature of the hydrogen-absorbed alloy increases by 65 K as compared with the as-solidified one. It is thus concluded that stability of theMg-based amorphous alloy against crystallization increases by hydrogen absorption.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 1 , January 2002 , pp. 60 - 64
Copyright
Copyright © Materials Research Society 2002

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