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Hydrogen Absorption and Desorption by Magnesium-Based Nano-Composite Materials

Published online by Cambridge University Press:  01 February 2011

Yoshitsugu Kojima ,
Yasuaki Kawai  and
Tetsuya Haga
Yoshitsugu Kojima
Affiliation:
Toyota Central R& D Labs., Inc., Nagakute, Aichi, 480–1192 JAPAN
Yasuaki Kawai
Affiliation:
Toyota Central R& D Labs., Inc., Nagakute, Aichi, 480–1192 JAPAN
Tetsuya Haga
Affiliation:
Toyota Central R& D Labs., Inc., Nagakute, Aichi, 480–1192 JAPAN
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Abstract

MgH2 was mechanically milled with nano-Ni (nano-Ni/Al2O3/C) and Ni catalysts (Ni), yielding Mg-based nano-composite materials. X-ray and TEM measurements revealed that nano-Ni particles, which are 6–20 nm size, were dispersed in the MgH2 matrix. The nano-composite material with nano-Ni/Al2O3/C showed excellent properties as compared to that with Ni, a ball-milled MgH2 and the mixture of MgH2 and nano-Ni/Al2O3/C in terms of the H2 desorption and absorption. The nano-composite material with nano-Ni/Al2O3/C desorbed H2 of 4.9–5.8 wt% at 423–473 K, while the mixture could not desorb H2 at the temperature. The H2 absorption capacity at 9 MPa and room temperature in 6 hr. increased from below 0.1 wt% for the mixture to 5.0 wt % for the nano-composite material, approaching a maximum of 6.5 wt% in 70 hr. The catalyst activity was improved with decreasing Ni size. The improved kinetics is indicated by the small activation barrier, the short diffusion path length and the high driving force.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 837: Symposium N – Materials for Hydrogen Storage – 2004 , 2004 , N3.5
Copyright
Copyright © Materials Research Society 2005

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