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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.

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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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References

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