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Enhanced hydrogen sorption capacities and kinetics of Mg2Ni alloys by ball-milling with carbon and Pd coating

Published online by Cambridge University Press:  31 January 2011

R. Janot ,
L. Aymard ,
A. Rougier ,
G. A. Nazri  and
J. M. Tarascon
R. Janot
Affiliation:
Laboratoire de Réactivité et Chimie des Solides, Unité Mixte de Recherche (UMR) 6007, Université de Picardie, 33 rue St. Leu, 80039 Amiens, France
L. Aymard
Affiliation:
Laboratoire de Réactivité et Chimie des Solides, Unité Mixte de Recherche (UMR) 6007, Université de Picardie, 33 rue St. Leu, 80039 Amiens, France
A. Rougier
Affiliation:
Laboratoire de Réactivité et Chimie des Solides, Unité Mixte de Recherche (UMR) 6007, Université de Picardie, 33 rue St. Leu, 80039 Amiens, France
G. A. Nazri
Affiliation:
R&D, General Motors, Warren, Michigan 48090
J. M. Tarascon
Affiliation:
Laboratoire de Réactivité et Chimie des Solides, Unité Mixte de Recherche (UMR) 6007, Université de Picardie, 33 rue St. Leu, 80039 Amiens, France
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Abstract

Solid-state hydrogen storage alloys are becoming a practical method to transport and utilize hydrogen as fuel for various technologies. In this paper, the kinetics and capacity of hydrogen desorption from Mg-based alloys have markedly been enhanced by tuning the surface composition of alloy particles. Mg2Ni–Ct, x composites (where t refers to the pregrinding time and x to the Brunauer–Emmet–Teller specific surface area) were prepared by ball-milling the alloy in the presence of preground graphite, and Pd-coated Mg2Ni alloy powders were obtained by controlled chemical deposition of Pd on the alloy surface. We have found that the optimization of the pregrinding step of carbon is a determinant factor in enhancing the hydrogen desorption capacity of the Mg2Ni–10 wt.% C10,320 composites to 2.6 wt.% at 150 °C, the maximum performance so far reported on desorption for Mg-based alloys. Such value can even be raised to 2.8 wt.% by applying Pd deposition on the composite.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 18 , Issue 8 , August 2003 , pp. 1749 - 1752
Copyright
Copyright © Materials Research Society 2003

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References

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