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Mg–Ti based materials for electrochemical hydrogen storage

Published online by Cambridge University Press:  31 January 2011

W.P. Kalisvaart ,
H.J. Wondergem ,
F. Bakker  and
P.H.L. Notten
W.P. Kalisvaart*
Affiliation:
Eindhoven University of Technology, Den Dolech 2, 5600 MB Eindhoven, The Netherlands
H.J. Wondergem
Affiliation:
Philips Research Materials Analysis, High Tech Campus 11, 5656 AE Eindhoven, The Netherlands
F. Bakker
Affiliation:
Philips Research Materials Analysis, High Tech Campus 11, 5656 AE Eindhoven, The Netherlands
P.H.L. Notten
Affiliation:
Eindhoven University of Technology, Den Dolech 2, 5600 MB Eindhoven, The Netherlands; and Philips Research Laboratories, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Results of the mechanical alloying of binary Mg–Ti and ternary Mg–Ti–Ni mixtures using two different process control agents are reported. Both high- and low-energy milling resulted in the formation of cubic compounds. When all starting reactants had disappeared, a mixture of two face-centered cubic (fcc) phases was formed with lattice constants around 4.40 and 4.25 Å. The electrochemical hydrogen storage capacity, 450 mAh/g for (Mg0.65Ti0.35)0.95Ni0.05, was about one-third that reported for Mg–Ti thin films. This suggested that only one of the two fcc phases was active at ambient conditions. Prolonged mechanical alloying of (Mg0.60Ti0.40)0.95Ni0.05resulted in full conversion of the material into one fcc-phase with a very small crystallite size, an intermediate lattice constant (4.33 Å), and a sharply decreased storage capacity.

Keywords

Energy-storageMechanical alloyingMg
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 6 , June 2007 , pp. 1640 - 1649
Copyright
Copyright © Materials Research Society2007

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