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Mechanical alloying and electrochemical hydrogen storage of Mg-based systems

Published online by Cambridge University Press:  31 January 2011

W.P. Kalisvaart*
Affiliation:
Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
P.H.L. Notten
Affiliation:
Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands; and Philips Research Laboratories, 5656 AE Eindhoven, The Netherlands
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Results on mechanical alloying of binary and ternary Mg–Ti-based mixtures are reported. Using fine-powdered reactants and a process-control-agent, a mixture of two face-centered cubic compounds is obtained. Using a coarse Mg precursor without addition of a milling agent results in a hexagonal-solid solution of Ti in Mg due to a lower oxygen content in the Mg starting material. Upon introduction of Ni or Al as a third element, the amount of dissolved Ti decreases to form a nanocrystalline secondary phase. The electrochemical charging capacity of the hexagonal compounds is far superior to that of the cubic ones, whereas the discharge capacity is significantly increased only upon addition of Ni. The secondary TiNi phase acts as a rapid diffusion path for hydrogen, greatly improving the rate capability of the alloys. The reversible hydrogen storage capacity reaches values of up to 3.2 wt% at room temperature for (Mg0.75Ti0.25)0.90Ni0.10.

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Articles
Copyright
Copyright © Materials Research Society 2008

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