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Segregation effect and XPS valence band studies in hydrogen storage nanocomposities

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In recent years many new developments have occurred in metal hydrides, from the introduction of new, non-conventional methods of fabrication, surface treatment, or by discoveries of new hydride phases [1, 2]. A large number of investigations on Mg2Ni - and ZrV2 - type compounds have been performed up to now in relation to their exceptional hydrogenation properties. Magnesium-based hydrogen storage alloys have been also considered to be possible candidates for electrodes in Ni-MH batteries [2]. Several semi-empirical models have been proposed for the heat of formation and heat of solution of metal hydrides and attempts have been made to justify the maximum hydrogen absorption capacity of the metallic matrices [3, 4]. These models showed that the energy of the metal‑hydrogen[...]

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