Effects of Fe Modified Na₂WO₄ Additive on the Hydrogen Storage Properties of MgH₂

Abstract

A Fe modified Na₂WO₄ compound was synthesized by a solution impregnation method and was ball-milled with MgH₂ to constitute a novel MgH₂-Fe₂O₃/Na₂WO₄ composite. The effects of the Fe₂O₃/Na₂WO₄ additive on the hydrogen storage properties of MgH₂ together with the corresponding mechanism were investigated. At 423 K, within the first 200 seconds, the hydrogen absorption amount of MgH₂+20 wt% Fe₂O₃/Na₂WO₄ was almost 5 times that of pure MgH₂. And at 573 K, its total hydrogen desorption amount was 7 times that for pure MgH₂. Meanwhile, its onset dehydrogenation temperature was 110 K lower than that of pure MgH₂. It was worth noting that the MgH₂+20 wt% Fe/Na₂WO₄ presented the lower dehydrogenation reaction activation energy (E _a) of 35.9 kJ·mol^-1 compared to that of pure MgH₂. The active MgWO₄, Mg₂FeH₆ and MgO formed during the milling process were responsible for the improvement of the hydrogen storage properties for MgH₂.

Keywords

hydrogen storage composite / MgH₂ / Fe₂O₃/Na₂WO₄ / catalytic effects / activation energy

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