Dehydriding Property of NaBH₄ Combined with Mg₂FeH₆

Abstract

The dehydriding property of xNaBH₄ + (1 − x) Mg₂FeH₆ (x = 0.1–0.75) is measured to investigate the effect of combining with complex hydride Mg₂FeH₆ on reducing dehydriding temperature of metal borohydrides, which has lately been found to be effective for LiBH₄. When x = 0.1 and 0.125, a single-step dehydriding reaction is observed, while in the composition range x ≥ 0.25, a multi-step dehydriding reaction is observed. Despite the different dehydriding process, X-ray diffraction measurements confirmed that Mg₂FeH₆ and NaBH₄ began releasing hydrogen simultaneously over the entire composition range. The results also indicate that the dehydriding temperature of NaBH₄ is reduced by at least 150 K when combining with Mg₂FeH₆.