Dehydriding Property of NaBH<sub>4</sub> Combined with Mg<sub>2</sub>FeH<sub>6</sub>

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Abstract

The dehydriding property of <i>x</i>NaBH<sub>4</sub> + (1 − <i>x</i>) Mg<sub>2</sub>FeH<sub>6</sub> (<i>x</i> = 0.1–0.75) is measured to investigate the effect of combining with complex hydride Mg<sub>2</sub>FeH<sub>6</sub> on reducing dehydriding temperature of metal borohydrides, which has lately been found to be effective for LiBH<sub>4</sub>. When <i>x</i> = 0.1 and 0.125, a single-step dehydriding reaction is observed, while in the composition range <i>x</i> ≥ 0.25, a multi-step dehydriding reaction is observed. Despite the different dehydriding process, X-ray diffraction measurements confirmed that Mg<sub>2</sub>FeH<sub>6</sub> and NaBH<sub>4</sub> began releasing hydrogen simultaneously over the entire composition range. The results also indicate that the dehydriding temperature of NaBH<sub>4</sub> is reduced by at least 150 K when combining with Mg<sub>2</sub>FeH<sub>6</sub>.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 55(8), 1141-1143, 2014

    The Japan Institute of Metals and Materials

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