The formation of a chemically stable and thermally cyclable Mg(BH₄)₂ melt is proven to be possible through the utilization of an organic borohydride salt additive. While extensive exploration of additives for lowering the melting point and modifying the chemical stability of Mg(BH₄)₂ has been reported, this is the first study to use the organic borohydride salt, tetramethylammonium borohydride (TMAB), to modify the melting behavior of Mg(BH₄)₂. Examination of a 5:1 molar mixture of Mg(BH₄)₂ and TMAB revealed a reversible melt between 180 and 195 °C, which was reproduced for five thermal cycles. The mixture melt exhibited an enhanced chemical stability compared to melts of the individual Mg(BH₄)₂ and TMAB species. It was observed that between room temperature and 250 °C (over 50 °C above the melting point), the mixture releases <0.1 wt % mass, consisting primarily of H₂. The mixture also exhibits greatly reduced evolution of volatile boron containing compounds compared to either Mg(BH₄)₂ or TMAB. The use of TMAB to chemically stabilize a Mg(BH₄)₂-rich melt demonstrated in this work represents an exciting pathway to modification of Mg(BH₄)₂ relevant to both hydrogen-storage and magnesium battery fields.

中文翻译：

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基于Mg（BH ₄）₂的混合金属-有机硼氢化物体系具有较高的熔体化学稳定性

通过使用有机硼氢化物盐添加剂，证明可以形成化学稳定且可热循环的Mg（BH ₄）₂熔体。虽然已经报道了广泛的添加剂探索以降低熔点和改变Mg（BH ₄）₂的化学稳定性，但这是首次使用有机硼氢化物盐四甲基硼氢化铵（TMAB）来改变Mg（BH ₄）₂的熔融行为的研究。 Mg（BH ₄）₂。Mg（BH ₄）₂的5：1摩尔混合物的检查TMAB揭示了在180至195°C之间可逆的熔体，并在五个热循环中得以复制。与单独的Mg（BH ₄）₂和TMAB种类的熔体相比，混合熔体显示出增强的化学稳定性。已观察到，在室温至250°C（高于熔点50°C）之间，混合物释放的质量<0.1 wt％，主要由H ₂组成。与Mg（BH ₄）₂或TMAB相比，该混合物还表现出大大减少了挥发性含硼化合物的释放。在这项工作中证明使用TMAB化学稳定富含Mg（BH ₄）_2的熔体代表了Mg（BH）改性的令人兴奋的途径₄）₂与储氢和镁电池领域有关。