Abstract
The synthesis and dehydrogenation performance of purified NaZn(BH4)3 with a new phase and its novel ammine metal borohydride, NaZn(BH4)3·2NH3, were first reported. Structure analysis shows that NaZn(BH4)3·2NH3 crystallizes in an orthorhombic structure with lattice parameters of a = 7.2965(2) A, b = 10.1444(2) A and c = 12.9714(3) A and space group P21nb, in which the Zn atoms are located in a tetrahedral coordination environment with two NH3 molecules and two BH4− units, presenting a novel 3D framework comprised of isolated BH4−1 units and [NaZn(BH4)2(NH3)2]+ complexes. Dehydrogenation results showed that the ZnCl2 assisted NaZn(BH4)3·2NH3 is able to release 7.9 wt% hydrogen at 110 °C without the concomitant release of undesirable gases such as ammonia and/or boranes, thereby demonstrating the potential of the ammoniated Zn-based borohydrides to be used as solid hydrogen storage materials.
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