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选择Mg17Al12-氢化物作为失稳剂与LiBH4进行球磨以改善LiBH4体系的吸放氢性能。研究表明,LiBH4/Mg17Al12-氢化物复合体系发生两步放氢过程。复合体系在300°C开始放氢并在500°C下产生9.8%的放氢量。通过添加Mg17Al12-氢化物,LiBH4的放氢动力学得到有效改善,并且其放氢温度降低20°C。复合体系的放氢产物在450°C的首次再加氢容量可高达8.3%。XRD分析表明,复合体系在放氢过程中所形成的MgB2和AlB2可降低LiBH4的热力学稳定性,进而有效改善LiBH4/Mg17Al12-氢化物复合体系的可逆储氢行为。
The Mg17Al12-hydride was chosen as a destabilizer to be ball-milled with LiBH4 to improve the hydrogen-absorbing and desorbing properties of LiBH4 system. Studies have shown that LiBH4 / Mg17Al12-hydride composite system two-step discharge process. The composite system started to discharge hydrogen at 300 ° C and produced 9.8% of the amount of hydrogen released at 500 ° C. By adding Mg17Al12-hydride, the kinetics of hydrogen desorption of LiBH4 is effectively improved, and its hydrogen desorption temperature is reduced by 20 ° C. The hydrogen production capacity of the composite system can reach as high as 8.3% for the first time at 450 ° C. XRD analysis showed that the formation of MgB2 and AlB2 in the composite system can reduce the thermodynamic stability of LiBH4, and then effectively improve the reversible hydrogen storage behavior of LiBH4 / Mg17Al12-hydride composite system.