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Hydrogen storage performance of 5LiBH4 + Mg2FeH6 composite system
Authors:Shuaishuai Deng  Xuezhang XiaoLeyuan Han  Yun LiShouquan Li  Hongwei GeQidong Wang  Lixin Chen
Affiliation:Department of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, Zhejiang Province, PR China
Abstract:The hydrogen storage properties of 5LiBH4 + Mg2FeH6 reactive hydride composites for reversible hydrogen storage were investigated by comparing with the 2LiBH4 + MgH2 composite in the present work. The dehydrogenation pathway and reaction mechanism of 5LiBH4 + Mg2FeH6 composite were also investigated and elucidated. The self-decomposition of Mg2FeH6 leads to the in situ formation of Mg and Fe particles on the surface of LiBH4, resulting in a well dispersion between different reacting phases. The formation of FeB is observed during the dehydrogenation of 5LiBH4 + Mg2FeH6 composite, which might supplies nucleation sites of MgB2 during the dehydrogenation process, but is not an ascendant catalyst for the self-decomposition of LiBH4. And FeB can also transform to the LiBH4 and Fe by reacting with LiH and H2 during the rehydrogenation process. The dehydrogenation capacity for 5LiBH4 + Mg2FeH6 composite still gets to 6.5 wt% even after four cycles. The X-ray diffraction analyses reveal the phase transitions during the hydriding and dehydriding cycle. The formed FeB in the composite maintains a nanostructure after four hydriding-dehydriding cycles. The loss of hydrogen storage capacity and de-/rehydrogenation kinetics can be attributed to the incomplete generation of Mg2FeH6 during the rehydrogenation process.
Keywords:Complex hydride  LiBH4  Mg2FeH6  MgH2  FeB  Hydrogen storage performance
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