Microstructure characterization and hydrogen storage properties study of Mg2Ni0.92M0.08 (M = Ti, V, Fe or Si) alloys

Microstructure characterization and hydrogen storage properties study of Mg2Ni0.92M0.08 (M = Ti, V, Fe or Si) alloys
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Mg2Ni0.92M0.08(M=Ti、V、Fe或Si)合金的显微组织表征和储氢性能研究

DOI:
10.1016/j.pnsc.2018.06.006
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发表时间:
2018-08
期刊:
Progress in Natural Science:Materials International
影响因子:
--
通讯作者:
Si Tingzhi
Si Tingzhi
中科院分区:
其他
文献类型:
--
作者:
Zhang Yue;Zhang Hairi;Ding Xiaoli;Liu Dongming;Zhang Qingan;Si Tingzhi

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在本研究中,Mg 2Ni型化合物与Ti,V,Fe和Si独立合金化,成功地制备了湿磨,然后烧结。虽然这些合金化的Mg 2Ni化合物表现出类似的储氢机制的纯Mg 2Ni,Ti,V或Fe的溶解到Mg 2NiH 4晶格有相当大的催化作用,从额外的MgH 2的氢脱附。进一步的结构研究表明,Ti替代Ni可抑制低温相(LT 2)的形成,促进高温相(HT)的形成,从而显著改善Mg 2Ni 0. 92 Ti 0. 08-H体系的放氢动力学。
In the present study Mg2Ni-type compounds alloyed independently with Ti, V, Fe and Si were successfully prepared by wet-milling followed by sintering. Although these alloyed Mg2Ni compounds exhibited a similar hydrogen storage mechanism as that of pure Mg2Ni, the dissolution of Ti, V or Fe into the Mg2NiH4lattice had a considerable catalytic effect on hydrogen desorption from additional MgH2. The further structure investigations clearly indicated that the substitution of Ti for Ni could suppress the formation of the micro-twined low-temperature phase (LT2) and promote the formation of the high-temperature phase (HT), thus resulting in remarkably improved hydrogen desorption kinetics for the Mg2Ni0.92Ti0.08–H system.
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