Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7934732 | Progress in Natural Science: Materials International | 2018 | 8 Pages |
Abstract
In this work, polyvinylpyrrolidone (PVP) coated Mg95Ni5 nano-composites were prepared by hydriding combustion synthesis (HCS) plus wet mechanical milling (WM) with tetrahydrofuran (THF) and donated as WM-x wt% PVP (x = 1, 3, 5 and 7) respectively. The phase compositions, microstructures and dehydriding property, as well as the co-effect of PVP and THF were investigated in detail. XRD results showed that the average crystal size of MgH2 in the milled Mg95Ni5 decreased from 23â¯nm without PVP to 18â¯nm with 1â¯wt% PVP. The peak temperature of dehydrogenation of MgH2 in the milled Mg95Ni5 decreased from 293.0â¯Â°C without THF to 250.4â¯Â°C with THF. The apparent activation energy for decomposition of MgH2 in WM-7â¯wt% PVP was estimated to be 66.94â¯kJ/mol, which is 37.70â¯kJ/mol lower than that of milled Mg95Ni5 without THF and PVP. PVP and THF can facilitate the refinement of particle size during mechanical milling process. Attributed to small particle sizes and synergistic effect of PVP and THF, the composites exhibit markedly improved dehydriding properties.
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Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Linglong Yao, Huihui Han, Yana Liu, Yunfeng Zhu, Yao Zhang, Liquan Li,