Improved dehydriding property of polyvinylpyrrolidone coated Mg-Ni hydrogen storage nano-composite prepared by hydriding combustion synthesis and wet mechanical milling
| Autor: | Yunfeng Zhu, Huihui Han, Liquan Li, Yana Liu, Linglong Yao, Yao Zhang |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Polyvinylpyrrolidone 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Decomposition 0104 chemical sciences Hydrogen storage chemistry.chemical_compound chemistry Chemical engineering lcsh:TA401-492 medicine lcsh:Materials of engineering and construction. Mechanics of materials General Materials Science Dehydrogenation Particle size 0210 nano-technology Tetrahydrofuran medicine.drug |
| Zdroj: | Progress in Natural Science: Materials International, Vol 28, Iss 1, Pp 7-14 (2018) |
| ISSN: | 1002-0071 |
| DOI: | 10.1016/j.pnsc.2018.01.011 |
| Popis: | 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 23 nm without PVP to 18 nm with 1 wt% PVP. The peak temperature of dehydrogenation of MgH2 in the milled Mg95Ni5 decreased from 293.0 °C without THF to 250.4 °C with THF. The apparent activation energy for decomposition of MgH2 in WM-7 wt% PVP was estimated to be 66.94 kJ/mol, which is 37.70 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. Keywords: Mg-Ni-PVP, Composite, Mg-based alloy, Wet mechanical milling, Dehydriding temperature |
| Databáze: | OpenAIRE |
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