| Investigations on hydrogen storage properties of LaMg8.52Ni2.23M0.15 （M=Ni, Cu, Cr） alloys |
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| 作者姓名： | 石和 韩树民 贾彦虹 刘岩青 赵鑫 刘宝忠 |
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| 作者单位： | State Key Laboratory of Metastable Materials Science and Technology,Yanshan University;College of Environmental and Chemical Engineering,Yanshan University |
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| 基金项目： | Project supported by High-Tech Research and Development(863)Program of China(2007AA05Z117);National Natural Science Foundation of China(50971112,51171165);the Natural Science Foundation of Hebei Province(E201001170) |
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| 摘 要： | LaMg8.52Ni2.23M0.15 (M=Ni, Cu, Cr) alloys were prepared by induction melting. X-ray diffraction showed that all the three alloys had a multiphase structure, consisting of La2Mg17, LaMg2Ni and Mg2Ni phases. Energy dispersive X-ray spectrometer results revealed that most of Cu and Cr distributed in Mg2Ni phase. La2Mg17 and LaMg2Ni phases decomposed into MgH2, Mg2NiH4 and LaH3 phases during the hydrogenation process. Hydriding/dehydriding measurements indicated that the reversible hydrogen storage capacities of Mg2Ni phase in LaMg8.52Ni2.23M0.15 (M=Cu, Cr) alloys increased to 1.05 wt.% and 0.97 wt.% from 0.79 wt.% of Mg2Ni phase in LaMg8.52Ni2.38 alloy at 523 K. Partial substitution of Cu and Cr for Ni decreased the onset dehydrogenation temperature of the alloy hydrides and the temperature lowered by 18.20 and 5.50 K, respectively. The improvement in the dehydrogenation property of the alloys was attributed to that Cu and Cr decreased the stability of Mg2NiH4 phase.
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| 关 键 词： | hydrogen storage material La-Mg-Ni-based alloy microstructure thermodynamics property hydriding kinetics rare earths |
| 收稿时间： | 2012-08-13 |
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