Abstract
A Fe modified Na2WO4 compound was synthesized by a solution impregnation method and was ball-milled with MgH2 to constitute a novel MgH2-Fe2O3/Na2WO4 composite. The effects of the Fe2O3/Na2WO4 additive on the hydrogen storage properties of MgH2 together with the corresponding mechanism were investigated. At 423 K, within the first 200 seconds, the hydrogen absorption amount of MgH2+20 wt% Fe2O3/Na2WO4 was almost 5 times that of pure MgH2. And at 573 K, its total hydrogen desorption amount was 7 times that for pure MgH2. Meanwhile, its onset dehydrogenation temperature was 110 K lower than that of pure MgH2. It was worth noting that the MgH2+20 wt% Fe/Na2WO4 presented the lower dehydrogenation reaction activation energy (Ea) of 35.9 kJ·mol-1 compared to that of pure MgH2. The active MgWO4, Mg2FeH6 and MgO formed during the milling process were responsible for the improvement of the hydrogen storage properties for MgH2.
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Funded by the National Natural Science Foundation of China(No.51771164), Scientific Research Projects in Colleges and Universities in Hebei Province, China (No.ZD2019307), the Fundamental Research Funds for the Central Universities (No. 3142019013), the Natural Science Foundation of Hebei Province of China(No.E2019508214), and the Program for Top-notch Young Talents in University of Hebei Province (No.BJ2016043)
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Wang, J., Zhang, W., Li, B. et al. Effects of Fe Modified Na2WO4 Additive on the Hydrogen Storage Properties of MgH2. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 34, 1030–1036 (2019). https://doi.org/10.1007/s11595-019-2155-2
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DOI: https://doi.org/10.1007/s11595-019-2155-2