Abstract
To improve the hydrogen storage properties of Mg-based alloys, a composite material of MgH2 + 10wt%LaH3 + 10wt%NbH was prepared by a mechanical milling method. The composite exhibited favorable hydrogen desorption properties, releasing 0.67wt% H2 within 20 min at 548 K, which was ascribed to the co-catalytic effect of LaH3 and NbH upon dehydriding of MgH2. By contrast, pure MgH2, an MgH2 + 20wt%LaH3 composite, and an MgH2 + 20wt%NbH composite only released 0.1wt%, 0.28wt%, and 0.57wt% H2, respectively, under the same conditions. Analyses by X-ray diffraction and scanning electron microscopy showed that the composite particle size was small. Energy-dispersive X-ray spectroscopic mapping demonstrated that La and Nb were distributed homogeneously in the matrix. Differential thermal analysis revealed that the dehydriding peak temperature of the MgH2 + 10wt%LaH3 + 10wt%NbH composite was 595.03 K, which was 94.26 K lower than that of pure MgH2. The introduction of LaH3 and NbH was beneficial to the hydrogen storage performance of MgH2.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 50971112 and 51471065) and the Scientific Research Projects in Colleges and Universities in Hebei Province, China (ZD2014004).
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Song, Jz., Zhao, Zy., Zhao, X. et al. Hydrogen storage properties of MgH2 co-catalyzed by LaH3 and NbH. Int J Miner Metall Mater 24, 1183–1191 (2017). https://doi.org/10.1007/s12613-017-1509-z
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DOI: https://doi.org/10.1007/s12613-017-1509-z