Hydrogen storage properties of MgH<sub>2</sub> co-catalyzed by LaH<sub>3</sub> and NbH

Jian-zheng Song; Zi-yang Zhao; Xin Zhao; Rui-dong Fu; Shu-min Han

doi:10.1007/s12613-017-1509-z

Volume 24 Issue 10

Oct. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(10): 1183-1191

Jian-zheng Song, Zi-yang Zhao, Xin Zhao, Rui-dong Fu, and Shu-min Han, Hydrogen storage properties of MgH₂ co-catalyzed by LaH₃ and NbH, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1183-1191. https://doi.org/10.1007/s12613-017-1509-z

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Jian-zheng Song, Zi-yang Zhao, Xin Zhao, Rui-dong Fu, and Shu-min Han, Hydrogen storage properties of MgH2 co-catalyzed by LaH3 and NbH, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1183-1191. https://doi.org/10.1007/s12613-017-1509-z

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Research ArticleOpen Access

Hydrogen storage properties of MgH₂ co-catalyzed by LaH₃ and NbH

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Corresponding author:
Shu-min Han E-mail: hanshm@ysu.edu.cn
Received: 30 December 2016; Revised: 3 May 2017; Accepted: 4 May 2017

Abstract

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.
- energy storage materials;
- hydrogen absorbing materials;
- mechanical milling;
- phase transformation;
- activation analysis

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