Effect of CeH2.73-CeO2 Composites on the Desorption Properties of Mg2NiH4

A series of CeH 2. 73/CeO 2 composites with different ratios of hydride and oxide phases are prepared from the pure cerium hydride via oxidation treatments in the air at room temperature, and they are subsequently doped into Mg 2 NiH 4 by ball milling. The desorption properties of the as-prepared Mg...

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Bibliographic Details
Published in:Frontiers in chemistry 2020-04, Vol.8, p.293-293
Main Authors: Wu, Kaiyao, Cai, Daqian, Shao, Kaimei, Xue, Tuguang, Zhang, Peng, Li, Wei, Lin, Huai-Jun
Format: Article
Language:English
Subjects:
catalysts
CeH2.73/CeO2
Chemistry
dehydrogenation
Hydrogen storage materials
Mg2NiH4
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Summary:A series of CeH 2. 73/CeO 2 composites with different ratios of hydride and oxide phases are prepared from the pure cerium hydride via oxidation treatments in the air at room temperature, and they are subsequently doped into Mg 2 NiH 4 by ball milling. The desorption properties of the as-prepared Mg 2 NiH 4 +CeH 2.73 /CeO 2 composites are studied by thermogravimetry and differential scanning calorimetery. Microstructures are studied by scanning electron microscopy and transmission electron microscopy, and the phase transitions during dehydrogenation are analyzed through in situ X-ray diffraction. Results show that the initial dehydrogenation temperature and activation energy of Mg 2 NiH 4 are maximally reduced by doping the CeH 2.73 /CeO 2 composite with the same molar ratio of cerium hydride and oxide. In this case, the CeH 2.73 /CeO 2 composite has the largest density of interface among them, and the hydrogen release effect at the interface between cerium hydride and oxide plays an efficient catalytic role in enhancing the hydrogen desorption properties of Mg 2 NiH 4 .
ISSN:2296-2646
2296-2646
DOI:10.3389/fchem.2020.00293