LiBH4–VCl3 and LiAlH4–VCl3 mixtures prepared in soft milling conditions for hydrogen release at low temperature |
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| Affiliation: | 1. Unidad Morelia del Instituto de Investigaciones en Materiales de la Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro No. 8701.Col, Ex Hacienda de San José de la Huerta C.P. 58190, Morelia, Michoacán, Mexico;2. Programa de Nanociencias y Nanotecnología, Centro de Investigación y de Estudios Avanzados (Cinvestav-IPN), Av. Instituto Politécnico Nacional 2508, San Pedro Zacatenco, Deleg. Gustavo A. Madero, CP 07360, Ciudad de México, Mexico |
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| Abstract: | Mixtures of LiBH4/VCl3 and LiAlH4/VCl3 in 5:1, 3:1, and 5% mol stoichiometries were prepared and tested for hydrogen release. The mixtures were prepared in 10 min of ball milling at room temperature or with cryogenic (N2-liquid) cooling. The mixtures demonstrated diverse hydrogen release levels, but all of them started releasing hydrogen at low temperatures (33–66 °C) with a change in the reaction pathway as compared to pure LiBH4 or LiAlH4. The driving force for that is the formation of the stable salt LiCl. The best material was the 5% mol VCl3 + LiAlH4 cryogenic mixture because of the low-temperature dehydrogenation onset of 34 °C; and the dehydrogenation level of 5.1 wt.%, and 6.4 wt.% that was achieved upon heating at 100 °C and 250 °C, respectively. |
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| Keywords: | Hydrogen storage Reactive mixtures Low-temperature hydrogen release Cryogenic ball milling |
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