Designing an AB2-Type Alloy (TiZr-CrMnMo) for the Hybrid Hydrogen Storage Conceptстатья
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Дата последнего поиска статьи во внешних источниках: 19 августа 2020 г.
Аннотация:The hybrid hydrogen storage method consists of the combination of both solid-state metalhydrides and gas hydrogen storage. This method is regarded as a promising trade-off solutionbetween the already developed high-pressure storage reservoir, utilized in the automobile industry,and solid-state storage through the formation of metal hydrides. Therefore, it is possible to lowerthe hydrogen pressure and to increase the hydrogen volumetric density. In this work, we designa non-stoichiometric AB2 C14-Laves alloy composed of (Ti0.9Zr0.1)1.25Cr0.85Mn1.1Mo0.05. This alloyis synthesized by arc-melting, and the thermodynamic and kinetic behaviors are evaluated ina high-pressure Sieverts apparatus. Proper thermodynamic parameters are obtained in the rangeof temperature and pressure from 3 to 85 ◦C and from 15 to 500 bar: ∆Habs. = 22 ± 1 kJ/mol H2,∆Sabs. = 107 ± 2 J/K mol H2, and ∆Hdes. = 24 ± 1 kJ/mol H2, ∆Sdes. = 110 ± 3 J/K mol H2. The additionof 10 wt.% of expanded natural graphite (ENG) allows the improvement of the heat transfer properties,showing a reversible capacity of about 1.5 wt.%, cycling stability and hydrogenation/dehydrogenationtimes between 25 to 70 s. The feasibility for the utilization of the designed material in a high-pressuretank is also evaluated, considering practical design parameters.