Reversible hydriding and dehydriding properties of CaSi: Potential of metal silicides for hydrogen storage

We found that CaSi reversibly absorbs and desorbs hydrogen. First-principles calculations theoretically indicated that CaSi hydride is thermodynamically stable. The hydriding and dehydriding properties of CaSi were experimentally determined using pressure-composition ( p - c ) isotherms and x-ray di...

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Bibliographic Details
Published in:Applied physics letters 2004-07, Vol.85 (3), p.387-388
Main Authors: Aoki, M., Ohba, N., Noritake, T., Towata, S.
Format: Article
Language:English
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Summary:We found that CaSi reversibly absorbs and desorbs hydrogen. First-principles calculations theoretically indicated that CaSi hydride is thermodynamically stable. The hydriding and dehydriding properties of CaSi were experimentally determined using pressure-composition ( p - c ) isotherms and x-ray diffraction analysis. The p - c isotherms clearly demonstrated plateau pressures in a temperature range of 473 - 573 K . The maximum hydrogen content was 1.9 wt % under a hydrogen pressure of 9 MPa at 473 K . The reversible hydriding and dehydriding properties of CaSi suggest the potential of metal silicides for hydrogen storage.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1773930