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

Aoki, M.; Ohba, N.; Noritake, T.; Towata, S.
July 2004
Applied Physics Letters;7/19/2004, Vol. 85 Issue 3, p387
Academic Journal
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.


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