Rehydrogenation and cycle studies of LiBH4-CaH2 composite

Jae Hag Lim, Jae Hyeok Shim, Young Su Lee, Jin Yoo Suh, Young Whan Cho, Joonho Lee

    Research output: Contribution to journalArticlepeer-review

    41 Citations (Scopus)

    Abstract

    Rehydrogenation behavior of 6LiBH4 + CaH2 composite with NbF5 has been studied between 350 and 500 °C after dehydrogenation at 450 °C. The composite exhibits the best rehydrogenation feature at 450 °C in terms of the overall rehydrogenation rate and the amount of absorbed hydrogen. It is found that about 9 wt% hydrogen is absorbed at 450 °C for 12 h. Up to 10 dehydrogenation-hydrogenation cycles have been carried out for the composite. It is demonstrated that 6LiBH4 + CaH2 with 15 wt% NbF5 maintains a reversible hydrogen storage capacity of about 6 wt% at 450 °C after a slight degradation between the 1st and 5th cycles. The addition of NbF5 seems to improve the cycle properties by retarding microstructural coarsening during cycles.

    Original languageEnglish
    Pages (from-to)6578-6582
    Number of pages5
    JournalInternational Journal of Hydrogen Energy
    Volume35
    Issue number13
    DOIs
    Publication statusPublished - 2010 Jul

    Bibliographical note

    Funding Information:
    This study has been sponsored by the Hydrogen Energy R&D Center, one of 21st Century Frontier R&D Programs funded by the Ministry of Education, Science and Technology of Korea .

    Keywords

    • Cycle
    • Destabilization
    • Hydrogen storage
    • Lithium borohydride
    • Rehydrogenation

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Fuel Technology
    • Condensed Matter Physics
    • Energy Engineering and Power Technology

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