A synchrotron X-ray diffraction study of hydrogen storage and enhanced sorption kinetics in a mini-tank of Mg with crystalline and amorphous catalytic particle additions

A. R. Yavari, G. Vaughan, F. Ribeiro De Castro, K. Georgarakis, A. M. Jorge, I. Nuta, W. J. Botta

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Previous work has established that when a few volume percent of transition metal-based particles are dispersed in nano-grained MgH 2 powders, H-sorption times are reduced to a few minutes at temperatures near 300 °C. We report H-sorption cycles performed in a mini-tank of Mg powders containing such particle dispersions placed in monochromatised synchrotron light going through the powders for in situ X-ray diffraction in transmission at the European Synchrotron Radiation Facility. The three selected catalyst particle dispersions were Nb 2O 5, FeF 3 and amorphous Ti 0.7Ni 0.3. The main result is that these very different 2nd phase particle additions have a similar impact on H-sorption in the sense that in all three MgH 2 powders, H-sorption goes to completion as T ≈ 270 °C reached during heating. The commonality of the three selected particle dispersions, two crystalline and one amorphous, is that their thermodynamic properties are consistent with the chemical conditions of immiscibility and H-attractive interfaces within MgH 2 powders. Once this condition is satisfied, the acceleration of the kinetics of sorption is likely dominated by the extent (specific area) of such internal interfaces.

    Original languageEnglish
    Pages (from-to)57-61
    Number of pages5
    JournalJournal of Alloys and Compounds
    Volume540
    DOIs
    Publication statusPublished - 2012 Nov 5

    Keywords

    • Hydrogen storage materials
    • Metal hydrides
    • Metallic glass
    • Synchrotron radiation
    • X-ray diffraction

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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