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

    研究成果: Article査読

    4 被引用数 (Scopus)

    抄録

    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.

    本文言語English
    ページ(範囲)57-61
    ページ数5
    ジャーナルJournal of Alloys and Compounds
    540
    DOI
    出版ステータスPublished - 2012 11 5

    ASJC Scopus subject areas

    • 材料力学
    • 機械工学
    • 金属および合金
    • 材料化学

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