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Phase transformations and hydrogen-storage characteristics of Mg-transition metal-oxide alloys

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Abstract

Samples with the compositions of 76.5 wt%Mg-23.5 wt%Ni (Mg-Ni), 71.5 wt%Mg-23.5 wt%Ni-5 wt% Fe2O3 (Mg-Ni-Fe2O3) and 71.5 wt%Mg-23.5 wt%Ni-5 wt% Fe2O3 (spray conversion) (Mg-Ni-scFe2O3), 71.5 wt%Mg-23.5 wt%Ni-5 wt% Fe (Mg-Ni-Fe) and 80 wt%Mg-13.33 wt%Ni-6.67 wt%Fe (Mg-13Ni-7Fe) were prepared by reactive mechanical grinding. Mg-13Ni-7Fe has the highest hydriding and dehydriding rates. After hydriding-dehydriding cycling, all the samples contain the Mg2Ni phase. The samples with Fe2O3 and Fe2O3(spray conversion) as starting materials contain the Mg(OH)2 phase after hydriding-dehydriding cycling as well as after reactive mechanical grinding. Mg-Ni-Fe and Mg-13Ni-7Fe contain the MgH2 phase after reactive mechanical grinding. Phases, space groups, cell parameters, contents and crystallite sizes were analyzed by Full Pattern Matching Refinement program, one of the Rietveld analysis programs, from the XRD powder patterns of Mg-Ni-scFe2O3 after reactive mechanical grinding and after hydriding-dehydriding cycling. The MgH2 phase formed in the Mg-Ni-Fe and Mg-13Ni-7Fe mixtures after reactive mechanical grinding is considered to help the pulverization of the materials during reactive mechanical grinding, leading to the high hydriding and dehydriding rates of these mixtures.

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Authors and Affiliations

  1. Division of Advanced Materials Engineering, Hydrogen & Fuel Cell Research Center, Engineering Research Institute, Chonbuk National University, 567 Baekje-daero, Deokjin-gu Jeonju, 561-756, Korea

    Myoung Youp Song

  2. Department of Hydrogen and Fuel Cells, Chonbuk National University, 567 Baekje-daero Deokjin-gu, Jeonju, 561-756, Korea

    Sung Hwan Baek

  3. ICMCB, CNRS [UPR 9048], Université de Bordeaux 1, 33608, Pessac cedex, France

    Jean-Loius Bobet

  4. School of Applied Chemical Engineering, Chonnam National University, 300 Yongbong-dong Buk-gu, Gwangju, 500-757, Korea

    Hye Ryoung Park

Authors
  1. Myoung Youp Song
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  2. Sung Hwan Baek
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  3. Jean-Loius Bobet
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  4. Hye Ryoung Park
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Correspondence to Myoung Youp Song.

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Song, M.Y., Baek, S.H., Bobet, JL. et al. Phase transformations and hydrogen-storage characteristics of Mg-transition metal-oxide alloys. Met. Mater. Int. 19, 237–244 (2013). https://doi.org/10.1007/s12540-013-2017-y

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  • DOI: https://doi.org/10.1007/s12540-013-2017-y

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