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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.8 (2001)  >  pp.1588-1592

MATERIALS TRANSACTIONS
<<Previous article Vol.42  No.8 (2001)   pp.1588 - 1592 Next article>>

Mg-Based Hydrogen Storage Materials with Improved Hydrogen Sorption

Wolfgang Oelerich1), Thomas Klassen1) and Rüdiger Bormann1)
1) GKSS Research Center Geesthacht GmbH

Nanocrystalline MgH2/MexOy composite powders were produced by high energy ball milling (MexOy=Sc2O3, TiO2, V2O5, Cr2O3, Mn2O3, Fe3O4, CuO, Al2O3, SiO2). The hydrogen absorption and desorption kinetics were determined in view of a technical application. The addition of selected oxides lead to an enormous catalytic acceleration of hydrogen sorption compared to pure nanocrystalline hydrides. In absorption, the catalytic effect of TiO2, V2O5, Cr2O3, Mn2O3, Fe3O4, and CuO is comparable. Concerning desorption, the composite material containing Fe3O4 shows the fastest kinetics followed by V2O5, Mn2O3, Cr2O3 and TiO2. Only 0.2 mol% of the catalysts is sufficient to provide a fast sorption kinetics. Additionally, Mg absorbs hydrogen already at room temperature by the use of metal oxides as catalysts. Furthermore, it is demonstrated for the first time that MgH2/MexOy-powders release hydrogen at 200°C.


Keyword:
high energy ball milling, nanocrystalline microstructure, hydrogen storage, magnesium hydride, catalysis, metal oxide catalyst

Received: February 20, 2001
Accepted: April 02, 2001 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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