Hydrogen sorption properties of a Mg-Y-Ti alloy
2010 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 489, no 2, 375-378 p.Article in journal (Refereed) Published
The catalytic effect of titanium on the hydrogen sorption properties of a Mg–Y–Ti alloy has been investigated. The alloy is formed by a majority phase Mg24+xY5, a minor phase of solid solution of Y in Mg and Ti clusters randomly dispersed in the sample. During the first hydrogen absorption cycle 5.6 wt.% hydrogen was absorbed at temperatures above 613 K. The alloy decomposed almost completely to MgH2 and YH3. After hydrogen desorption pure Mg and YH2 were formed. For further absorption/desorption cycles the material had a reversible hydrogen capacity of 4.8 wt.%. The MgH2 decomposition enthalpy was determined to −68 kJ/mol H2, and the calculated activation energy of hydrogen desorption of MgH2 was 150(±10) kJ/mol.
Place, publisher, year, edition, pages
2010. Vol. 489, no 2, 375-378 p.
Magnesium intermetallics, Hydrides, Hydrogen storage materials, X-ray diffraction.
Research subject Inorganic Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-107390DOI: 10.1016/j.jallcom.2009.09.085ISI: 000273251000014OAI: oai:DiVA.org:uu-107390DiVA: diva2:229063