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/molH2, and the calculated activation energy of hydrogen desorption of MgH2 was 150(±10) kJ/mol.
ZLOTEA Claudia;
SAHLBERG Martin;
MORETTO Pietro;
ANDERSSON Yvonne;
2009-12-03
ELSEVIER SCIENCE SA
JRC53292
0925-8388,
http://www.elsevier.com/locate/jallcom,
https://publications.jrc.ec.europa.eu/repository/handle/JRC53292,
10.1016/j.jallcom.2009.09.08,
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