Abstract
The hydrogen storage properties of ball milled xMgH2/(1−x)ScH2 (x=0.65–1) samples including capacity, kinetics, thermodynamics and cycling stability, were investigated. The effect of ScH2 catalyst content and ball milling duration on the kinetics of MgH2 dehydrogenation were studied. It was found that the optimal content of the catalyst ScH2 was ca. 12mol.%, which gave an activation energy (Ea) value of 62±5kJmol−1 and a hydrogen storage capacity of 5.8±0.1wt.% for the sample. There was no loss in kinetics in the ScH2 catalysed MgH2 system even after cycling at relatively high temperatures up to 450°C, and the nano-sized ScH2 (ca. 70nm) formed during ball milling remained after (de)hydrogenation cycling. Typical MgH2 dehydrogenation enthalpy (76±1kJmol−1 (H2)) and entropy (138±2Jmol−1K−1 (H2)) values observed by the 0.65MgH2/0.35ScH2 sample demonstrated the effect of ScH2 was purely a catalytic improvement of the kinetics.
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