Abstract
The effect of SiC on the hydrogen storage properties of Mg95Ni5 prepared by hydriding combustion synthesis and mechanical milling (HCS+MM) was studied. Product with 2wt.% SiC doping is the best one among these HCS+MM products in improving the hydrogen storage properties. It required only 80s to reach its saturated hydrogen capacity of 5.91wt.% at 373K and desorbed 69.7% hydrogen within 1800s at 523K. The activation energy for hydrogen desorption decreased from 160kJ/mol for Mg95Ni5 to 143kJ/mol for Mg95Ni5+2wt.% SiC, indicating that SiC has an obvious positive effect on the dehydriding properties. More importantly, cyclic hydriding analysis demonstrated that the HCS+MM–Mg95Ni5+2wt.% SiC composite possessed excellent cyclic hydriding stability at 473K. It is suggested that the microstructures of the HCS+MM products with SiC addition had remarkable influence on the enhancing of the hydriding/dehydriding and cyclic properties.
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