LaNi4.25Al0.75/SiO2 composite was prepared by fumed silica method. The effect of heat treatment temperature （473-1 073 K） on phase composition, microstruc- ture, hydrogen absorption/desorption pressure-composition isotherms （p-C-T curves）, hydrogen absorption kinetics and absorption/desorption cycling properties of this composite was studied. The results indicate that with increasing the heat treatment temperature, hydrogen uptake capacity decreases, p-C-T plateau pressure and plateau slope increase slightly, while absorption kinetics almost keeps stable. After 60 cycles of hydrogen absorption/desorption the composite heat treated at all studied temperatures do not pulverize, and the hydrogen storage properties do not show significant difference from that of the as-prepared.
修改评论