Storage Of Hydrogen In The Mixture Of Activated Carbon And LaNi₅ Alloy

The sorption equilibria of hydrogen onto activated carbon, LaNi5 alloy and the mixture of them were measured with a volumetric method. The experiments show that hydrogen storage in activated carbon has low volumetric density but high weight percentage of storage, while that in LaNi₅ alloy has high volumetric storage density but very low weight percentage of storage. The storage capability of their mixture decreases after ball milling, and the longer milling time, the lower storage capability. Mixing activated carbon and LaNi5 alloy mechanically, the storage capability of the mixture is shown equal to the sum of the individual capabilities. Based on the additivity of storage capacities, the weight percentage of storage(wt%, hydrogen mass/system mass) and V_{(0.1MPa, 298.15K)}/V at -80℃ and 0-6MPa pressure of the mixture was determined for different mixing ratio. Although the storage capacity of the two materials has some complementary feature, there is no suitable proportion with which both the weight percentage and volumetric density can maintain at a relatively high level.