Hydrogen storage properties of Li-Mg-N-H systems

摘要

The hydriding and dehydriding reactions of M(NH_2)_y, where M = Li - xa.t. percent Mg (x = 0-100 and y = 1-2), were examined for the purpose of developing reversible hydrogen storage materials. At the start of the reaction, the dehydriding temperatures of LiNH_2 with partial Mg substitutions drastically decrease with an increase in the Mg concentrations, to approximately 370 K with x = 30. Moreover, the reversible dehydriding and rehydriding reactions of Mg(NH_2)_2, in which 9.1 mass percent of hydrogen can be stored, were successively investigated. The reversible hydriding and dehydriding reactions of M(NH_2)_y are useful for the development of hydrogen storage materials for fuel cell applications.