Hydrogen storage behaviour of Li3N doped with Li2O and Na2O

Mixtures of Li2O/Li3N and Na2O/Li3N have been investigated for hydrogen storage. When Li3N is doped with ca. 5 mol% Li2O and annealed, both binary compounds exist as separate phases as evident from powder X-ray diffraction. Li2O acts as a spectator in the hydrogen storage reactions and there is no evidence of enhanced Li+ or H+ mobility. Na2O (5 mol%) interacts more strongly with Li3N, leading to the generation of an unidentified phase, which also appears to play no part in the hydrogen storage reactions of the composite system. We conclude that addition of these levels of Li2O or Na2O to Li3N followed by annealing does not improve the hydrogen storage properties of Li3N.