Abstract
Although Li 3 N can theoretically absorb as much as about 10 wt % hydrogen, its reversible hydrogen capacity is only about 5.5 wt % because only a fraction of the hydrogen absorbed can be desorbed at relatively low temperatures. In the present paper, it is shown that the addition of LiNH 2 to Li 3 N constitutes an effective method to increase the reversible hydrogen capacity. It was found that the reversible hydrogen capacity of the LiNH 2 /Li 3 N mixture depends on its composition. A maximum reversible hydrogen capacity of 6.8 wt % could be achieved when the pre-added LiNH 2 content in the LiNH 2 /Li 3 N mixture was between 28 and 50 mol %. Furthermore, the LiNH 2 /Li 3 N mixtures have fast hydrogenation kinetics and excellent cyclibility.
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