Abstract
Hydrogen storage in Li3N was investigated via temperature-programmed hydrogenation (TPH) and temperature-programmed dehydrogenation (TPD). TPH spectra indicated an initial hydrogenation temperature of Li3N of ∼150 °C, independent of the H2 partial pressure even below 0.5 atm. However, the increase in H2 partial pressure accelerated the hydrogenation rate. The TPD curves exhibited three H2 peaks located at 240, 270, and above 380 °C. The maximum amount of low-temperature released H2 corresponding to the two peaks at 240 and 270 °C was 6.0 wt %. XRD indicated that most of the low-temperature released hydrogen can be attributed to the transformation of LiNH2 to Li2NH. The amount and properties of the releasable hydrogen are also dependent on the duration and temperature of the Li3N hydrogenation.
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