Effect of the Heat Pretreatment of Li₃N on Its H₂ Storage Performance

Abstract

A comparison between the hydrogen storage performances of untreated and heat-treated Li3N was carried out using a volumetric method, temperature-programmed hydrogenation (TPH), and scanning electron microscopy (SEM). It was found that, during the first hydrogenation, the untreated Li3N could absorb fast (3 min), 5.5 wt % of hydrogen at 230 °C, and that 3200 min was needed to absorb an additional 2.5 wt % of H2. In contrast, the Li3N preheated at 400 °C in a vacuum for 4.5 h absorbed only 3 wt % in 3 min at 230 °C but required only 300 min to absorb an additional 6.5 wt % of H2. Furthermore, during rehydrogenation after desorption, the pretreated Li3N could quickly absorb (3 min) 5.2 wt % of hydrogen, and this performance did not change with increasing hydrogenation−dehydrogenation cycle number. TPH and SEM investigations indicated that the higher performance of the preheated Li3N was due to its relatively large particle sizes.

Characterization of titanium based catalysts in the Li-N-H hydrogen storage system by X-ray absorption spectroscopy

“…Since in Chen et al's report [1], the Li-N-H compound has been paid much attention for one of the new hydrogen storage systems [2][3][4][5][6][7][8][9][10][11]. Lithium nitride absorbs and desorbs a large amount of hydrogen in the two consecutive reactions as follows: Li 3 N + 2H 2 ↔ Li 2 NH + LiH + H 2 ↔ LiNH 2 + 2LiH.…”

Observation of hydrogen absorption/desorption reaction processes in Li–Mg–N–H system by in-situ X-ray diffractmetry

“…Since then, many related studies have been reported all over the world [2][3][4][5][6][7][8][9][10][11][12][13][14]. Ichikawa (1) They claimed that the above dehydrogenation reaction is not a direct molecule-molecule reaction between LiNH 2 and LiH, but it can be expressed by an ammonia mediating model [7,15].…”

Hydrogen absorption properties of Li–Mg–N–H system

“…Since the hydrogen storage (H-storage) properties of the Li-N-H system was reported by Chen et al [1] as a new family of promising hydrogen storage materials, many relevant studies have been performed to understand and improve their H-storage properties all over the world [2][3][4][5][6][7][8][9][10][11][12][13]. As a result of those investigations, similar hydrogen storage systems i.e.…”