Characterization and Hydrogen Storage Capacity Analysis of Dip Coated Lithium Aluminium Hydride Thin Films

Abstract:

Complex metal hydrides are one of the most effective hydrogen storage materials due to their unique property to absorb and desorb hydrogen with the hydrogen storage capacity of about 5-7 wt%. In this study, lithium aluminium hydride (LiAlH₄) was coated on glass substrate using dip coating method. The coating conditions investigated were LiAlH₄ concentrations of 6 g/l, 10 g/l and 20 g/l and post-annealing time from 0 to 60 min. Phase and grain size of the deposited LiAlH₄ were analyzed using X-ray powder diffraction (XRD). Scanning electron microscope (SEM) was used for surface morphology analysis. The hydrogen storage capacity of the deposited thin films was analyzed using thermogravimetric analysis (TGA). The experimental results revealed that the phase of the deposited LiAlH₄ thin films on glass substrate were mixed with lithium aluminium hydroxide hydrate (LiAl₂(OH)₇·2H₂O) and lithium hexahydroaluminate (Li₃AlH₆). The intensity of the LiAl₂(OH)₇·2H₂O and LiAlH₄ peaks tends to decrease with increasing LiAlH₄ concentration and post-annealing time while the intensity of the Li₃AlH₆ peaks increased with increasing LiAlH₄ concentration and post-annealing time. The grain size was decreased with increasing LiAlH₄ concentration and post-annealing time. The smaller grain size the better the hydrogen storage capacity. The hydrogen storage capacity of the deposited LiAlH₄ thin film was increased from 0.124 wt % using LiAlH₄ concentration of 6 g/l without post-annealing to 1.675 wt % using LiAlH₄ concentration of 20 g/l with 60 min post-annealing time.

• Periodical: Materials Science Forum (Volume 1047)
• Pages: 90-96
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1047.90
• Online since: October 2021
• Authors: Chusak Choawarot, Vilailuck Siriwongrungson*, Janjira Hongrapipat, Shu Sheng Pang, Michael Messner
• Keywords: Dip Coating, Hydrogen Storage, Lithium Aluminium Hydride, Thin Film

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