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Catalytic effects of metal (Ti) addition on the dehydrogenation properties of aluminium hydride
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1  Energy Storage Research Group, Faculty Of Ocean Engineering Technology, Universiti Malaysia Terengganu
Academic Editor: Yung Shin

Abstract:

Due to its high hydrogen capacity (10.1 wt.%), aluminium hydride (AlH3) is considered as a possible material for on-board hydrogen storage applications. However, several factors, such as a high decomposition temperature and sluggish desorption kinetics, limit this benefit and render this material unmarketable. To overcome these limitations, numerous studies have been conducted, such as using mechanical ball milling to reduce the particle size and adding dopants or catalysts. In this work, the effect of metal (Ti) on the dehydrogenation properties of AlH3 has been investigated for the first time. The results show that Ti lowered the initial decomposition temperature and sped up the process of AlH3 desorption. The 10 wt.% Ti-doped AlH3 sample's initial decomposition temperature dropped from 145 °C to 120 °C compared to that of as-received AlH3. For the desorption kinetic measurements at 100 °C, the 10 wt.% Ti-doped AlH3 sample could desorb about 4.0 wt.% of H2 in 20 min compared to 0.1 wt.% for the as-received AlH3. After Ti was added, the activation energy for the dehydrogenation process of AlH3 that was determined by Kissinger analysis decreased. From the X-ray diffraction analysis, we found that Ti did not react with AlH3 during the mechanical milling and heating (desorption) processes. Ti is believed to play a catalytic role by inducing Ti-H interaction and weakening Al-H bonding, thus improving the dehydrogenation properties of AlH3.

Keywords: Hydrogen storage; aluminium hydride; catalytic effect; metals
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