Aluminum-based alloy hydrides have been explored as lightweight hydrogen storage materials. A few aluminum-based alloys have been reported. For example, F. Gingle et al. have reported SrAl₂H₂ Zintl phase hydride [1]. Y₃Al₂H_6.5 has been synthesized by hydrogenating Y₃Al₂ alloy [2]. These hydrides have been synthesized near ambient pressure. Novel aluminum-alloy hydrides are expected to be synthesized under high pressure and high temperature in which conditions hydrogen becomes extremely reactive and it can reacts with passivated aluminum [3]. In the present study, hydrogenation reactions of aluminum-based alloys were investigated under high pressure and high temperature. The reactions were monitored by in-situ synchrotron radiation x-ray diffraction measurements to clarify its reaction process and to optimize its synthetic conditions.
High-pressure and high-temperature conditions were generated using a cubic-anvil-type multi-anvil high pressure apparatus. Aluminum-based intermetallic alloys were pressurized and immersed in hydrogen fluid at high temperatures to form their hydrides. Hydrogenation reactions were monitored by an in-situ measurement system installed in the beamline BL14B1 at SPring-8.
It was clarified that Al₃Ti intermetallic alloy was hydrogenated to form Al₃TiH_x (x~0.4) interstitial hydride at 10 GPa and 625°C. While Al₃Ti alloy was successfully hydrogenated, other aluminum-based alloys such as Al-Ga, Al-Si and Al-Mg were not hydrogenated. In the case of these alloys, pure AlH3 was formed by the high-pressure and high-temperature treatment. The formation mechanism of aluminum-base alloy hydride are being investigated using the in-situ measurement system to explore other novel aluminum-based alloy hydrides.
Part of this work was supported by New Energy and Industrial Technology Development Organization (NEDO), "Advanced Fundamental Research Project on Hydrogen Storage Materials" and "Feasibility Study on Advanced Hydrogen Storage Materials for Automotive Applications (2012)."

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