Abstract
The high-pressure technique is a fundamental tool for realizing novel phase transitions, chemical reactions, and other exotic phenomena. Hydrogenation is one example of a high-pressure reaction; at high pressures of several gigapascals, hydrogen becomes chemically active and reacts with metals and alloys to form hydrides. This paper covers a high-pressure study of the hydrogenation process and the synthesis of hydrides using a cubic-type multi-anvil apparatus. The experimental details of a hydrogenation cell assembly, high-temperature and high-pressure generation, and an in situ observation technique are presented. These experiments are conducted with the aid of in situ synchrotron radiation X-ray diffraction measurements operated in an energy-dispersive mode in the conventional manner for time-resolved measurements and a newly developed angle-dispersive mode for observation of the crystal growth process during formation of metal hydrides. Two successful cases of high-pressure hydrogenation are presented: aluminum hydride, AlH3, and an aluminum-based alloy hydride, Al2CuH x , which are potential candidates for hydrogen storage materials.
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Acknowledgments
This work was partially supported by New Energy and Industrial Technology Development Organization (NEDO) under “Advanced Fundamental Research Project on Hydrogen Storage Materials” and “Feasibility Study on Advanced Hydrogen Storage Materials for Automotive Applications (2012)”, by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) under the “Photon and Quantum Basic Research Coordinated Development Program”, and by Japan Society for the Promotion of Science (JSPS) KAKENHI (25220911, 24241032, and 25420725). The synchrotron radiation experiments were performed at BL14B1 of SPring-8 with the approval of Japan Atomic Energy Agency (JAEA) (2011B3602 and 2012B3602).
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SPECIAL TOPIC: High Pressure Physics
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Saitoh, H., Machida, A. & Aoki, K. Synchrotron X-ray diffraction techniques for in situ measurement of hydride formation under several gigapascals of hydrogen pressure. Chin. Sci. Bull. 59, 5290–5301 (2014). https://doi.org/10.1007/s11434-014-0543-8
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DOI: https://doi.org/10.1007/s11434-014-0543-8