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Mechanochemical synthesis and dehydrogenation properties of Yb(AlH4)3

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Cao,  Zhijie
Advanced Energy Storage Materials and Devices Laboratory, School of Physics and Electronic-Electrical Engineering, Ningxia University;
Research Group Felderhoff, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Felderhoff,  Michael
Research Group Felderhoff, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Cao, Z., & Felderhoff, M. (2021). Mechanochemical synthesis and dehydrogenation properties of Yb(AlH4)3. International Journal of Hydrogen Energy, 46(52), 26437-26444. doi:10.1016/j.ijhydene.2021.05.132.


Cite as: https://hdl.handle.net/21.11116/0000-0009-16A3-6
Abstract
The facile synthesis of ytterbium tetrahydroaluminate Yb(AlH4)3 is conducted by a mechanochemical procedure under hydrogen atmosphere for the first time. Results show that the synthesized Yb(AlH4)3 remains as an amorphous state. The thermal decomposition of Yb(AlH4)3 goes through a four-stage pathway with several amorphous intermediate phases during the process. The first dehydrogenation step of Yb(AlH)3 presents a relatively low apparent activation energy of 99.6 kJ mol−1, and ninety percent of the hydrogen from this stage can be liberated within 20 min at 160 °C. Rehydrogenation tests above 160 °C and 14 MPa hydrogen pressure demonstrate the unsuccessful rehydrogenations of the first decomposition step due to the formation of a thermodynamically more stable compound YbHCl.