期刊
ENERGIES
卷 8, 期 9, 页码 9173-9190出版社
MDPI
DOI: 10.3390/en8099173
关键词
cobalt additives; hydrogen storage; in-situ; magnesium borohydride (Mg(BH4)(2)); X-ray absorption spectroscopy (XAS); synchrotron X-ray diffraction
资金
- European Fuel Cells and Hydrogen [303428]
- SYNKNOYT program in the Research Council of Norway
- NORTEM within the program INFRASTRUCTURE of the Research Council of Norway (RCN) [197405]
- RCN
- NTNU
- UiO
- SINTEF
Magnesium borohydride (Mg(BH4)(2)) is one of the most promising hydrogen storage materials. Its kinetics of hydrogen desorption, reversibility, and complex reaction pathways during decomposition and rehydrogenation, however, present a challenge, which has been often addressed by using transition metal compounds as additives. In this work the decomposition of Mg(BH4)(2) ball-milled with CoCl2 and CoF2 additives, was studied by means of a combination of several in-situ techniques. Synchrotron X-ray diffraction and Raman spectroscopy were used to follow the phase transitions and decomposition of Mg(BH4)(2). By comparison with pure milled Mg(BH4)(2), the temperature for the epsilon phase transition in the samples with CoF2 or CoCl2 additives was reduced by 10-45 degrees C. In-situ Raman measurements showed the formation of a decomposition phase with vibrations at 2513, 2411 and 766 cm(-1) in the sample with CoF2. Simultaneous X-ray absorption measurements at the Co K-edge revealed that the additives chemically transformed to other species. CoF2 slowly reacted upon heating till similar to 290 degrees C, whereas CoCl2 transformed drastically at similar to 180 degrees C.
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