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  Remhof, A.; Friedrichs, O.; Buchter, F.; Mauron, Ph.; Kim, J.W.; Oh, K.H.; Buchsteiner, A.; Wallacher, D.; Züttel, A.: Hydrogen cycling behavior of LiBD₄/Al studied by in situ neutron diffraction. Journal of Alloys and Compounds 484 (2009), p. 654-659

10.1016/j.jallcom.2009.05.013

Abstract:
The preparation of Li11BD4 from Al11B2, LiD and D2 and several subsequent hydrogen sorption cycles according to 2LiD + AlB2 + 3D2 ↔ 2LiBD4 + Al starting from the desorbed state are investigated by in situ neutron diffraction. Absorption is carried out at T = 450 ◦ C and at p = 50 bar D2, while desorption is performed at T = 450 ◦ C using a back-pressure of 1 bar. Compared to the Al free system, the absorption is observed at much lower temperatures and pressures.We attribute the increased deuterium uptake to the enhanced chemical reactivity of the elemental boron released in the dissociation of AlB2. The desorption process on the other hand is similar to the desorption of pure LiBD4 and seems not to be influenced by the present aluminum. The hydrogen capacity decreases from cycle to cycle, due to an incomplete re-formation of AlB2. We attribute this to a phase separation of Al and B during the decomposition of LiBD4.