Destabilization and regeneration of LiBH4 using N-containing hydrocarbon based polymers for hydrogen storage

摘要

Two N-containing hydrocarbon based polymers polyacrylonitrile (PAN) and polyaniline (PANI) were found to be able to destabilize LiBH4, a potential hydrogen storage material, resulting in larger hydrogen capacities of more than 10 wt% with peak dehydrogenation temperatures around 344 degrees C. The results suggest that a co-destabilization effect was achieved through the interaction of BeH and CeH bonds, which was further enhanced due to the presence of nitrogen atoms in polymers. After rehydrogenation of the dehydrogenated products, LiBH4 was found to be regenerated to a large extent in both of the LiBH4+polymer composites. Detailed analysis including XRD, FTIR, DSC-TG-MS, HRTEM, Raman, XPS and solid-state B-11 MAS NMR was performed to elucidate the dehydrogenation and rehydrogenation mechanisms in these composites. The results provide considerable information about interaction mechanisms among BeH, CeH, N-H and C N bonds and also shed lights on the enhancement of LiBH4 dehydrogenation and reversibility. (C) 2017 Elsevier B. V. All rights reserved.