(236d) Hydrogen Absorption/Desorption Study over LI-B-N-H Quaternary System

A series of Li-B-N-H quaternary hydrides were synthesis by ball milling the mixture of LiNH2-LiH with LiBH4 and tested for hydrogen storage by high pressure differential scanning calorimeter (HP-DSC), temperature programmed desorption (TPD), pressure composition isothermal (PCI). We found that an optimized composition is critical for low temperature hydrogen absorption and desorption. Over some of the compositions, the onset temperature for hydrogen release is about 50oC, and the TPD peak centers at about 150oC, which is about 100oC lower than that of LiNH2-LiH mixture. Notably, no ammonia is released up to 400oC over these systems. X-ray diffraction results over some of the compositions are also included and discussed.