No abstract

No abstract

No abstract

Lithium borohydride (LiBH 4 ) is a promising hydrogen storage material, but the irreversibility of hydrolysis and the high cost of regeneration have severely restrained its commercial applications. Herein, we reported a cost-effective method to regenerate LiBH 4 by ball milling hydrous lithium metaborate (LiBO 2 •2H 2 O) with low-cost Mg-based alloys, instead of MgH 2 , under ambient conditions. An effective strategy is developed to improve the regeneration kinetics of LiBH 4 by introducing the light rare-earth metals into Mg to facilitate the breakage of B−O and conversion of H + into H − . A yield of 40% can be achieved for a relatively short ball milling duration (10 h) for the LiBO 2 •2H 2 O-CeMg 12 system. The optimized regeneration of LiBH 4 is believed to be efficient and economical since it utilizes an intrinsic hydrogen source in LiBO 2 •2H 2 O and cheap reducing agents. Our finding is expected to enable a wide deployment of LiBH 4 for hydrogen storage.