Role of Rare-Earth Alloys in Lithium Borohydride Regeneration from Hydrous Lithium Metaborate

Yongyang Zhu (Corresponding Author), Shaoyang Shen, Xu-Sheng Yang, Liming Zeng, Chi Pong Tsui, Zhenglong Xu, Qing Zhou, Renheng Tang, Kang Cheung Chan (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review


Lithium borohydride (LiBH4) 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 LiBH4 by ball milling hydrous lithium metaborate (LiBO2·2H2O) with low-cost Mg-based alloys, instead of MgH2, under ambient conditions. An effective strategy is developed to improve the regeneration kinetics of LiBH4 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 LiBO2·2H2O-CeMg12 system. The optimized regeneration of LiBH4 is believed to be efficient and economical since it utilizes an intrinsic hydrogen source in LiBO2·2H2O and cheap reducing agents. Our finding is expected to enable a wide deployment of LiBH4 for hydrogen storage.
Original languageEnglish
Pages (from-to)8931-8938
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Issue number24
Early online date8 Jun 2023
Publication statusPublished - 19 Jun 2023


  • hydrogen storage
  • lithium borohydride
  • regeneration
  • rear earth
  • lithium metaborate


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