Enhanced reversible hydrogen storage properties of wrinkled graphene microflowers confined LiBH_(4) system with high volumetric hydrogen storage capacity  

作　　者：Zhenglong Li Kaicheng Xian Hao Chen Mingxia Gao Shanqing Qu Meihong Wu Yaxiong Yang Wenping Sun Chao Gao Yongfeng Liu Xin Zhang Hongge Pan 

机构地区：[1]Institute of Science and Technology for New Energy,Xi'an Technological University,Xi'an,710021,PR China [2]State Key Laboratory of Silicon and Advanced Semiconductor Materials,Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province,School of Materials Science and Engineering,Zhejiang University,Hangzhou,310027,PR China [3]Department of Polymer Science and Engineering,MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Zhejiang University,Hangzhou,310027,PR China

出　　处：《Materials Reports(Energy)》2024年第1期79-88,共10页材料导报（能源）（英文）

基　　金：supported by National Key Research and Development Program of China(2021YFB4000602);National Natural Science Foundation of PR China(Nos.52071287,52072342,52271227);National Outstanding Youth Foundation of China(No.52125104);Natural Science Foundation of Zhejiang Province,PR China(No.LZ23E010002);Young Talent Fund of Association for Science and Technology in Shaanxi,China(No.20220456);Young Star Project of Science and Technology of Shaanxi Province(2022KJXX-43).

摘　　要：LiBH_(4)with high hydrogen storage density,is regarded as one of the most promising hydrogen storage materials.Nevertheless,it suffers from high dehydrogenation temperature and poor reversibility for practical use.Nanoconfinement is effective in achieving low dehydrogenation temperature and favorable reversibility.Besides,graphene can serve as supporting materials for LiBH_(4)catalysts and also destabilize LiBH_(4)via interfacial reaction.However,graphene has never been used alone as a frame material for nanoconfining LiBH_(4).In this study,graphene microflowers with large pore volumes were prepared and used as nanoconfinement framework material for LiBH_(4),and the nanoconfinement effect of graphene was revealed.After loading 70 wt%of LiBH_(4) and mechanically compressed at 350 MPa,8.0 wt% of H2 can be released within 100 min at 320C,corresponding to the highest volumetric hydrogen storage density of 94.9 g H2 L^(-1)ever reported.Thanks to the nanoconfinement of graphene,the rate-limiting step of dehydrogenation of nanoconfined LiBH_(4) was changed and its apparent activation energy of the dehydrogenation(107.3 kJ mol^(-1))was 42%lower than that of pure LiBH_(4).Moreover,the formation of the intermediate Li_(2)B_(12)H_(12) was effectively inhibited,and the stable nanoconfined structure enhanced the reversibility of LiBH_(4).This work widens the understanding of graphene's nanoconfinement effect and provides new insights for developing high-density hydrogen storage materials.

关 键 词：Hydrogen storage LiBH_(4) NANOCONFINEMENT GRAPHENE High capacity 

分 类 号：TB34[一般工业技术—材料科学与工程]