Mg(BH_(4))_(2) with several polymorphs,known as a high capacity(14.9 wt.%)hydrogen storage material,has become more intriguing due to the recently found new functions of gas physisorption and ionic conduc-tivity.Here ...Mg(BH_(4))_(2) with several polymorphs,known as a high capacity(14.9 wt.%)hydrogen storage material,has become more intriguing due to the recently found new functions of gas physisorption and ionic conduc-tivity.Here we review the state-of-the-art on the energy related functions of Mg(BH_(4))_(2).Mg(BH_(4))_(2) tends to form the stable intermediate[B_(12)H_(12)]^(2−) when the dehydrogenation temperature is above 400℃,the strong B-B bonding of which makes the rehydrogenation condition very harsh.In contrast,lower borane intermediate[B_(3)H_(8)]2−facilitates the rehydrogenation even at a mild condition of 100℃,suggesting the possibility of reversible hydrogen storage in Mg(BH_(4))_(2).The porous polymorphγ-Mg(BH_(4))_(2) shows attrac-tive gas adsorption properties in view of its unique hydridic surface and pore shape,and potentially can be applied in hydrogen adsorption and Kr/Xe selectivity.A new diffraction-based adsorption methodology was developed to characterize adsorption thermodynamics and kinetics ofγ-Mg(BH_(4))_(2),providing a novel idea for the characterization of crystalline porous materials.Moreover,the potential of Mg(BH_(4))_(2) as an electrolyte is discussed in the last part.Mg(BH_(4))_(2)·THF/DME acts as a liquid electrolyte in Mg-batteries,while anion substituted or neutral molecule derivatives of Mg(BH_(4))_(2) can act as solid-state electrolyte.展开更多
基金This work was financially supported by the National Natural Science Foundation of China Projects(Nos.52171205,21975168 and 52101249)the Anhui Provincial Natural Science Foundation for Ex-cellent Youth Scholars(No.2108085Y16)+4 种基金the Youth Science and Technology Fund Project of China Machinery Industry Group Co.,Ltd.(No.QNJJ-ZD-2022-01)the Natural Science Foundation of Anhui Province(No.2108085QE191)This work was also sup-ported by the Independent Research Fund Denmark for Technology and Production(No.9041-00226B)by FNRS(PDR T.0169.13,EQP U.N038.13,J.0164.17,CdR J.0073.20)the CommunautéFrançaise de Belgique under Grant ARC 18/23-093.
文摘Mg(BH_(4))_(2) with several polymorphs,known as a high capacity(14.9 wt.%)hydrogen storage material,has become more intriguing due to the recently found new functions of gas physisorption and ionic conduc-tivity.Here we review the state-of-the-art on the energy related functions of Mg(BH_(4))_(2).Mg(BH_(4))_(2) tends to form the stable intermediate[B_(12)H_(12)]^(2−) when the dehydrogenation temperature is above 400℃,the strong B-B bonding of which makes the rehydrogenation condition very harsh.In contrast,lower borane intermediate[B_(3)H_(8)]2−facilitates the rehydrogenation even at a mild condition of 100℃,suggesting the possibility of reversible hydrogen storage in Mg(BH_(4))_(2).The porous polymorphγ-Mg(BH_(4))_(2) shows attrac-tive gas adsorption properties in view of its unique hydridic surface and pore shape,and potentially can be applied in hydrogen adsorption and Kr/Xe selectivity.A new diffraction-based adsorption methodology was developed to characterize adsorption thermodynamics and kinetics ofγ-Mg(BH_(4))_(2),providing a novel idea for the characterization of crystalline porous materials.Moreover,the potential of Mg(BH_(4))_(2) as an electrolyte is discussed in the last part.Mg(BH_(4))_(2)·THF/DME acts as a liquid electrolyte in Mg-batteries,while anion substituted or neutral molecule derivatives of Mg(BH_(4))_(2) can act as solid-state electrolyte.
