首页|Enhancing reversible hydrogen storage performance of 2LiBH4-MgH2 via in-situ building heterogeneous nucleation sites

Enhancing reversible hydrogen storage performance of 2LiBH4-MgH2 via in-situ building heterogeneous nucleation sites

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2LiBH4-MgH2 composite is one of the most attractive reactive hydride composites with a theoretic hydrogen capacity of 10.8 wt％.However,the large nucleation restriction of MgB2 during the second step of dehydrogenation results in sluggish hydrogen storage kinetics and high operating temperature,which hinders its practical application as on-board hydrogen storage mate-rials.Herein,Al3Ti doped Al nanoparticles(AT NPs)are prepared by a facile chemical reduction reaction to improve the hydrogen storage performance of 2LiBH4-MgH2 composite.During the initial H2 desorption process,MgAlB4 and TiB2 that have identical crystal structure and low d-value mismatch with MgB2 resulting from the reaction between AT NPs and 2LiBH4-MgH2 composite serve as effective nucleation sites for the formation of MgB2.As a result,the apparent activation energy of the two-step H2 desorption of AT NPs doped 2LiBH4-MgH2 composite are notably decreased to(110.0±5.9)and(119.6±1.4)kJ·mol-1,which is 55.5 and 33.5 kJ.mol-1 lower than that of the undoped sample.More importantly,a reversible hydrogen storage capacity of 9.2 wt％after 10 cycles of H2 desorption and adsorption could be achieved,corresponding to a capacity retention rate of 99％.The building of reactive bimetallic catalyst towards in situ formation of heterogeneous nucleation sites provides a new strategy for improving the hydrogen storage performance of reactive hydride composites.

Reversible hydrogen storageReactive hydride compositesCatalytic effectsHeterogeneous nucleation

Wei Chen、Ya-Hui Sun、Tian Xu、Xue-Bin Yu、Guang-Lin Xia

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Department of Materials Science, Fudan University, Shanghai 200433, China

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of Chinascience and Technology Commission of Shanghai Municipalityscience and Technology Commission of Shanghai MunicipalityPrograms for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning

2020YFA0406204U2130208222790202210902651971065519010455207115621ZR140750023ZR1406500

2024

10.1007/s12598-024-02762-1

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(9)
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