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

Wei Chen ¹Ya-Hui Sun ¹Tian Xu ¹Xue-Bin Yu ¹Guang-Lin Xia¹

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作者信息

1. Department of Materials Science, Fudan University, Shanghai 200433, China
折叠

Abstract

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.

Key words

Reversible hydrogen storage/Reactive hydride composites/Catalytic effects/Heterogeneous nucleation

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基金项目

National Key R&D Program of China(2020YFA0406204)

National Natural Science Foundation of China(U2130208)

National Natural Science Foundation of China(22279020)

National Natural Science Foundation of China(22109026)

National Natural Science Foundation of China(51971065)

National Natural Science Foundation of China(51901045)

National Natural Science Foundation of China(52071156)

science and Technology Commission of Shanghai Municipality(21ZR1407500)

science and Technology Commission of Shanghai Municipality(23ZR1406500)

Programs for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning()

出版年

2024

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

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