Layered niobium carbide enabling excellent kinetics and cycling stability of Li-Mg-B-H hydrogen storage materialLayered niobium carbide enabling excellent kinetics

Li-Wen Lu ¹Hui Luo ¹Guang-Xu Li ¹Yun Li ²Xin-Hua Wang ³Cun-Ke Huang ¹Zhi-Qiang Lan ¹Wen-Zheng Zhou ¹Jin Guo ¹Mohammad Ismail ⁴Hai-Zhen Liu⁵

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作者信息

1. Guangxi Novel Battery Materials Research Center of Engineering Technology,Guangxi Colleges and Universities Key Laboratory of Blue Energy and Systems Integration,School of Physical Science and Technology,Guangxi University,Nanning 530004,China;State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures,Nanning 530004,China
2. School of Mechanical and Electrical Engineering,Quzhou College of Technology,Quzhou 324000,China
3. Department of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China
4. Faculty of Ocean Engineering Technology and Informatics,Universiti Malaysia Terengganu,21030 Kuala Nerus,Terengganu,Malaysia
5. Guangxi Novel Battery Materials Research Center of Engineering Technology,Guangxi Colleges and Universities Key Laboratory of Blue Energy and Systems Integration,School of Physical Science and Technology,Guangxi University,Nanning 530004,China;State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures,Nanning 530004,China;Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Nankai University,Tianjin 300071,China
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Abstract

The Li-Mg-B-H composite(2LiBH4+MgH2)has a high capacity of 11.4 wt％as a hydrogen storage material.However,the slow kinetics and poor cycling stability severely restrict its practical applications.In this work,a layered Nb2C MXene was first synthesized and then introduced to tailor the kinetics and cycling stability of the Li-Mg-B-H composite.The milled 2LiH+MgB2 composites were initially hydrogenated to obtain the 2LiBH4+MgH2 composites.The 2LiBH4+MgH2+5 wt％Nb2C can release 9.0 wt％H2 in 30 min at 400 ℃,while it is only 2.7 wt％for the undoped 2LiBH4+MgH2.The dehydrogenation activation energies of MgH2 and LiBH4 are 123 and 154 kJ·mol-1 respectively for the 5 wt％Nb2C-doped composite,lower than the undoped composite(164 and 165 kJ·mol-1).The 2LiBH4+MgH2+5 wt％Nb2C possesses excellent cycling stabil-ity,with the reversible capacity only slightly reduced from 9.4 wt％for the 1st cycle to 9.3 wt％for the 20th cycle.Nb2C keeps stable in the composite and acts as an efficient catalyst for the Li-Mg-B-H composite.It is believed that both the layered structure and the active Nb element con-tribute to the enhanced hydrogen storage performances of the Li-Mg-B-H composite.This work confirms that the Nb2C MXene with layered structure has a significant enhancing impact on the Li-Mg-B-H hydrogen storage materials,which is different from the bulk NbC.

Key words

Hydrogen storage/Lithium borohydride/Magnesium hydride/Nb2C/MXene

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基金项目

Science and Technology Department of Guangxi Zhuang Autonomous(GuiKeAD21238022)

National Natural Science Foundation of China(52001079)

National Natural Science Foundation of China(22379030)

National Natural Science Foundation of China(52261038)

Quzhou Science and Technology Project(2022K103)

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

参考文献量76

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