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

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

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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.

Hydrogen storageLithium borohydrideMagnesium hydrideNb2CMXene

Li-Wen Lu、Hui Luo、Guang-Xu Li、Yun Li、Xin-Hua Wang、Cun-Ke Huang、Zhi-Qiang Lan、Wen-Zheng Zhou、Jin Guo、Mohammad Ismail、Hai-Zhen Liu

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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

School of Mechanical and Electrical Engineering,Quzhou College of Technology,Quzhou 324000,China

Department of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China

Faculty of Ocean Engineering Technology and Informatics,Universiti Malaysia Terengganu,21030 Kuala Nerus,Terengganu,Malaysia

Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Nankai University,Tianjin 300071,China

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Science and Technology Department of Guangxi Zhuang AutonomousNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaQuzhou Science and Technology Project

GuiKeAD212380225200107922379030522610382022K103

2024

10.1007/s12598-023-02489-5

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(3)
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