Expanded MoSe2 Nanosheets Vertically Bonded on Reduced Graphene Oxide for Sodium and Potassium-Ion Storage

被引:93
|
作者
Chong, Shaokun [5 ,6 ]
Wei, Xuedong [1 ]
Wu, Yifang [2 ]
Sun, Lan [3 ]
Shu, Chengyong [4 ]
Lu, Qianbo [5 ,6 ]
Hu, Yingzhen [5 ,6 ]
Cao, Guozhong [7 ]
Huang, Wei [5 ,6 ]
机构
[1] Shanxi Normal Univ, Sch Chem & Mat Sci, Key Lab Magnet Mol & Magnet Informat Mat, Minist Educ, Linfen 041004, Shanxi, Peoples R China
[2] Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China
[3] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
[4] Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Peoples R China
[5] Northwestern Polytech Univ, Xian Inst Flexible Elect, Frontiers Sci Ctr Flexible Elect, Xian 710072, Peoples R China
[6] Northwestern Polytech Univ, Xian Inst Biomed Mat & Engn, Xian 710072, Peoples R China
[7] Univ Washington, Dept Mat & Engn, Seattle, WA 98195 USA
基金
中国国家自然科学基金;
关键词
sodium-ion battery; potassium-ion battery; anode material; chemical bond; molybdenum selenide;
D O I
10.1021/acsami.0c22430
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The cost-efficient and plentiful Na and K resources motivate the research on ideal electrodes for sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs). Here, MoSe2 nano-sheets perpendicularly anchored on reduced graphene oxide (rGO) are studied as an electrode for SIBs and PIBs. Not only does the graphene network serves as a nucleation substrate for suppressing the agglomeration of MoSe2 nanosheets to eliminate the electrode fracture but also facilitates the electrochemical kinetics process and provides a buffer zone to tolerate the large strain. An expanded interplanar spacing of 7.9 angstrom is conducive to fast alkaline ion diffusion, and the formed chemical bondings (C-Mo and C-O-Mo) promote the structure integrity and the charge transfer kinetics. Consequently, MoSe2@5%rGO exhibits a reversible specific capacity of 458.3 mAh.g(-1) at 100 mA.g(-1), great cyclability with a retention of 383.6 mAh.g(-1) over 50 cycles, and excellent rate capability (251.3 mAh.g(-1) at 5 A.g(-1)) for SIBs. For PIBs, a high first specific capacity of 365.5 mAh.g(-1) at 100 mA.g(-1) with a low capacity fading of 51.5 mAh.g(-1) upon 50 cycles and satisfactory rate property are acquired for MoSe2@10%rGO composite. Ex situ measurements validate that the discharge products are Na2Se for SIBs and K5Se3 for PIBs, and robust chemical bonds boost the structure stability for Na- and K-ion storage. The full batteries are successfully fabricated to verify the practical feasibility of MoSe2@5%rGO composite.
引用
收藏
页码:13158 / 13169
页数:12
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