期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 11, 页码 13158-13169出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c22430
关键词
sodium-ion battery; potassium-ion battery; anode material; chemical bond; molybdenum selenide
资金
- Fundamental Research Funds for the Central Universities [G2020KY0534]
- National Natural Science Foundation of China [51901187]
- Natural Science Basic Research Program of Shaanxi [2019JQ-612]
In this study, MoSe2 nano-sheets anchored on reduced graphene oxide were successfully prepared as electrodes for sodium-ion batteries and potassium-ion batteries. The electrodes exhibited good reversible specific capacity, cycling stability, and rate capability, with enhanced structural stability through chemical bonds.
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.
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