Journal
NANO ENERGY
Volume 62, Issue -, Pages 239-249Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.05.040
Keywords
Bimetallic sulfides; MOFs; DFT calculation; Sodium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [51702272]
- Natural Science Foundation project of Fujian Province, China [2018J01519]
- Talents Introduction Program of Xiamen University of Technology, China [E2016144]
- Natural Science Foundation of Beijing Municipality [L172036]
- Joint Funds of the Equipment Pre-Research and Ministry of Education
- China [6141A020225]
- Science and Technology Beijing 100 Leading Talent Training Project, China
- Beijing Municipal Science and Technology Project, China [Z161100002616039]
- Fundamental Research Funds for the Central Universities, China [2016JQ01, 2017ZZD02]
- NCEPU Double First-Class Graduate Talent Cultivation Program, China
- Par-Eu Scholars Program, China
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Transition metal sulfides (TMS) are considered as anode candidates for sodium-ion batteries (SIBs) due to the high theoretical specific capacity and natural abundance. Herein, Co3S4@1T MoS2/NC-L hierarchical nanosheets, in which bimetallic sulfides are integrated into N-doped carbon, has been designed and prepared via calcination of leaf-like Co-ZIF (ZIF-L) precursor followed by hydrothermal sulfuration reaction. When evaluated as anode for SIBs, the Co3S4@1T MoS2/NC-L hierarchical nanosheets offer enhanced pseudocapacitance effect, fast Na+ kinetics in the heterogenous interface of bimetallic sulfides and small polarization, achieving an delightful reversible capacity of 595 mAh g(-1) at 0.1 A g(-1) and rate capability of 338 mA h g(-1) at 5 A g(-1). Moreover, the fine structural stability and mutual affinity of bimetallic sulfides under high cutoff voltage hinder the loss of sodium polysulfide during conversion reaction, promoting the long cycling stability of hierarchical nanosheets. Such bimetallic sulfides/N-doped carbon hierarchical nanosheet sheds new light on the construction of efficient anode material for SIBs.
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