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Lotus rhizome-like S/N–C with embedded WS2 for superior sodium storage
- Source :
- Journal of Materials Chemistry A. 7:25932-25943
- Publication Year :
- 2019
- Publisher :
- Royal Society of Chemistry (RSC), 2019.
-
Abstract
- Sodium-ion batteries (SIBs) hold great promise as power sources because of their low cost and decent electrochemical behavior. Nevertheless, the poor rate performance and long-term cycling capability of anode materials in SIBs still impede their practical application in smart grids and electric vehicles. Herein, we design a delicate method to embed WS2 nanosheets into lotus rhizome-like heteroatom-doped carbon nanofibers with abundant hierarchical tubes inside, forming WS2@sulfur and nitrogen-doped carbon nanofibers (WS2@S/N–C). The WS2@S/N–C nanofibers exhibit a large discharge capacity of 381 mA h g−1 at 100 mA g−1, excellent rate capacity of 108 mA h g−1 at 30 A g−1, and a superior capacity of 175 mA h g−1 at 5 A g−1 after 1000 cycles. The excellent performance of WS2@S/N–C is ascribed to the synergistic effects of WS2 nanosheets, contributing to larger interlayer spacing, and the stable lotus rhizome-like S/N–C nanofiber frameworks which alleviate the mechanical stress. Moreover, the WS2@S/N–C electrode shows obvious pseudocapacitive properties at 1 mV s−1 with a capacitive contribution of 86.5%. In addition, density functional theory calculations further indicate that the WS2@S/N–C electrode is very favorable for Na storage. This novel synthetic strategy is a promising method for synthesizing other electrode materials for rechargeable batteries in the future.
- Subjects :
- Electrode material
Materials science
Renewable Energy, Sustainability and the Environment
Carbon nanofiber
Sodium
chemistry.chemical_element
02 engineering and technology
General Chemistry
021001 nanoscience & nanotechnology
Electrochemistry
7. Clean energy
Anode
Chemical engineering
chemistry
Nanofiber
Electrode
General Materials Science
Density functional theory
0210 nano-technology
Subjects
Details
- ISSN :
- 20507496 and 20507488
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry A
- Accession number :
- edsair.doi...........8dce7a5d849a442c06b6066d91446bbd