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Lotus rhizome-like S/N–C with embedded WS2 for superior sodium storage

Journal Article


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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.

Publication Date


  • 2019

Citation


  • Li, X., Sun, Y., Xu, X., Wang, Y., Chou, S., Cao, A., Chen, L. & Dou, S. (2019). Lotus rhizome-like S/N–C with embedded WS2 for superior sodium storage. Journal of Materials Chemistry A, 7 (45), 25932-25943.

Scopus Eid


  • 2-s2.0-85075268465

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4966&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3911

Has Global Citation Frequency


Number Of Pages


  • 11

Start Page


  • 25932

End Page


  • 25943

Volume


  • 7

Issue


  • 45

Place Of Publication


  • United Kingdom

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.

Publication Date


  • 2019

Citation


  • Li, X., Sun, Y., Xu, X., Wang, Y., Chou, S., Cao, A., Chen, L. & Dou, S. (2019). Lotus rhizome-like S/N–C with embedded WS2 for superior sodium storage. Journal of Materials Chemistry A, 7 (45), 25932-25943.

Scopus Eid


  • 2-s2.0-85075268465

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4966&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3911

Has Global Citation Frequency


Number Of Pages


  • 11

Start Page


  • 25932

End Page


  • 25943

Volume


  • 7

Issue


  • 45

Place Of Publication


  • United Kingdom