期刊
JOURNAL OF POWER SOURCES
卷 451, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.227744
关键词
Sodium-ion capacitors; Sulfur doped Nb2O5 quantum dots; Oxygen vacancies; Free-standing anode; Nitrogen and sulfur co-doping
资金
- National Natural Science Foundation of China [21471093, 51772182]
- 111 Project
- Fundamental Research Funds for the Central Universities [GK201801010, GK201903050]
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JQ-092]
- China Postdoctoral Science Foundation
Sodium-ion supercapacitors (SICs) have attracted increasing scientific attention for mid-to-large-scale energy storage applications due to their high energy and power densities. Herein, an ultra-flexible and free-standing hybrid anode material consisting of sulfur-doped Nb2O5 quantum dots (similar to 3 nm) uniformly embedded within nitrogen and sulfur co-doped microporous carbon nanofiber (S-Nb2O5@NS-PCNF) is successfully fabricated by electrospinning followed by a sulfidation treatment. The designed 3D microporous network not only offers a continuous conducting framework for electron-transport, but also provides more accessible channels for rapid Na-ions migration. Furthermore, the S-doping induced anionic oxidation of Nb2O5 (O2-2--> O-) and S-doping in microporous carbon nanofibers result in the formation of numerous oxygen vacancies and defects for enhanced electrical conductivity and surface pseudocapacitance. In particular, the oxygen vacancies induced by the S-doping on Nb2O5 have been firstly demonstrated. This S-Nb2O5@NS-PCNF film electrode exhibits superior rate capability (124 mAh g(-1) at 4 A g(-1)) and ultralong cycling life (173 mAh g(-1) after 10000 cycles at 2 A g(-1)). The SIC full-cell comprising a S-Nb2O5@NS-PCNF anode and an activated carbon cathode delivers a maximum energy density of 112 Wh kg(-1) at 80 W kg(-1) and a ultralong-term cycling stability. This strategy provides a promising application for highly efficient energy storage systems.
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