期刊
COMPOSITES PART B-ENGINEERING
卷 224, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109246
关键词
Composite nanofibers; High power density; Extraordinary cycling stability; Electrospinning; Flexible supercapacitors
资金
- National Natural Science Foundation of China [51674068, 51874079, 51804035, 11775226]
- Natural Science Foundation of Hebei Province [E2018501091, E2020501001]
- Hebei Province Key Research and Development Plan Project [19211302D]
- Fundamental Research Funds for the Central University [N182304018, N2023040, N182304015]
- Natural Science Foundation of Liaoning Province [2019-MS-110]
- Research Project on the Distribution of Heavy Metals in Soil and Comprehensive Utilization Technology of Tailings in Typical Iron Tailing Reservoir Areas of Hebei Province [802060671901]
The study utilized in-situ carbon coating technology to embed sulfide-loaded MXene in carbon nanofibers, improving sulfide conductivity and ion transfer rate. The resulting hybrid membrane offers a solution to the problems of poor sulfide conductivity and cyclic stability through its unique structure and characteristics.
In this study, in-situ carbon coating technology was used to embed the sulfide-loaded MXene in the carbon nanofibers through electrospinning to improve the sulfide conductivity and ion transfer rate. Polyacrylonitrile (PAN) with a high carbon conversion rate was used as carbon nanofiber, while polyvinylpyrrolidone (PVP) with a low carbon conversion rate was used as a pore-forming sacrificial agent. PAN-PVP-based porous carbon nanofibers (PCNF) with good meso/macropore structure were prepared via a thermally induced phase separation process. FeCo2S4 nanoparticles and ultra-thin Ti3C2Tx MXene were uniformly fixed in PCNF in situ, and a flexible hybrid film was prepared as the electrode material of supercapacitors (FeCo2S4/MXene/PCNF). The FeCo2S4/ MXene/PCNF hybrid membrane inherits a three-dimensional pore structure and hierarchical PCNF nanostructure. It can provide continuous channels for the rapid electrolyte diffusion, thereby obtaining electrochemically active FeCo2S4 nanoparticles. Moreover, carbon nanofibers can act as a conductive core for providing effective electron transport for the rapid Faraday redox reaction of the FeCo2S4 sheath or as a buffer matrix for reducing local volume expansion/contraction during long-term cycling. Therefore, the optimized FeCo2S4/ MXene/PCNF hybrid membrane has excellent cyclic stability, which fundamentally solves the problems of poor sulfide conductivity and cyclic stability.
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