Preparation and electrochemical performance of the N-doped hollow pitch-based activated carbon fibers as supercapacitor electrodes

YUE Dan; YANG Jian-xiao; SUN Bing; SHI Kui; ZHU Hui; LI Xuan-ke

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Article Navigation > New Carbon Mater. > 2020 > 35(1): 50-57

YUE Dan, YANG Jian-xiao, SUN Bing, SHI Kui, ZHU Hui, LI Xuan-ke. Preparation and electrochemical performance of the N-doped hollow pitch-based activated carbon fibers as supercapacitor electrodes. New Carbon Mater., 2020, 35(1): 50-57.

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Preparation and electrochemical performance of the N-doped hollow pitch-based activated carbon fibers as supercapacitor electrodes

1.
College of Materials Science and Engineering, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, China;
2.
School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430080, China

Funds: National Natural Science Foundation of China(U1864207).

Received Date: 2019-12-30
Accepted Date: 2020-04-02
Rev Recd Date: 2020-01-23
Publish Date: 2020-02-29

Abstract

Abstract

Mixtures of polyethyleneimine (PEI) and ethylene tar pitch (0, 15, 20, 30 wt% of PEI) were melt-spun, stabilized, carbonized and activated to prepare nitrogen-doped (N-doped) activated carbon fibers (ACFs). The morphology, porous structure and surface chemistry of the N-doped ACFs were characterized by N₂ adsorption, XPS and SEM. Their electrochemical performance as supercapacitor electrode materials was investigated. Results indicate that the specific surface area, pore volume and number of nitrogen-containing functional groups of the N-doped ACFs are much increased compared to undoped ACFs. PEI pyrolysis during the carbonization of the fibers leads to the formation of hollow N-doped ACFs that increases the utilization% of the surface area, resulting in a significant increase of the specific capacitance. When 20 wt% PEI was added, the specific surface area of the N-doped ACF reached 2 756 m²/g, its pore sizes ranged from 0.7 to 2 nm, and its specific capacitance reached 314 F/g at 0.5 A/g, which is much higher than that (194 F/g) of the undoped ACF.
- Pitch,
- Activated carbon fiber,
- Supercapacitor,
- Nitrogen-doped,
- Hollow structure

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