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Preparation of polyimide-based activated carbon fibers and their application as the electrode materials of electric double-layer capacitors

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(6), pp.1653-1666
  • DOI : 10.1007/s42823-024-00705-5
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : August 1, 2023
  • Accepted : February 16, 2024
  • Published : July 1, 2024

Kang Da-Jung 1 Lee Hye-Min 2 An Kay-Hyeok 3 Kim Byung-Joo 4

1전주대학교 재료응용연구소
2한국탄소산업진흥원 융합연구단
3전주대학교
4전주대학교 첨단소재화학공학과

Accredited

ABSTRACT

In this study, polyimide (PI)-based activated carbon fibers (ACFs) were prepared for application as electrode materials in electric double-layer capacitors by varying the steam activation time for the PI fiber prepared under identical cross-linking conditions. The surface morphology and microcrystal structural characteristics of the prepared PI-ACFs were observed by field-emission scanning electron microscopy and X-ray diffractometry, respectively. The textural properties (specific surface area, pore volume, and pore size distribution) of the ACFs were calculated using the Brunauer–Emmett–Teller, Barrett–Joyner–Halenda, and non-local density functional theory equations based on N2/77 K adsorption isotherm curve measurements. From the results, the specific surface area and total pore volume of PI-ACFs were determined to be 760–1550 m2/g and 0.36–1.03 cm3/g, respectively. It was confirmed that the specific surface area and total pore volume tended to continuously increase with the activation time. As for the electrochemical properties of PI-ACFs, the specific capacitance increased from 9.96 to 78.64 F/g owing to the developed specific surface area as the activation time increased.

Citation status

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This paper was written with support from the National Research Foundation of Korea.