Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Effect of pore structure on electrochemical performance of EDLC

EDLC의 전기화학적 성능에 대한 메조기공 구조의 효과

  • Lee, Myung-Suk (Department of Chemical Engineering, Research Institute of Industrial Sci. & Tech., Chungbuk National Univ.) ;
  • Shin, Yun-Sung (Department of Chemical Engineering, Research Institute of Industrial Sci. & Tech., Chungbuk National Univ.) ;
  • Lee, Jong-Dae (Department of Chemical Engineering, Research Institute of Industrial Sci. & Tech., Chungbuk National Univ.)
  • 이명숙 (충북대학교 화학공학과, 충북대학교 산업과학기술연구소) ;
  • 신윤성 (충북대학교 화학공학과, 충북대학교 산업과학기술연구소) ;
  • 이종대 (충북대학교 화학공학과, 충북대학교 산업과학기술연구소)
  • Received : 2010.06.29
  • Accepted : 2010.09.10
  • Published : 2010.09.30
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Abstract

The electrochemical properties of electric double layer capacitor(EDLC) was studied by controlling pore size distribution and specific surface area of the activated carbon fiber(ACF). The mesoporous ACF, which was prepared by the iron exchange method, showed the tendency of increasing average pore size and decreasing total surface area. The mesoporous ACF (surface area = 2225 $m^2$/g, pore size=1.93 nm) showed increased mesopore(pore size=1~3nm) volume from 0.055 cc/g to 0.408 cc/g compared to its raw ACF. The charging capacity of the EDLC which uses the prepared mesoporous ACF also increased from 0.39 F/$cm^2$ to 0.55 F/$cm^2$. From these results, it can be known that the electrochemical properties of EDLC are mainly dependent on the specific surface area, but above the surface area 2200 $m^2$/g, it is the mesopore volume that affects the performance of the capacitor considerably. Because the increased mesopore volume results in a decreased ion mobility resistance, the charge capacitance is enhanced.

Keywords

References

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