S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Electric double-layer capacitor performance of a new mesoporous carbon
- Yoon, Songhun; Lee, Jinwoo; Hyeon, Taeghwan; Oh, Seung M.
- Issue Date
- Electrochemical Society
- Journal of the Electrochemical Society, Vol.147 No.7, pp.2507-2512
- A new mesoporous carbon (NMC) was prepared, and its performance in an electric double-layer capacitor (EDLC) was compared to that of a conventional carbon (a molecular-sieving carbon, MSC25). The effect of pore size and pore connection pattern on EDLC performance was demonstrated. To prepare NMC, phenol resin was synthesized inside the pores of an inorganic template, Mobile Composite Material 48 (MCM48), and the resulting resin-template composite was carbonized at 700 degrees C under Ar atmosphere. A coke-like carbonaceous material was obtained after removing the inorganic template by HF treatment. The surface area of NMC was 1257 m(2) g(-1) which is smaller than that of MSC25 (1970 m(2) g(-1)). NMC had three-dimensionally interconnected mesopores (2.3 nm average diam), but randomly connected cage-like micropores (<2.0 nm) were dominant in MSC25. The difference in the pore size and pore connection pattern between the two carbons gave rise to a remarkable difference in their EDLC performances. NMC exhibited a smaller specific capacitance (about 120 F g(-1)) than MSC25 as a result of its smaller surface area, but it showed a higher critical scan rate than the MSC25 electrode due to a smaller resistance-capacitance (RC) time constant. The specific charging capacity of the NMC electrode was about 20 mAh g(-1) and was largely invariant vs. the charge-discharge rate. This was contrasted by MSC25 which showed a steadily decreasing capacity with an increase in rate. As a result, the NMC electrode outperformed the MSC25 based on rate capability. The smaller RC time constant and better rate capability of the NMC electrode apparently arises from the lower electrolyte resistance in pores, which in turn stems from the faster ionic motion in larger pores. (C) 2000 The Electrochemical Society. S0013-4651(00)01-080-6. All rights reserved.
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- College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Chemical Convergence for Energy and Environment (에너지환경 화학융합기술전공)Journal Papers (저널논문_에너지환경 화학융합기술전공)