Correlation between the pore and solvated ion size on capacitance uptake of PVDC-based carbons

• Published in: Carbon (New York) Vol. 42; no. 8; pp. 1491 - 1500
• Main Authors: Kim, Y.J, Horie, Y, Ozaki, S, Matsuzawa, Y, Suezaki, H, Kim, C, Miyashita, N, Endo, M
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 2004; Elsevier Science
• Subjects: A. Activated carbon; B. Activation; C. Adsorption; Chemistry; Colloidal state and disperse state; Cross-disciplinary physics: materials science; rheology; D. Electrochemical properties; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; General and physical chemistry; Materials science; Physics; Porous materials; Specific materials; A. Activated carbon; D. Electrochemical properties; B. Activation; C. Adsorption; Capacitance; Ions; Pore; Carbon; Correlations; Porous materials
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2004.01.049

A nonaqueous electrolyte solution is employed to form double layers on a poly(vinylidene chloride) (PVDC)-based carbon material, thereby extending the application of PVDC-based carbon to nonaqueous systems. Thermal behavior of the Npv-series, which was obtained by simple heat treatment under an inert atmosphere, and the Apv-series, which is obtained by potassium hydroxide (KOH) addition, is confirmed by thermal gravimetric analysis (TGA). The KOH activation affect on the structure of PVDC-based carbon is shown and demonstrates a high capacitance in nonaqueous electrolyte systems. Variation of the pore size distribution on the double layer capacitance is explained on the basis of computer simulation. Carbons with different porous structures are prepared by KOH impregnation as a function of heat-treatment temperature (HTT). The effects of the porous structure on the electrochemical behavior and the capacitance of the resulting electric double layer capacitors (EDLCs) are investigated.