전기화학중합시 산농도가 Ta/Ppy 캐패시터의 특성에 미치는 영향

신미선; 김재근; 여태환; Miseon Shin; Jaekun Kim; Taewhan Yeu

Journal of the Korean Industrial and Engineering Chemistry, Vol.15, No.7, 743-748, November, 2004

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전기화학중합시 산농도가 Ta/Ppy 캐패시터의 특성에 미치는 영향

Effects of the Acid Concentration for Electrochemical Polymerization on the Characteristics of Ta/Ppy Capacitor

신미선, 김재근, 여태환 ^†

중앙대학교 화학공학과, 서울 156-756

Miseon Shin, Jaekun Kim, and Taewhan Yeu^†

Department of Chemical Engineering, Chung-Ang University, Seoul 156-756, Korea

E-mail:

초록

기존의 Ta/MmO₂ 대신 새로운 Ta/Ppy 시스템에 있어서 전기화학중합용 지지전해액의 pH가 폴리피롤 및 캐패시터 특성에 미치는 영향을 연구하였다. 지지전해액의 pH는 oxalic acid의 농도로 조절하였다. 유기용제인 아세토니트릴을 지지전해액의 용매로 사용한 경우 지지전해액의 이온전도도는 도판트로 사용한 tetraethylammonium-p-toluenesulfonate에 좌우되었으며 첨가된 oxalic acid는 별다른 영향을 미치지 않았다. 그러나 전기화학중합된 폴리피롤의 전기전도도 및 콘덴서 특성은 oxalic acid 농도에 크게 좌우되었으며, acid 농도 0.2 몰 이상(pH 1.0 이하)의 상태에서 MnO₂ 대비 1/3 수준의 낮은 등가직렬저항 특성이 구현되었다.

A study on the effects of the acid concentration of supporting electrolyte for electrochemical polymerization on the characteristics of a new Ta/Ppy system instead of Ta/MnO₂ capacitor was carried out. The pH of supporting electrolyte was controlled by the change of oxalic acid concentration. Ionic conductivity of the supporting electrolyte did not depend on concentration of oxalic acid but tetraethylammonium-p-toluenesulfonate used as a dopant. But the electronic conductivity of polypyrrole film polymerized electrochemically and the characteristics of capacitor did depend on the concentration of oxalic acid considerably. In the case of using the concentration over 0.2 mol/L acid (below pH 1.0), low ESR level, about a third of the conventional MnO₂ type was obtained.

Keywords:polypyrrole;tantalum capacitor;ESR;electrochemical polymerization;conducting polymer

[References]

Nishino A, J. Electrochem. Soc., 69, 397 (2001)
Nishino A, in M. Z. A. Munshi (Ed.), Handbook of Solid State Batteries & Capacitors, World Scientific, Singapore, 627 (1995)
Nishino A, J. Power Sources, 60, 137 (1996)
Kim J, Cho S, Min H, Choi J, Hwang K, J. Korean Ind. Eng. Chem., 11(5), 535 (2000)
Larmat F, Reynolds JR, Qiu YJ, Synth. Met., 79, 229 (1996)
Kim J, Min H, Yu H, Kang K, J. Korean Ind. Eng. Chem., 12(6), 671 (2001)
Naoi K, Shimada A, Suematsu S, Machida K, J. Electrochem. Soc., 69, 447 (2001)
Yamamoto H, Kanemoto K, Oshima M, Isa I, J. Electrochem. Soc., 67, 855 (1999)
Kudoh Y, Akami K, Matsuya Y, Synth. Met., 102, 973 (1999)
Goudswaard B, Electrochemical Technology, 6, 178 (1968)
Cvetko BF, Brungs MP, Burford RP, Skyllaskazacos M, J. Mater. Sci., 23, 2102 (1988)

[Referenced By]

[Related Articles]

[1] Nishino A, J. Electrochem. Soc., 69, 397 (2001)

[2] Nishino A, in M. Z. A. Munshi (Ed.), Handbook of Solid State Batteries & Capacitors, World Scientific, Singapore, 627 (1995)

[3] Nishino A, J. Power Sources, 60, 137 (1996)

[4] Kim J, Cho S, Min H, Choi J, Hwang K, J. Korean Ind. Eng. Chem., 11(5), 535 (2000)

[5] Larmat F, Reynolds JR, Qiu YJ, Synth. Met., 79, 229 (1996)

[6] Kim J, Min H, Yu H, Kang K, J. Korean Ind. Eng. Chem., 12(6), 671 (2001)

[7] Naoi K, Shimada A, Suematsu S, Machida K, J. Electrochem. Soc., 69, 447 (2001)

[8] Yamamoto H, Kanemoto K, Oshima M, Isa I, J. Electrochem. Soc., 67, 855 (1999)

[9] Kudoh Y, Akami K, Matsuya Y, Synth. Met., 102, 973 (1999)

[10] Goudswaard B, Electrochemical Technology, 6, 178 (1968)

[11] Cvetko BF, Brungs MP, Burford RP, Skyllaskazacos M, J. Mater. Sci., 23, 2102 (1988)