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임피던스 복소캐패시턴스 분석법의 이론 및 응용

Complex Capacitance Analysis of Impedance Data and its Applications

오승모|장종현
한국전기화학회 (The Korean Electrochemical Society)|2010.11|전기화학회지 (Journal of the Korean Electrochemical Society)|제13권 제4호|pp. 223-234

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참고문헌

키워드

Polymer electrolyte membrane fuel cell (PEMFC)Porous electrodeElectrochemical impedance spectroscopy (EIS)Complex capacitance analysisElectric double-layer capacitor (EDLC)
주제분류화학

초록

본 총설에서는 캐패시터적인 특성을 가지는 다공성 전극의 전기화학특성 분석에 활용되는 임피던스의 복소캐패시턴스 분석법(complex capacitance analysis)의 이론 및 응용에 대해 정리하였다. 이론적으로 캐패시터적인 특성을 갖는 전기화학시스템에 대해 캐패시턴스허수부 도시를 활용하면효과적인 해석이 가능함이 제시되었다. 또한, 복소캐패시턴스 분석법은 다공성 탄소 재료/전극의EDLC 특성, 미세기공 내부의 이온전도 특성, 고분자전해질연료전지의 촉매층 이온저항 등의 분석에 효과적으로 적용될 수 있음이 검증되었다.

Abstract

In this review, the theory and applications of the complex capacitance analysis,which can be utilized in analyzing capacitor-like electrochemical systems, were summarized. Theoretically, it was suggested that the imaginary capacitance plots (Cim vs. log f) can provide a simple way to analyze electrochemical characteristics of capacitive systems, without complicated mathematical calculations. The usefulness of the complex capacitance analysis has been demonstrated by applying it to analyze EDLC characteristics of practical porous carbon electrodes,ionic conductivities inside small pores, and ionic resistances in the catalyst layers of polymer electrolyte membrane fuel cells.

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