정전위 전해 중합법에 의한 폴리피롤 제조 및 전기화학적 특성
Preparation and Electrochemical Charateristics of Polypyrrole by Constant Potential Electroplymerization
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초록
본 연구에서는 정전위 전해중합법으로 음이온 크기가 다른 도펀트를 사용하여 폴리피롤 전극을 제조하였으며, CV 및 교류 임피던스법을 이용한 전기화학적 분석 및 형태학적 분석을 통해 제조된 폴리피롤 전극의 특성을 고찰하였다.제조된 전극을 전기화학적으로 분석한 결과 PPy/ClO4 전극은 음이온의 도핑탈도핑이, PPy/PVS 전극은 양이온의 탈도핑도핑이 일어나고 있음을 알았다. 합성 전위가 증가할수록 PPy/ClO4 전극과 PPy/PVS 전극 모두 전하전달저항은 감소하였고, 이중층 용량은 PPy/ClO4 전극이 PPy/PVS 보다 큼을 알 수 있었다. 합성 전위 변화에 따른 PPy/PVS 전극 표면의 변화는 상대적으로 PPy/ClO4 보다 작음을 알 수 있었다.
Abstract
In this study, the PPy/ClO4 and PPy/PVS composite electrodes were prepared at various polymerization potential by incorporating electrolyte anions of different anion size during conatant potential polymerization. The reulting polypyrrole surfaces were inspected by SEM, and their electrochemical properties were investigated with CV and ac impedance method. The results of electrochemical analysis were suggested that anion for PPy/ClO4 electrode and cation for PPy/PVS- electrode were transferred during redox reaction. As constant potential of polymerization was increased, the charge transfer resistance of PPy/ClO4 and PPy/PVS was decreased and the electric double layer capacitances of PPy/ClO4 was higher than that of PPy/PVS. The change of PPy/PVS surface was relatively smaller than that of PPy/ClO4 according to electropolymerization potential.
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