| Issue |
Korean Chemical Engineering Research,
Vol.43, No.1, 118-124, 2005
Vol.43, No.1, 118-124, 2005
폴리피롤로 개설된 SPE 전극촉매의 제조 및 PEMFC로의 응용
Preparations of SPE Electrocatalysts Modified with Polypyrrole and Its Application for PEMFC
본 연구에서는 폴리피롤로 개질된 Nafion 막에 직접적으로 백금촉매를 담지하는 방법을 제시하고 PEMFC로의 응용을 검토하였다. 개시제로 FeCl3 및 Na2S2O8을 사용하여 피롤을 Nafion 막에 중합하였다. 제조된 PPy/Nafion 복합체막의 양이온 전도도와 함수율을 측정한 결과, Na2S2O8을 사용하여 제조된 복합체 막은 피롤 중합시간이 증가할수록 양이온 전도도와 함수율은 감소하였고, FeCl3의 경우 함수율은 감소하지만 양이온 전도도는 유지되었다. 폴리피롤로 개질된 Nafion 막에 백금 촉매를 화학적 환원법에 의해 함침한 결과, 폴리피롤의 전자 전도성 특성에 의해 백금 담지가 향상됨을 알 수 있었다. 또한, Pt/PPy/Nafion 전극촉매와 확산 전극으로 구성된 MEA를 단위 연료전지 성능평가를 행한 결과, 0.3 V의 전위에서 569 mA/cm2의 전류밀도 값을 갖는 연료전지 성능을 얻을 수 있었다.
In this study, a novel deposition method of Pt catalysts onto Nafion membranes modified with polypyrrole (PPy) has been proposed for PEMFC application. The PPy/Nafion composite membranes were fabricated by chemical polymerization of pyrrole using FeCl3 and Na2S2O8 as initiator. The proton conductivity and water uptake of the chemically prepared PPy/Nafion composites were investigated. The ionic conductivity and water uptake of PPy/Nafion composite membrane prepared with Na2S2O8 were decreased with polymerization time of pyrrole. In the case of FeCl3, the ionic conductivity was almost retained and the water uptake was decreased with polymerization time of pyrrole. When the Pt particle was deposited on PPy/Nafion composites membrane by chemical reduction of H2PtCl6, the Pt loading on Nafion membrane was enhanced by polypyrrole due to electronic conduction property. The performance evaluation with membrane electrode assembly composed of Pt/PPy/Nafion composite and diffusion electrode was carried out using a single cell. As a result of fuel cell test, current density of 569 mA/cm2 at 0.3 V has been obtained for MEA contained with Pt/PPy/Nafion composite. This study shows that direct deposition of Pt catalysts on Nafion impregnated polypyrrole is a promising method to prepare thin catalyst layer for the PEMFC.
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