Characterization of Fuel Cell Catalysts by Cyclic Voltammetry and Rotated Disk Voltammetry

以循環伏安法和旋轉盤伏安法特性分析燃料電池用電極觸媒

林仁斌(R. B. Lin) ； 范姜維亮(W. L. Fanjiang) ； 李鴻達(H. T. Li)

《華岡工程學報》 25期 (2010/01) Pp. 107-116

https://doi.org/10.29987/CCUHKJE.201001.0015

摘要

本研究以循環伏安法及旋轉盤伏安法特性分析Pt/C觸媒之電化學特性及其對氫氣氣化的催化活性。應用修正的Koutecky-Levich方程式，可求出反應動力學參數。氫氣氣化電流因Nafion膜的存在而減少。當觸媒層厚度小於10μg Pt cm^(-2)及Nafion膜厚度小於0.2μm時，氫氣的質傳阻力可以忽略。根據Pt/C觸媒的真實面積(110平方公尺g^(-1)Pt)，所求得Pt/C觸媒的交換電流密度為0.75mAcm^(-2)。本研究之結果有助於使用Pt/C觸媒的燃料電池的電極之設計。

關鍵字

電觸媒 ； 旋轉電極 ； 氫氣氧化反應 ； Nafion ； 燃料電池

並列摘要

The electrochemical behavior of the Pt/C catalyst and its electrocatalytic activity toward hydrogen oxidation was characterized by cyclic voltammetry and rotated disk voltammetry. The modified Koutecky-Levich equation was used to determine the kinetic parameters. The current density was reduced by the presence of Nafion coating. By reducing the thickness of both the catalyst layer (≦10 μg Pt cm^(-2)) and the Nafion film (≦0.2 μm), the H2 mass-transport resistances can be neglected. The exchange current density based on the real electroactive surface area (110 m^2g^(-1) Pt) of the Pt/C catalyst was determined to be about 0.75 mA cm^(-2). The results of this study are useful for designing the electrodes for fuel cells using Pt/C catalyst.

並列關鍵字

electrocatalyst ； rotating disk electrode ； hydrogen oxidation ； Nafion ； fuel cells