Preparation of Gas Diffusion Electrodes by Electrophoretic Deposition

Abstract

Gas diffusion electrodes were prepared by precipitates deposited from carbon-polytetrafluoroethylene dispersions using an electrophoretic deposition technique. The amount of the precipitate deposited on the oppositely charged electrode varied with the electrode substrate, suggesting that ions dissolved from the anode have the ability to coagulate particles. A cross-sectional analysis of the precipitate showed the profile of a functionally graded material. The ability of the gas diffusion electrode using Pt as a catalyst in alkaline solution to promote oxygen reduction and hydrogen oxidation was high. The fuel cell in which the gas diffusion electrodes were used generated 0.77 V at 0.3 A/cm2. © 2004 The Electrochemical Society. All rights reserved.