Galvanostatic Pulse Plating of PtRu Nanoparticles for Direct Methanol Fuel Cells

摘要

A galvanostatic pulse electrodeposition technique of preparing nanoparticulate PtRu electrocatalyst for direct methanol fuel cells has been demonstrated. After extensive cyclic voltammetric analysis, we determined the optimized parameters for the methanol oxidation to be current on-time on 50 ms, current off-time of 400 ms, current density of 50 mA/cm~2, and total charge of 8.0 C/cm~2. In addition, the catalyst loading was measured at 68 μg/cm~2,rnresulting in a mass activity of 213 mA/Pt. mg. The composition forrnthe nanoparticles was confirmed as Pt_(65)Ru_(35). High-magnification images on the specimen indicated fine particles in 4-20 nm with uniform distributions.