| Summary: | 碩士 === 義守大學 === 生物技術與化學工程研究所碩士班 === 95 === This research is aimed at studies to prepare novel anodic nano-catalysts by reverse microemulsion for direct methanol fuel cells, utilizing the system of AOT/isooctane as surfactant and hydrazine as reducing agent. Different atomic compositions of Pt-Ru nanoparticles were employed for the fabrication of bi-metallic nano-catalysts with carbon black and multi-walled carbon nanotubes as supports to explore effects on methanol electro-oxidation and CO tolerance. Electrochemical investigations involving cyclic voltammetry, chronoamperometry and hydrogen electroadsorption were undertaken to study the resulting Pt-Ru/C and Pt-Ru/MWCNT catalysts to be appropriate for DMFC anodes. It has been found that the catalysts of the composition of Pt75-Ru25 exhibit the best methanol electro-oxidative behaviors. However, CO tolerance of the catalysts studied enhances with increasing Ru content of the electrode, with Ru100 being the best. Experimental results reveal that catalysts fabricated by multi-walled carbon nanotubes as supports exhibit superior behaviors in terms of methanol electro-oxidation and CO tolerance to those prepared by carbon black. XRD and TEM as well as hydrogen electroadsorption show that Pt75-Ru25/MWCNT exhibits the smallest crystallite size and highest electro-chemically active Pt surface area, respectively, thus verifying its methanol electro-oxidation performances.
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