Anodic Nano-catalysts of Pt-Sn Nanoparticles by Microwave Irradiation for Alcohol Fuel Cells

• Main Authors: Yi-Hsiang Li, 李裕翔
• Other Authors: Jenshi B. Wang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/71154200615332576131

碩士 === 義守大學 === 生物技術與化學工程研究所碩士班 === 96 === This research aims to study preparation of novel anodic nano-catalysts by microwave irradiation for alcohol fuel cells , utilizing ethylene glycol(EG) as both reducing agent and solvent. Different atomic compositions of Pt-Sn nanoparticles were employed for the fabrication of bi-metallic nano-catalysts with carbon black as supports to explore effects on methanol and ethanol electro-oxidation, and CO-tolerance. Electrochemical investigations involving cyclic voltammetry, chronoamperometry, chronopotentiometry as well as hydrogen electroadsorption were undertaken to study the resulting Pt-Sn/C catalysts to be appropriate for alcohol fuel cell anodes. It has been found that the catalysts of the composition of Pt1Sn2 exhibit the best methanol and ethanol electro-oxidative behaviors. Besides, CO tolerance of the catalysts also enhances with increasing Sn content of the electrode, Pt1Sn2 being the best also. The microwave irradiated samples exhibited better anodic properties in terms of methanol and ethanol electro-oxidation, because of shorted crystal nucleation, than those heated in conventional oven. Studies of XRD and TEM as well as hydrogen electroadsorption showed that Pt1Sn2/C exhibited the smallest crystallite size and highest electro-chemically active Pt surface area, respectively, thus verifying its methanol and ethanol electro-oxidative performances.