Properties of Gas Adsorption and Electrocatalysis on Carbon-Supported Ruthenium and Platinum Catalysts

• Main Authors: Kuo-Chuan Chen, 陳國泉
• Other Authors: Sui-Wen Ho
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/31017291144603680255

碩士 === 國立成功大學 === 化學系碩博士班 === 96 === This thesis is composed of two parts. Part one contains the study of gas adsorption on carbon-supported Ru catalysts. It is found that CO chemisorption and XRD agree with each other in charactering Ru catalysts. However, H2 chemisorption on Ru catalysts was affected by a number of factors such as Ru precursor (RuCl3 or Ru(acac)3), Ru loading, support (carbon black or carbon nanotube) and pretreatments (oxidation and reduction temperature), and can be either suppressed or enhanced. This implies that the catalytic behaviour of Ru may be tailored. Part two contains the investigation of the electro-catalytic behaviours of carbon-supported Ru and Pt catalysts. It is found that only part of Ru surface is electro-active for highly-dispersed Ru catalyst, and carbon-supported Ru is not active for the electro-oxidation of methanol at room temperature. For Pt and PtRu catalysts (E-TEK), the electro-active surface area is found to decrease gradually as the number of cyclic scan increases. For Pt catalysts, when potential range is increased from 0.6V~-0.2V to 1.1V~-0.2V, the electro-active surface area of Pt decreases to a much lower extent. This implies the loss of electro-active Pt surface at high oxidation potential.