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URN etd-0914107-163700 Statistics This thesis had been viewed 4052 times. Download 2625 times. Author Chi-ming Huang Author's Email Address No Public. Department Materials Engineering Year 2006 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 228 Title Preparation of Vulcan XC-72 or MWCNT supported Pt and PtRu catalysts via methanol reduction method Keyword MWCNT DMFC methanol reduction method catalyst catalyst methanol reduction method DMFC MWCNT Abstract Vulcan XC-72 and MWCNT were treated with nitric acid with/without intermittent ultrasonic vibration, and the effects were revealed with FTIR. It was found that acid washing in company with intermittent ultrasonic vibration can enhance the formation of oxy-functional groups. Vulcan XC-72 or MWCNTs supported Pt and PtRu catalysts were prepared by methanol reduction method. ICP-OES was used to analyze the metal residual in the filtrate to determine the amount of metal deposition. It was found that the higher oxy-functional group in the carbon support is used the more active sites for metal deposition can be provided, and thus the higher rate of metal deposition can be obtained. From the results of XRD and SEM, well dispersed metal particles with low crystallinity, low degree of alloying, and particle size ranging between 1 and 2 nm can be found on the surface of the carbon supports. The synthesized Pt/Vulcan XC-72 shows higher catalysis for methanol electro-oxidation than commercialized 20wt%-Pt/C (E-TEK). However, the prepared PtRu/C catalysts manifest poor catalytic activity of methanol electro-oxidation due to its small particle size and low degree of alloying that induce strong adsorption of CO. Advisor Committee She-huang Wu - advisor
Hong-ming Lin - co-chair
Ru-shi Liu - co-chair
Wen-chang Chen - co-chair
Files Date of Defense 2007-07-14 Date of Submission 2007-09-17