研究生: |
蒙娜麗莎 MONA-LISA HASAN |
---|---|
論文名稱: |
The Different Routes Of Synthesizing of PtCo/C Electrocatalysts for Oxygen Reduction Reaction The Different Routes Of Synthesizing of PtCo/C Electrocatalysts for Oxygen Reduction Reaction |
指導教授: |
黃炳照
Bing-Joe Hwang |
口試委員: |
周澤川
Tse-Chuan Chou 江志強 Jyh-Chiang Jiang 杜景順 Jing-Shan Do |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 英文 |
論文頁數: | 132 |
中文關鍵詞: | 陰極觸媒 、微波 |
外文關鍵詞: | X-ray Absorption Spectroscopy, DMFCs, microwave, cathode electrocatalyst, colloid method, urea method |
相關次數: | 點閱:191 下載:0 |
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ABSTRACT
One of the major goals of this research was to investigate relationship between the catalyst structure and the electrochemical activity of the bimetallic electrocatalyst prepared in different protocol. The carbon-supported Pt-Co is one of electrocatalyst for oxygen reduction reaction which has the enchancement than platinum. The XAS technique had been used for investigating the structure aspects which extracted from EXAFS data. The electrochemical measurement had been employed for investigating oxygen reduction reaction (ORR) by thin film on rotating disk electrode (RDE).
Microwave synthesis method was applied to prepare PtCo/C oxygen reduction electrocatalysts. The microwave irradiation combine with the modified-Watanabe method and the urea method were used for preparation of PtCo/C electrocatalysts. The different preparation yield different electrocatalyst of structure aspect and electrochemical properties. The modified-Watanabe has developed in our group but some of midification has been done for obtaining different structure. The urea method combine with microwave irradiation has been introduced as new approach for preparing PtCo/C electrocatalysts. Hydrolysis of urea at 90 oC was used to achieve the homogeneous production of hydroxyl ions to increase the pH from acidic to around neutral at this temperature, a pH of around 6. But by using microwave irradiation, the final pH value attained at pH 8. After preparation, the heat treatment was applied for as-synthesized at 300 oC and 400 oC in 10% H2 atmosphere.
The synthesized PtCo/C were characterized by various techniques for investigating its structure. XRD and TEM data showed that the as-synthesized catalyst have average particles size about 2 - 3 nm for the samples synthesized by the Watanabe method and 8 - 11 nm for the samples synthesized by the urea method after heat treatment at 400 oC. The cyclic voltammogram measurement in 0.5 M H2SO4 have been performed on all the prepared as well as commercial Pt/C-Etek and PtCo/C-Etek. The linear scan voltammogram have also been performed for investigating ORR in 0.5 M H2SO4 after purging O2 for 30 minutes. The activities of some of the as-synthesized are nearly similar and some are slightly higher when compared to commercially available Pt/C-Etek and PtCo/C-Etek. Expecially the samples had prepared by modified-Watanabe microwave method offer good performance than any other samples
XAS analysis on all the prepared and commercial samples has shown that the the catalyst contains Pt rich in its core and Co rich in the shell of bimetallic catalyst. And some of the catalyst has reversed structure where Co rich in core and Pt rich in shell.
Keywords: Cathode electrocatalysts, Microwave, DMFCs, Urea method, Colloid method, X-ray absorption spectroscopy, Oxygen reduction reaction
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