Dissertation > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Electrochemical,electrolytic,magnetic,chemical > Electrolysis and Electrode role > Electrode process

The Electro-Oxidation Behavior of Ethylene Glycol on Platinum and Platinum Based Electrodes

Author WangGuoFu
Tutor ZhongQiLing
School Jiangxi Normal University
Course Organic Chemistry
Keywords Glycol The electrodes of the Pt-Ru Pt - Sn electrodes Cyclic voltammetry
CLC O646.54
Type Master's thesis
Year 2008
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Due to the many advantages of the fuel cell, is being more and more attention of the people. The direct methanol fuel cell due to the use of liquid alcohols with safe, easy storage and transportation, low fuel prices, eliminating the need for a hydrogen reformer trouble locking, with very attractive prospects for development. Commonly used in the fuel cell is expensive noble metal platinum catalyst, and platinum, there is a resulting weakness, i.e. susceptible caused by the adsorption of CO poisoning of the catalyst Therefore, how to improve the utilization of platinum, reducing the use amount of platinum , reduce costs, improve anti-toxic properties of the platinum catalyst is still a challenging task. The current research in this area and have made very big progress. People to develop a variety of methods to reach this point, such as adding a second metal (Ru, Sn, Mo, etc.) can significantly improve the catalytic activity of platinum-toxic and anti-CO; development of a new method for preparing improve platinum dispersibility, stability and control the particle size of the platinum nanometers, the polymorph to provide it with the best catalytic performance; development of non-platinum catalyst. TWO metal catalyst, Pt-Ru is considered to be the best catalyst of small molecular alcohols. Currently, its catalytic mechanism, the prevailing view was that the bi-functional mechanism and electronic effects. However, due to the bimetallic catalyst in the element ratio, polymorph, element distribution, particle size, and other aspects of the complex, therefore, to be comprehensive in-depth understanding of the bimetallic catalyst of the catalytic mechanism must be designed, controlled structure nanoparticles studied the relationship between the catalyst structure, performance, activity, an in-depth understanding of the catalytic mechanism, provide theoretical guidance for the design of the actual catalyst. Ethylene glycol (EG) as a small molecule alcohols, is ideal for direct methanol fuel cell fuel, current research focuses on methanol, ethanol, glycol is still quite limited, therefore, to carry out its platinum based catalyst on the electro-oxidation reaction becomes necessary. Therefore, the above problems, the paper carried out following areas: (1) by electrodeposition or rough preparation of different roughness, different particle size of Pt nanoparticles modified Pt (Pt / Pt) electrode using conventional electrochemical (cyclic voltammetry) research to understand the particle size, surface roughness on the Catalytic Performance (2) prepared by electrodeposition method glycol electrocatalytic behavior of platinum, ruthenium, platinum, tin ratio Pt-Ru/Pt, Pt-Sn/Pt electrode to study the catalytic activity of CO and EG. By in situ surface-enhanced Raman spectroscopy (the in-situSERS) study the the electrocatalytic oxidation behavior of the electrode EG. Through the above study, preliminary draw the relationship between the structure, performance, activity. In addition, try to prepare nanoparticles by chemical reduction method modified electrode and to study the electro-oxidation of EG and SERS behavior. The above studies have shown that EG, Pt-Ru/Pt, and Pt-Sn/Pt electrode has good electrocatalytic activity, the activity level of and Pt-Ru/Pt, composition of the Pt-Sn/Pt electrode closely related.

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