The Study on Electrocatalytic behavior of Fuel Cell on a Poly(Ni(Ⅱ)-tetramethyldibenzotetraazo[14] annulene) Modified Electrode

• Main Authors: Wan-Ting Tseng, 曾琬婷
• Other Authors: 張家欽 - 委員
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/77365556210588744128

碩士 === 國立臺南大學 === 自然科學教育學系碩士班 === 91 === In this paper, a series of survey on electrocatalytic behaviors of fuel cell are done at Ni(tmdbta)n modified electrodes which are electropolymerization of macrocyclic nickel complex, Ni(tmdbta), on glassy carbon working electrode by cyclic voltammetry. The cyclic voltammetry of Ni(tmdbta)n modified electrode shows good stability in alkaline buffer solution of pH=10~13 for 150 scans. The electochemical properties of Ni(tmdbta)n modified electrode are studied by different voltage scanning range. The electrochemical behaviors of Ni(tmdbta)n modified electrode are very stable and exhibits good electrochemical stability in alkaline buffer solutions. Then, by utilizing Ni(tmdbta)n modified electrode in catalysis, the research was designed to study oxygen reduction and catalyze methanol oxidation for fuel cell. This experiments show that Ni(tmdbta)n modified electrode inhibit oxygen reduction, but result in catalyze methanol oxidation. Therefore, the direction of the research turns to 「oxidation」 of methanol. Using one kind of simple (such as methanol)and benzyl alcohol which is having benzene ring individually in the reaction, we change the concentration of organic and sodium hydroxide and temperature alternatively. By kinetic parameter, the reaction order of alcohols and sodium hydroxide are first and second. This further indicates the possible reaction mechanism of Ni(tmdbta)n modified electrode. By the data of methanol oxidation with Ni(tmdbta)n glassy carbon modified electrode, the modified film is likely to prevent the phenomenon of poisoning. For the reason, we try to modify Ni(tmdbta)n modified film on platinum electrode. Besides, understanding which role Ni(tmdbta)n platinum modified electrode plays in methanol oxidation, we can know the influencing ability of substrare in this reaction. By analyzing gained data, the levels of reaction that alcohol and sodium hydroxide involved are still first and second order, which show no difference in Ni(tmdbta)n glassy carbon modified electrode. Therefore, the effect of substrate can be neglected. Besides, we compare Ni(tmdbta)n platinum modified electrode with platinum electrode by potentiostatic electrolysis, and find that Ni(tmdbta)n platinum modified electrode is indeed able to inhibit electrode poisoning.