Electro-oxidation of methanol and ethylene glycol on platinum in alkaline solution: Poisoning effects and product analysis |
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| Authors: | Koji Matsuoka Takeshi Abe Zempachi Ogumi |
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| Affiliation: | a Department of Energy & Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
b Faculty of Science & Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan |
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| Abstract: | The electrochemical oxidation of ethylene glycol on platinum was investigated and compared with that of methanol in alkaline solution by using various electrochemical and analytical measurements. Ethylene glycol showed much less significant electrode poisoning than methanol at low potential (400 mV). This phenomenon was clarified by analyzing the products of ethylene glycol oxidation. In ethylene glycol oxidation, partial oxidation to glycolate was much faster than complete oxidation to CO2. In addition, there were two paths for ethylene glycol oxidation: poisoning and non-poisoning paths. The poisoning path led to the production of C1 compounds and the non-poisoning path gave oxalate. The non-poisoning path prevented the formation of poisonous species on platinum. |
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| Keywords: | Fuel cell Electro-oxidation Methanol Ethylene glycol Poisoning Alkaline solution Reaction mechanism Product analysis |
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