Direct Electro‐oxidation of Dimethoxymethane, Trimethoxymethane, and Trioxane and Their Application in Fuel Cells
| Autor: | S. Surampudi, E. Vamos, H. Frank, C. Cropley, M. C. Smart, Sekharipuram R. Narayanan, G. Halpert, R. Knieler, G. K. Surya Prakash, J. Kosek, G. A. Olah |
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| Rok vydání: | 1997 |
| Předmět: |
Trimethyl orthoformate
Trioxane Renewable Energy Sustainability and the Environment Inorganic chemistry Condensed Matter Physics Electrochemistry 1 3 5-Trioxane Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis chemistry.chemical_compound chemistry Nafion Materials Chemistry Methanol Dimethoxymethane |
| Zdroj: | Journal of The Electrochemical Society. 144:4195-4201 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.1838165 |
| Popis: | Significant advantages in weight, volume, and overall system performance of fuel cells would result if high-energy organic substances such as methane and its derivatives can be made to undergo direct electro-oxidation at the electrodes of the fuel cell without having to be converted by some catalytic process to hydrogen. This study demonstrates three novel fuels for direct-oxidation-type fuel cells. These new fuels are dimethoxymethane (DMM, dimethyl orthoformate), trimethoxymethane (TMM, trimethyl orthoformate), and trioxane (1,3,5-trioxane). The electro-oxidation and electrosorption characteristics of these new fuels at Pt, Pt-Sn, and Pt-Ru electrodes and the performance of these fuels in direct-oxidation fuel cells is described. Sustained direct electrochemical oxidation of aqueous solutions of DMM, TMM, and trioxane at high current densities has been demonstrated for the first time in half-cells and liquid-feed polymer electrolyte fuel cells. The oxidation of these fuels leads to the formation of methanol and ultimately carbon dioxide. Cyclic voltammetry and steady-state studies suggest that the electro-oxidation processes occur by chemisorption steps followed by surface reactions of adsorbed intermediates. The electro-oxidation of trioxane is preceded by an acid-catalyzed hydrolysis step on Nafion and in sulfuric acid solutions. These new fuels are best used without further processing in direct liquid-feed polymer electrolytemore » fuel cells.« less |
| Databáze: | OpenAIRE |
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