Gas Diffusion Electrode With Large Amounts of Gas Diffusion Channel Using Hydrophobic Carbon Fiber: For Oxygen Reduction Reaction at Gas/Liquid Interfaces
| Autor: | Toshiyuki Iwasaki, Shohei Tada, Pantira Privatananupunt, Ryuji Kikuchi |
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| Rok vydání: | 2017 |
| Předmět: |
Gas diffusion electrode
Renewable Energy Sustainability and the Environment Mechanical Engineering Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Thermal conduction 01 natural sciences Oxygen 0104 chemical sciences Electronic Optical and Magnetic Materials Dielectric spectroscopy chemistry Mechanics of Materials Electrode Gaseous diffusion 0210 nano-technology Porosity |
| Zdroj: | Journal of Electrochemical Energy Conversion and Storage. 14 |
| ISSN: | 2381-6910 2381-6872 |
| DOI: | 10.1115/1.4036507 |
| Popis: | For a gas diffusion cathode for oxygen reduction reaction (ORR) in aqueous alkaline electrolyte, it is important to create networks for O2 gas diffusion, electronic conduction, and liquid-phase OH− transport in the cathode at once. In this study, we succeeded to fabricate a promising cathode using hydrophobic vapor grown carbon fibers (VGCF-Xs), instead of hydrophobic carbon blacks (CBs), as additives to its active layer (AL). Mercury porosimetry, as well as electrochemical impedance spectroscopy, showed that porosity of the cathode gradually increased with increasing the amount of the carbon fibers. In other words, addition of larger amount of the carbon fibers creates better O2 gas diffusion channels. Also, the activation polarization resistance for the ORR increased as the carbon fibers' amount from 0 to 0.03–0.04 g and then dropped. In consequence, the cathode with 0.03 g of the carbon fibers exhibited the highest ORR performance among the prepared cathodes. |
| Databáze: | OpenAIRE |
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