Method of measuring oxygen diffusivity in microporous media |
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| Authors: | Yoshio Utaka Yutaka Tasaki Shixue Wang Toru Ishiji Shoich Uchikoshi |
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| Affiliation: | 1. Division of Systems Research, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan;2. Fuel Cell Laboratory, Nissan Research Center, Nissan Motor Co. Ltd., 1 Natsushima-cho, Yokoshuka, Kanagawa 237-8523, Japan;3. Riken Keiki Co. Ltd., 2-7-6 Azusawa, Inabashi-ku, Tokyo 714-8744, Japan;1. State Key Laboratory of Engines, Tianjin University, 135 Yaguan Rd, Tianjin 300350, China;2. Renewable Energy Resources Laboratory (RERL), Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA 92697-3975, United States;1. Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran;2. Department of Mechanical & Aeronautical Engineering, University of Pretoria, Pretoria, South Africa;1. Mechatronic Systems Engineering, School of Engineering Science, Simon Fraser University, Surrey V3T 0A3, BC, Canada;2. Department of Mechanical Engineering and Institute for Integrated Energy Systems, University of Victoria, Victoria V8W 3P6, BC, Canada;1. Department of Chemical Engineering, Faculty of Engineering, Kyoto University, Kyoto-daigaku-katsura, Nishikyo-ku, Kyoto 615-8530, Japan;2. Fuel Cell Cutting-Edge Research Center Technology Research Association (FC-Cubic TRA), 2-3-26, Aomi, Kouto-ku, Tokyo 135-0064, Japan;1. Dept. de Ingeniería Térmica y de Fluidos, Universidad Carlos III de Madrid, Leganés 28911, Spain;2. Dept. of Mechanical Engineering, Wichita State University, Wichita, KS, USA;3. Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;4. Dept. of Chemical Engineering, McGill University, Montreal, QC, Canada |
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| Abstract: | It is known that the mass transfer characteristics of gas diffusion layers (GDLs) are closely related to cell performance in PEFCs. In this study, a method for measuring oxygen diffusivity in microporous media by means of an oxygen sensor based on a galvanic cell has been developed. This method is expected to be useful for measuring oxygen diffusivity in microporous media in a wet condition. Oxygen diffusivity in two kinds of microporous GDL media was evaluated. Experimental results indicate that diffusivity in microporous media cannot be determined on the basis of porosity alone, but that it may be influenced by some other factor, such as tortuosity. Additionally, there are some GDL materials that exhibit anisotropic diffusivity. |
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