Two dimensional distribution measurement of electric current generated in a polymer electrolyte fuel cell using 49 NMR surface coils
| Autor: | Kumiko Tsujinaka, Kuniyasu Ogawa, Shigeki Yoneda, Tatsuyoshi Sasaki, Ritsuko Asai |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Magnetic Resonance Spectroscopy Polymers Biomedical Engineering Biophysics 02 engineering and technology Electrolyte 010402 general chemistry 01 natural sciences Electrolytes Electric Power Supplies Electricity Electrochemistry Radiology Nuclear Medicine and imaging Electrodes Membrane electrode assembly Water Mechanics Equipment Design 021001 nanoscience & nanotechnology 0104 chemical sciences Electricity generation Electric power Granularity Electric current Current (fluid) 0210 nano-technology Current density |
| Zdroj: | Magnetic resonance imaging. 51 |
| ISSN: | 1873-5894 |
| Popis: | In order to increase the current density generated in a PEFC (polymer electrolyte fuel cell), a method for measuring the spatial distribution of both the current and the water content of the MEA (membrane electrode assembly) is necessary. Based on the frequency shifts of NMR (nuclear magnetic resonance) signals acquired from the water contained in the MEA using 49 NMR coils in a 7 × 7 arrangement inserted in the PEFC, a method for measuring the two-dimensional spatial distribution of electric current generated in a unit cell with a power generation area of 140 mm × 160 mm was devised. We also developed an inverse analysis method to determine the two-dimensional electric current distribution that can be applied to actual PEFC connections. Two analytical techniques, namely coarse graining of segments and stepwise search, were used to shorten the calculation time required for inverse analysis of the electric current map. Using this method and techniques, spatial distributions of electric current and water content in the MEA were obtained when the PEFC generated electric power at 100 A. |
| Databáze: | OpenAIRE |
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