Electromechanical diagnostic method for monitoring cracks in polymer electrolyte fuel cell electrodes
| Autor: | Byeong-Heon Jeong, Kyung-Lim Jang, Taek-Soo Kim, Jong-Gil Oh, Sanwi Kim, Bo Ki Hong |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Tension (physics) Membrane electrode assembly Energy Engineering and Power Technology 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Durability 0104 chemical sciences Fuel Technology Electrical resistance and conductance mental disorders Electrode Area density Composite material 0210 nano-technology Tensile testing |
| Zdroj: | International Journal of Hydrogen Energy. 42:11644-11653 |
| ISSN: | 0360-3199 |
| Popis: | A significantly challenging issue in polymer electrolyte fuel cells (PEFCs) is the insufficient durability of the membrane electrode assembly (MEA) electrodes caused by crack formation and growth. A decrease in interconnections of the electrical pathways in the electrodes leads to poor performance and durability of the PEFCs. Therefore, fundamental understanding of the nature of the crack formation and growth in electrodes is critical for improving fuel cell durability. In this study, an electromechanical diagnostic method is proposed to monitor the cracks in the PEFC electrodes. The electrical resistance of electrode is measured through the in situ four-wire electrical resistance measurements under tension. The crack areal density is proposed and measured as a quantitative parameter to define the presence of cracks in the electrodes using an optical microscope. It is found that the change of electrical resistances under tension increases with the electrode thickness (i.e., Pt loading), which results from the crack growth in the electrodes. This electromechanical diagnostic method is useful for understanding the crack mechanics consisting of initiation, propagation, and widening stages, and expected to facilitate the design of robust electrodes for highly durable fuel cells. |
| Databáze: | OpenAIRE |
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