Influence of hot-pressing temperature on the performance of PEMFC and catalytic activity |
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| Authors: | Jing-Chie Lin Chien-Ming Lai Fu-Ping Ting San-Der Chyou Kan-Lin Hsueh |
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| Affiliation: | (1) Department of Mechanical Engineering/Institute of Materials Science and Engineering, National Central University, No.300, Jhongda Rd., Jhongli City, Taoyuan County, 320, Taiwan;(2) Material and Chemical Research Laboratories, Industrial Technology Research Institute, Bldg. 77, 195-5 Chung Hsing Rd., Section 4, Chutung, Hsinchu, 310, Taiwan;(3) Taiwan Power Research Institute, Taiwan Power Company, No. 84, Ta-An Rd., Shu-Lin, Taipei County, 238, Taiwan;(4) Department of Energy and Resources, National United University, No. 1, Lianda, Gongjing Village, Miaoli City, 360, Taiwan |
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| Abstract: | The influence of hot-pressing temperature on catalytic activity and the performance of proton exchange membrane fuel cells
(PEMFCs) was investigated using current–voltage (I–V) polarization, electrochemical impedance spectroscopy (EIS) and cyclic
voltammetry (CV). EIS provided detailed information on the contribution, from high to low frequencies, of internal impedance
(Rs), interfacial impedance (Rif) and reaction impedance (Rrxn). The ohmic resistance of the cell (RΩ) was estimated from the I–V diagram for comparison with the Rs and Rif impedances. The Rif is useful for diagnosing catalytic activity and interpreting PEMFC performance. A cell was hot-pressed at 125 °C (near the
transition temperature of Nafion), an optimum temperature for lowest ohmic resistance and total impedance in response to a
maximal catalyst-specific activity. |
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| Keywords: | Proton exchange fuel cell Electrochemical impedance spectroscopy Interfacial impedance Catalyst activity Hot-pressing temperature |
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