Corrosion resistance of poly p-phenylenediamine conducting polymer coated 316L SS bipolar plates for Proton Exchange Membrane Fuel Cells |
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| Affiliation: | 1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240, PR China;1. School of Defense Science, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan;2. Department of Chemical & Materials Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan;3. Department of Power Vehicle and Systems Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan;1. Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, PR China;2. School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, 693 Xiongchu Avenue, Wuhan 430073, PR China;3. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, PR China;4. School of Materials Science and Engineering, University of New South Wales, NSW 2052, Australia;5. Guangdong Monte-bianco New Materials Co., Ltd., Foshan 528313, PR China;6. School of Mechanical Engineering, University of Adelaide, SA 5005, Australia |
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| Abstract: | The usage of conducting polymers as coating materials for bipolar plates to prevent corrosion is the recent trend in Proton Exchange Membrane Fuel Cell (PEMFC) technology. Paraphenylenediamine (pPD) monomer was electropolymerized to poly p-phenylenediamine (PpPD) over 316L SS. The characterization of PpPD, the conducting polymer coating, over 316L SS was done using attenuated total reflectance infra-red (ATR-IR) spectroscopy to confirm the formation of PpPD. The surface morphology and topography were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The corrosion protection performance of the coating was evaluated using open circuit potential (OCP) measurement, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies in PEMFC environment. EIS studies revealed that the charge transfer resistance for the coated substrates has increased by one order of magnitude than the bare substrate. Potentiodynamic polarization studies have registered lower corrosion current density by one order magnitude for the 0.06 M pPD coated substrate than the bare substrate and the polarization resistance values for the coated substrates have increased by two and a half time than the bare substrate. These results showed that PpPD coated substrates exhibited enhanced corrosion resistance in PEMFC environment. |
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| Keywords: | PEM fuel cell Bipolar plates 316L SS Conducting polymer Electrochemical impedance spectroscopy Potentiodynamic polarization |
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