Electrodeposition of conductive PAMT/PPY bilayer composite coatings on 316L stainless steel plate for PEMFC application
| Autor: | P. Kalaiselvi, S. Chellammal, Akhila Kumar Sahu, Srinu Akula |
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| Rok vydání: | 2021 |
| Předmět: |
Conductive polymer
Materials science Renewable Energy Sustainability and the Environment Bilayer Energy Engineering and Power Technology Proton exchange membrane fuel cell 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Polypyrrole 01 natural sciences 0104 chemical sciences Corrosion chemistry.chemical_compound Fuel Technology Coating chemistry engineering Composite material Cyclic voltammetry 0210 nano-technology Polarization (electrochemistry) |
| Zdroj: | International Journal of Hydrogen Energy. 46:17909-17921 |
| ISSN: | 0360-3199 |
| Popis: | Stainless steel fulfills most of the requirements as bipolar plates in Proton Exchange Membrane Fuel Cell. However, it undergoes severe corrosion in fuel cell operating condition. This can be resolved by coating the stainless steel with corrosion resistive conducting polymers. In this study, homogeneous and adherent conductive Poly(2-amino-5-mercapto-1,3,4- thiadiazole)/Polypyrrole (PAMT/PPY) mono and bilayer polymer composite coatings are electrosynthesized on 316L SS in 0.5 M H2SO4 by cyclic voltammetry and chronopotentiometry. The hydrophobicity and surface morphology of the coatings are analyzed by contact angle and scanning electron microscopy respectively. The polymer coatings are evaluated in 0.5 M H2SO4 medium by potentiodynamic polarization and impedance techniques at 25 °C. The polarization results reveal that PAMT on PPY composite coating shifts the Ecorr of the 316L SS towards noble direction. The EIS study reveals that the Rf value of PAMT on PPY coating is significantly higher by three orders (x103 Ωcm2) of magnitude than uncoated 316L SS. The corrosion performance of the coatings in simulated PEMFC environment is investigated by potentiodynamic and potentiostatic studies. Results show that the PAMT on PPY and PPY on PAMT bilayer coatings are stable and increased the corrosion potential by about 410–470 mV and 275–310 mV (SCE) in simulated cathodic and anodic conditions respectively. This investigation reports that the PAMT on PPY bilayer coating is serving as a good physical barrier and protecting the 316L SS against corrosion in PEMFC environment. |
| Databáze: | OpenAIRE |
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