4.7 Article

Electrodeposition of conductive PAMT/PPY bilayer composite coatings on 316L stainless steel plate for PEMFC application

期刊

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 46, 期 34, 页码 17909-17921

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.02.196

关键词

Electrodeposition; Bipolar plates; Corrosion-resistance coating; Stainless steel; PEM fuel Cells

资金

  1. CSIR, New Delhi, India under FTT project scheme
  2. CSIRCECRI, Karaikudi, India

向作者/读者索取更多资源

This study successfully synthesized conductive polymer composite coatings in 0.5 M H2SO4, which shifted the corrosion potential of 316L SS in a noble direction and significantly enhanced its corrosion resistance compared to uncoated stainless steel. The PAMT on PPY bilayer coating acted as a good physical barrier, protecting the stainless steel against corrosion in the PEMFC environment.
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 degrees 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 Ucm(2)) 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. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

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