Electrochemical corrosion characteristics of conducting polypyrrole/polyaniline coatings in simulated environments of a proton exchange membrane fuel cell

A bilayer conducting polymer coating consisting of an inner layer of polypyrrole (Ppy) with large dodecylsulfate ionic groups and an external polyaniline (Pani) layer with small SO42− groups was electrodeposited on type 304 stainless steel bipolar plates of a proton-exchange membrane fuel cell (PEMF...

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Bibliographic Details
Published in:International journal of hydrogen energy 2016-06, Vol.41 (20), p.8542-8549
Main Authors: Ren, Y.J., Chen, J., Zeng, C.L., Li, C., He, J.J.
Format: Article
Language:English
Subjects:
Anodic
Austenitic stainless steels
Coatings
Conduction
Corrosion
Corrosion environments
Polyanilines
Polypyrrole/polyaniline bilayer coatings
Polypyrroles
Proton exchange membrane fuel cell
Proton exchange membrane fuel cells
Simulation
Stainless steel bipolar plates
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Summary:A bilayer conducting polymer coating consisting of an inner layer of polypyrrole (Ppy) with large dodecylsulfate ionic groups and an external polyaniline (Pani) layer with small SO42− groups was electrodeposited on type 304 stainless steel bipolar plates of a proton-exchange membrane fuel cell (PEMFC). The corrosion performance of conducting Ppy/Pani bilayer coatings on 304SS in simulated cathode and anode environments (0.1 M H2SO4 solution bubbled with air or H2 at 80 °C) of a PEMFC was investigated by electrochemical impedance spectroscopy, polarization and open circuit potential measurements. The experimental results showed that the Ppy/Pani bilayer increased the free corrosion potential of the steel by about 310 mV (SCE) and 270 mV (SCE) in simulated cathodic and anodic environments of the PEMFC, respectively. Long-term exposure studies showed that the bilayer was highly stable and inhibited the corrosion of the steel effectively in simulated cathodic and anodic environments, which was attributed to its “self-healing” effect. •Ppy/Pani bilayer coatings on stainless steel bipolar plates of PEMFC were studies.•The bilayer coatings kept high stability in simulated cathodic environment.•The external Pani film could oxidize inner Ppy in situ as an anions reservoir.•The bilayer exhibited the self-healing capacities in the corrosive solution.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2016.03.184