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Tuesday, 29 September 2020
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Raw materials & technologies, Applications

Anti-corrosion of electrodeposited graphene/polypyrrole composite coating

Thursday, 19 December 2019

A polypyrrole/graphene composite coating was directly electrodeposited on 304 stainless steel by cyclic voltammetry technique from a solution of pyrrole and graphene.

The researchers investigated the anti-corrosion and conductivity of the electrodeposited graphene/polypyrrole composite coating for metallic bipolar plates. Source: Foto-Ruhrgebiet – stock.adobe.com.
The researchers investigated the anti-corrosion and conductivity of the electrodeposited graphene/polypyrrole composite coating for metallic bipola...

The structure and morphology of the composite were characterised by a combination of Infrared spectrometer, Raman spectroscopy, and scanning electron microscopy. The typical characteristic peaks of graphene are detected in the composite, conforming with the successful doping of graphene. The corrosion of the composite was investigated in the environment of a proton exchange membrane fuel cell, and its performance was compared to that of a single polypyrrole coating and substrate.

Composite containing graphene with good conductivity and corrosion resistance

The composite coating enhances the corrosion resistance of the substrate more effectively than the single polypyrrole coating, as it deceases corrosion current density of substrate and maintains a high open-circuit potential throughout the whole immersion. Furthermore, the composite coating possesses higher chemical stability and better conductivity than polypyrrole coating. This is mainly attributed to the structure of composite containing graphene, which has good conductivity and is corrosion resistant. Therefore, the composite coating is a promising candidate coating for metallic bipolar plates.

The study is published in: Progress in Organic Coatings Volume 136, November 2019, 105237.

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