Study of the electrodeposition of conductive polypyrrole doped saccharin coatings on 316L stainless steel plate for PEMFC application
2025
Ben Jadi, S. | Bahend, K. | El Fazdoune, M. | Iranzo Paricio, José Alfredo | García-García, Francisco J. | Bazzaoui, M. | Universidad de Sevilla. Departamento de Ingeniería Energética | Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte | Ministerio de Ciencia e Innovación (MICIN). España | Agencia Estatal de Investigación. España
This is an open access article under the CC BY-NC license ( http://creativecommons.org/licenses/by-nc/4.0/ ).
Показать больше [+] Меньше [-]The study investigates the electrosynthesis of pyrrole doped with sodium saccharin as a protective coating for AISI 316L bipolar plate. Electropolymerization durations are systematically varied to optimize corrosion inhibition under different concentrationa of the aggressive environment of typical of PEMFC operation. Weight loss measurements indicated that films synthetized during 30 min period exhibit superior corrosion resistance compared to those produced under shorter durations. Electrochemical assessments, including potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS), demonstrate that the sodium saccharin doped PPy coating significantly reduces the polarisation density of 316L. detailed structural and morphological analyses were conducted using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). XPS confirmed the successful incorporation of the saccharin dopant in the PPy matrix with dopant rates increasing under aggressive acidic condition. While SEM reveals that PPy coatings formed through extended electropolymerization enhance corrosion resistance on AISI 316L through their densely cauliflower structure. The enhanced long-term corrosion protection observed can be attributed to the robust physical barrier and source of anodic protection compared to uncoated 316L.
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