期刊
CHEMICAL ENGINEERING JOURNAL
卷 393, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124675
关键词
PEMFC; 304SS bipolar plates; Carbon powders; Conducting polypyrrole coating; Corrosion
资金
- National Science & Technology Pillar Program during the Twelfth Five-year Plan Period for Seawater Desalination Technology [2015BAB08B00]
- National Key RD Plan [2017YFC0404100]
- Jiangsu Province Natural Science Foundation for Young Scholars of China [BK20160983, BK20170111]
- National Natural Science Foundation of China [21605084, 51808251]
The improvement in the long-term corrosion resistance of conducting polymer coatings was essential for protecting metal bipolar plate in proton exchange membrane fuel cell (PEMFC). In this study, carbon powders were functionalized with polydopamine (PDA) to create a more negative charge surface and their morphologies were examined by TEM test. Then, polypyrrole (PPy) coating was successfully electropolymerized on 304 stainless steel (304SS) in the presence of carbon powders (C and C-PDA powders). Therefore, the conducting property of PPy coating could be restored by incorporating carbon powders when the coating suffered aggressive attack. The structure, morphology and thermal-stability properties of the synthesized PPy, PPy/C and PPy/C-PDA coatings were investigated using SEM, AFM, FTIR and TG analysis. The anti-corrosion performances were also investigated in a simulated PEMFC working environment (0.1 M H2SO4 solution). Electrochemical tests and immersion tests showed that PPy/C-PDA coating exhibited superior long-term corrosion resistance during 720 h of immersion and the pitting phenomenon of 304SS was evidently avoided. The PPy/C-PDA coating served as a superior physical barrier and provided excellent anodic protection effect and adhesion strength, with a low interfacial contact resistance.
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