Hydrophobic octadecylamine-functionalized graphene/TiO2 hybrid coating for corrosion protection of copper bipolar plates in simulated proton exchange membrane fuel cell environment |
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| Affiliation: | 1. Research Institute of Petroleum Industry (RIPI), P.O. Box: 14857-3311, Tehran, Iran;2. Department of Materials Science and Engineering, Sharif University of Technology, P. O. Box: 11155-4363, Tehran, Iran;3. Department of Materials and Metallurgical Engineering, Amirkabir University of Technology, P.O. Box: 15875-4413, Tehran, Iran;1. Department of Materials and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran;2. Renewable Energy Department, Niroo Research Institute (NRI), Tehran, Iran;3. Research Institute of Petroleum Industry (RIPI), Tehran, Iran;1. Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, PR China;2. School of Mechanical and Power Engineering, Dalian Ocean University, Dalian 116023, PR China;1. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, India;2. Materials Processing and Corrosion Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India |
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| Abstract: | In the present work, G-TiO2 and G-ODA-TiO2 hybrids were prepared by concurrent surface functionalization and reducing of graphene oxide (GO) using octadecylamine (ODA). The G-TiO2 and G-ODA-TiO2 powders were deposited on the copper surface by electrophoretic deposition (EPD) technique. The wettability of coatings revealed the preferable hydrophobic characteristic of G-ODA-TiO2 compared to G-TiO2 and bare copper with water contact angles of 130°, 101°, and 87°, respectively. The anti-corrosion performance of specimens in a 0.5 M H2SO4 solution was appraised by the potentiodynamic polarization (Tafel analysis), which clearly showed that G-TiO2 and G-ODA-TiO2 coatings can act as a great barrier for copper in the corrosive H2SO4 solution. The corrosion inhibition of G-TiO2 and G-ODA-TiO2 was about 2 and 15 times higher than bare copper. Moreover, the hydrophobic G-ODA-TiO2 coating on copper reached a much lower interfacial contact resistance (ICR) than the other samples. |
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| Keywords: | Hydrophobic coating Corrosion Graphene PEMFC |
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