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Hydrophobic octadecylamine-functionalized graphene/TiO2 hybrid coating for corrosion protection of copper bipolar plates in simulated proton exchange membrane fuel cell environment

Sadeghian, Z ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijhydene.2020.04.015
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. 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. © 2020 Hydrogen Energy Publications LLC
  6. Keywords:
  7. Corrosion ; Hydrophobic coating ; PEMFC ; TiO2 ; Copper corrosion ; Electrophoresis ; Graphene ; Hydrophobicity ; Proton exchange membrane fuel cells (PEMFC) ; Titanium dioxide ; Anticorrosion performance ; Corrosion inhibition ; Electrophoretic deposition techniques ; Functionalized graphene ; Interfacial contact resistance ; Octadecylamines ; Surface Functionalization ; Water contact angle ; Corrosion resistant coatings
  8. Source: International Journal of Hydrogen Energy ; Volume 45, Issue 30 , 2020 , Pages 15380-15389
  9. URL: https://www.sciencedirect.com/science/article/pii/S0360319920313264