Hydrophobic octadecylamine-functionalized graphene/TiO2 hybrid coating for corrosion protection of copper bipolar plates in simulated proton exchange membrane fuel cell environment
| Autor: | Mohammad Reza Hadidi, Ali Nemati, Delaram Salehzadeh, Z. Sadeghian |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Tafel equation
Materials science Renewable Energy Sustainability and the Environment Oxide Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Copper 0104 chemical sciences Corrosion Contact angle Electrophoretic deposition chemistry.chemical_compound Fuel Technology Coating chemistry Chemical engineering engineering Surface modification 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 45:15380-15389 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.04.015 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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