Acetylene-Treated Titania Nanotube Arrays (TNAs) as Support for Oxygen Reduction Reaction (ORR) Platinum Thin Film Catalysts
| Autor: | Sebastian Proch, Naoko Takahashi, Shuhei Yoshino, Kensaku Kodama, Yu Morimoto, Naohiko Kato, Satoru Kosaka, Itaru Gunjishima |
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| Rok vydání: | 2017 |
| Předmět: |
Nanotube
Materials science Inorganic chemistry chemistry.chemical_element Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Overlayer Catalysis chemistry Monolayer Electrochemistry Thin film 0210 nano-technology Platinum Layer (electronics) |
| Zdroj: | Electrocatalysis. 8:351-365 |
| ISSN: | 1868-5994 1868-2529 |
| Popis: | Platinum layers show higher specific oxygen reduction reaction (ORR) activities than nanoparticles, and smooth monolayers of platinum on polycrystalline gold have been achieved by electrodeposition from CO-saturated solutions. Since Pt monolayers are interesting catalytic systems, this methodology was attempted on acetylene-treated titania nanotubes (TNAs) with high conductivity. However, the investigation of the as-treated TNAs found that probably nanotubes with an oxygen-containing graphitic overlayer were formed. It was observed that deposition after partial oxidative removal of the overlayer led to very low ORR activities while deposition on the intact overlayer gave rise to the highest activities obtained in our research so far. This is attributed to a “tie-layer” effect, in which the carbon layer screens the negative effects of the underlying TiO2 layer. The interesting effects of the graphitic overlayer on the ORR activity of the Pt deposits on acetylene-treated TNAs offer a strategy to mitigate the unfavorable interactions of the Pt/TiO2 interface. However, the carbon layer in this study was found not to be stable upon potential cycling. |
| Databáze: | OpenAIRE |
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