Oxygen reduction reaction activity and long-term stability of platinum nanoparticles supported on titania and titania-carbon nanotube composites
| Autor: | Christian Gebauer, Zenonas Jusys, Rolf Jürgen Behm, Markus Eckardt, Maximilian Wassner, Nicola Hüsing |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Rotating ring-disk electrode Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology Nanoparticle Proton exchange membrane fuel cell 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst Platinum nanoparticles Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis law.invention law Electrical and Electronic Engineering Physical and Theoretical Chemistry Composite material 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 400:580-591 |
| ISSN: | 0378-7753 |
| Popis: | Aiming at Pt nanoparticle catalysts for application in polymer electrolyte membrane fuel cell (PEMFC) cathodes, which are highly active and more corrosion resistant under realistic mobile applications than common Pt/C catalysts, we have prepared and investigated Pt catalysts supported on highly stable, nanostructured composite materials containing carbon nanotubes (CNTs) and titania. TiO2@CNT composite materials are synthesized via sol-gel processing and subsequent Pt deposition. The physical and electrochemical properties as well as the stability of these catalysts, as determined by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), rotating ring disk electrode (RRDE) measurements and accelerated degradation tests (ADTs), were compared with those of commercial Pt/C, Pt/TiO2 and Pt/CNT. The measurements reveal a high activity of the composite catalyst, comparable to that of the Pt/C catalyst, but an almost complete loss of ORR activity upon an ADT procedure simulating start-stop behavior. In contrast to carbon supported catalysts, where degradation is mainly associated with corrosion at high potentials, we find the titania supported catalysts to mainly suffer from the reductive treatment in the ADTs. Consequences for the use of Pt catalysts supported on reducible oxides such as TiO2 as cathode catalysts in fuel cell applications are discussed. |
| Databáze: | OpenAIRE |
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