bei Google ScholarTitelangaben
Scholz, Manuel ; Scheiba, Frieder ; Cao, Lin ; Schafranek, Robert ; Roth, Christina ; Cremers, Carsten ; Qiu, Xinping ; Stimming, Ulrich ; Fuess, Hartmut:
On the suitability of hydrous ruthenium oxide supports to enhance intrinisic proton conductivity in direct methanol anodes.
In: Fuel Cells.
Bd. 6
(2006)
Heft 6
.
- S. 439-446.
ISSN 1615-6854
DOI: https://doi.org/10.1002/fuce.200500238
Abstract
Hydrous ruthenium oxides have been investigated as novel support materials for fuel cell electrocatalysts for use in DMFC applications. These oxides were chosen in particular due to their potential intrinsic proton conductivity. Pt nanoparticles have been deposited onto the new support, and the resulting catalysts characterized both structurally and electrochemically. The Pt nanoparticles are sized between 3?4 nm and are highly dispersed on the support. Transmission electron micrographs show that the individual Pt nanoparticles are covered by an amorphous coating layer ? probably hydrous ruthenium oxide, in good agreement with the XPS data. Electrochemical measurements on model electrodes indicate that proton conductivity of the supporting material is strongly affected by interdiffusion of methanol. Nevertheless, initial tests on membrane electrode assemblies (MEAs) showed improved performance, particularly with respect to internal resistance, when compared to Pt-Ru black. The catalyst showed very high activity in CO stripping experiments performed on a full MEA, suggesting high catalyst utilization, despite the comparatively low Nafion? content used in the electrode layer.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | DMFC; Hydrous Ruthenium Oxide; Intrinsic Proton Conductivity; Percolation Theory; Support; Three-Phase Boundary |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverfahrenstechnik > Lehrstuhl Werkstoffverfahrenstechnik - Univ.-Prof. Dr. Christina Roth Fakultäten Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverfahrenstechnik |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 23 Apr 2021 08:20 |
| Letzte Änderung: | 05 Apr 2022 06:58 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/64899 |