Title data
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.
Vol. 6
(2006)
Issue 6
.
- pp. 439-446.
ISSN 1615-6854
DOI: https://doi.org/10.1002/fuce.200500238
Abstract in another language
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.
Further data
Item Type: | Article in a journal |
---|---|
Refereed: | Yes |
Keywords: | DMFC; Hydrous Ruthenium Oxide; Intrinsic Proton Conductivity; Percolation Theory; Support; Three-Phase Boundary |
Institutions of the University: | Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering > Chair Electrochemical Process Engineering - Univ.-Prof. Dr. Christina Roth Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering |
Result of work at the UBT: | No |
DDC Subjects: | 500 Science > 540 Chemistry 600 Technology, medicine, applied sciences > 620 Engineering |
Date Deposited: | 23 Apr 2021 08:20 |
Last Modified: | 05 Apr 2022 06:58 |
URI: | https://eref.uni-bayreuth.de/id/eprint/64899 |