Scheiba, Frieder ; Scholz, Manuel ; Cao, Lin ; Roth, Christina ; Cremers, C. ; Qiu, X. ; Stimming, U. ; Fuess, Hartmut (2006)
On the suitability of hydrous ruthenium oxide supports to enhance intrinisic proton conductivity in direct methanol anodes.
In: Fuel cells, 6
doi: 10.1002/fuce.200500238
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2006 |
| Autor(en): | Scheiba, Frieder ; Scholz, Manuel ; Cao, Lin ; Roth, Christina ; Cremers, C. ; Qiu, X. ; Stimming, U. ; Fuess, Hartmut |
| Art des Eintrags: | Bibliographie |
| Titel: | On the suitability of hydrous ruthenium oxide supports to enhance intrinisic proton conductivity in direct methanol anodes |
| Sprache: | Englisch |
| Publikationsjahr: | Dezember 2006 |
| Verlag: | WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Fuel cells |
| Jahrgang/Volume einer Zeitschrift: | 6 |
| DOI: | 10.1002/fuce.200500238 |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | DMFC, Hydrous Ruthenium Oxide, Intrinsic Proton Conductivity, Percolation Theory, Support, Three-Phase Boundary |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Erneuerbare Energien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung |
| Hinterlegungsdatum: | 20 Nov 2008 08:28 |
| Letzte Änderung: | 20 Feb 2020 13:23 |
| PPN: | |
| Sponsoren: | Financial support from the DFG and the Sino-German centre in Dalian in a joint project between the ZAE Bayern (Garching, Germany), the School of Chemistry (Tsinghua University, Beijing, China),, and the Institute of Materials Science (Darmstadt University of Technology, Germany) are gratefully acknowledged. |
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