Schaefer, Sandra ; Muench, Falk ; Mankel, Eric ; Fuchs, Anne ; Brötz, Joachim ; Kunz, Ulrike ; Ensinger, Wolfgang (2015)
Double-Walled Ag–Pt Nanotubes Fabricated by Galvanic Replacement and Dealloying: Effect of Composition on the Methanol Oxidation Activity.
In: Nano, 10 (06)
doi: 10.1142/S179329201550085X
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The synthesis of bimetallic nanostructures using galvanic replacement displays a versatile route toward efficient catalysts for fuel cell reactions. We show that electrolessly plated Ag nanotubes (NTs) are a unique template for the synthesis of double-walled Ag-Pt NTs. After replacement reaction, different dealloying protocols are applied to adjust the residual Ag content. The structures were thoroughly characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, providing evidence of a hollow tube structure composed of Ag-Pt alloy. Experiments under harsh conditions reveal, that a significant amount of Ag remain in the NTs, which strongly affects the methanol oxidation performance. With optimized Ag-Pt ratio, the specific activity of Pt/C catalysts can be outperformed. From the obtained results, we emphasize that each effort using galvanic replacement should be accompanied by detailed compositional analysis.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Schaefer, Sandra ; Muench, Falk ; Mankel, Eric ; Fuchs, Anne ; Brötz, Joachim ; Kunz, Ulrike ; Ensinger, Wolfgang |
| Art des Eintrags: | Bibliographie |
| Titel: | Double-Walled Ag–Pt Nanotubes Fabricated by Galvanic Replacement and Dealloying: Effect of Composition on the Methanol Oxidation Activity |
| Sprache: | Englisch |
| Publikationsjahr: | August 2015 |
| Verlag: | World Scientific Publishing, Singapore |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Nano |
| Jahrgang/Volume einer Zeitschrift: | 10 |
| (Heft-)Nummer: | 06 |
| DOI: | 10.1142/S179329201550085X |
| Kurzbeschreibung (Abstract): | The synthesis of bimetallic nanostructures using galvanic replacement displays a versatile route toward efficient catalysts for fuel cell reactions. We show that electrolessly plated Ag nanotubes (NTs) are a unique template for the synthesis of double-walled Ag-Pt NTs. After replacement reaction, different dealloying protocols are applied to adjust the residual Ag content. The structures were thoroughly characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, providing evidence of a hollow tube structure composed of Ag-Pt alloy. Experiments under harsh conditions reveal, that a significant amount of Ag remain in the NTs, which strongly affects the methanol oxidation performance. With optimized Ag-Pt ratio, the specific activity of Pt/C catalysts can be outperformed. From the obtained results, we emphasize that each effort using galvanic replacement should be accompanied by detailed compositional analysis. |
| Freie Schlagworte: | Dealloying, electroless plating, galvanic replacement, methanol oxidation reaction, nanotube |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialanalytik 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physikalische Metallkunde 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung |
| Hinterlegungsdatum: | 08 Mär 2016 09:20 |
| Letzte Änderung: | 05 Dez 2023 09:40 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum