at Google ScholarTitle data
Roth, Christina ; Papworth, Adam J. ; Hussain, Irshad ; Nichols, Richard J. ; Schiffrin, David J.:
A Pt/Ru nanoparticulate system to study the bifunctional mechanism of electrocatalysis.
In: Journal of Electroanalytical Chemistry.
Vol. 581
(2005)
Issue 1
.
- pp. 79-85.
ISSN 1572-6657
DOI: https://doi.org/10.1016/j.jelechem.2005.04.014
Abstract in another language
The reduced sensitivity of Pt-Ru alloys towards CO poisoning results from two effects: the ligand effect and the bifunctional mechanism. Although these have been known for many years, their applicability to nanoparticle electrocatalysts remains unclear, Furthermore, it is not known if the formation of a Pt-Ru alloy is necessary to improve the catalyst tolerance to CO or if the presence of Ru in immediate proximity to Pt nanoparticles (non-alloy systems) brings about a significant change. A new approach to the detailed investigation of the underlying mechanisms is presented by using mixtures of surfactant-stabilised Pt and Ru nanoparticles attached to an oxidised glassy carbon electrode. After CO activation the particle-decorated carbon surfaces become active for the methanol oxidation reaction as a result of the removal of part or all of the surfactant shell. However, despite this activation the onset potential and the peak maximum for both CO and methanol oxidation remain unchanged, independently of the mixture composition, whereas the maximum current decreases with increasing Ru content. Scanning transmission electron microscopy (STEM) investigations confirmed the close proximity between Pt and Ru nanoparticles on the electrode surface. However, no enhancement of activity was observed which may be due to the presence of small amounts of capping ligands preventing direct metal contact between the Ru and Pt nanoparticles.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Keywords: | Bifunctional mechanism; CO activation; Cyclic voltammetry; Methanol oxidation; Pt; Ru; Nanoparticles |
| 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 07:24 |
| Last Modified: | 23 Apr 2021 07:24 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/64889 |