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Reier, T. ; Teschner, D. ; Lunkenbein, Thomas ; Bergmann, A. ; Selve, S. ; Kraehnert, R. ; Schlögl, R. ; Strasser, P.:
Electrocatalytic Oxygen Evolution on Iridium Oxide : Uncovering Catalyst-Substrate Interactions and Active Iridium Oxide Species.
In: Journal of the Electrochemical Society.
Bd. 161
(2014)
Heft 9
.
- F876.
ISSN 1945-7111
DOI: https://doi.org/10.1149/2.0411409jes
Abstract
The morphology, crystallinity, and chemical state of well-defined Ir oxide nanoscale thin-film catalysts prepared on Ti substrates at various calcination temperatures were investigated. Special emphasis was placed on the calcination temperature-dependent interaction between Ir oxide film and Ti substrate and its impact on the electrocatalytic oxygen evolution reaction (OER) activity. The Ir oxide films were characterized by scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and cyclic voltammetry. Furthermore, temperature programmed reduction was applied to study the Ir oxide species formed as a function of calcination temperature and its interaction with the Ti substrate. A previously unachieved correlation between the electrocatalytic OER activity and the nature and structural properties of the Ir oxide film was established. We find that the crystalline high temperature Ir oxide species is detrimental, whereas low temperature amorphous Ir oxy-hydroxides are highly active and efficient catalysts for the OER. Moreover, at the highest applied calcination temperature (550 degrees C), Ti oxides, originating from the substrate, strongly affect chemical state and electrocatalytic OER activity of the Ir oxide film.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | WOS:000340019600077 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 12 Jun 2025 11:51 |
| Letzte Änderung: | 12 Jun 2025 11:51 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93743 |