bei Google ScholarTitelangaben
Deka, Nipon ; Jones, Travis E. ; Falling, Lorenz J. ; Sandoval-Diaz, Luis-Ernesto ; Lunkenbein, Thomas ; Velasco-Vélez, Juan-Jesús ; Chan, Ting-Shan ; Chuang, Cheng-Hao ; Knop-Gericke, Axel ; Mom, Rik V.:
On the Operando Structure of Ruthenium Oxides during the Oxygen Evolution Reaction in Acidic Media.
In: ACS Catalysis.
Bd. 13
(2023)
Heft 11
.
- S. 7488-7498.
ISSN 2155-5435
DOI: https://doi.org/10.1021/acscatal.3c01607
Abstract
In the search for rational design strategies for oxygenevolutionreaction (OER) catalysts, linking the catalyst structure to activityand stability is key. However, highly active catalysts such as IrO x and RuO x undergostructural changes under OER conditions, and hence, structure-activity-stabilityrelationships need to take into account the operando structure ofthe catalyst. Under the highly anodic conditions of the oxygen evolutionreaction (OER), electrocatalysts are often converted into an activeform. Here, we studied this activation for amorphous and crystallineruthenium oxide using X-ray absorption spectroscopy (XAS) and electrochemicalscanning electron microscopy (EC-SEM). We tracked the evolution ofsurface oxygen species in ruthenium oxides while in parallel mappingthe oxidation state of the Ru atoms to draw a complete picture ofthe oxidation events that lead to the OER active structure. Our datashow that a large fraction of the OH groups in the oxide are deprotonatedunder OER conditions, leading to a highly oxidized active material.The oxidation is centered not only on the Ru atoms but also on theoxygen lattice. This oxygen lattice activation is particularly strongfor amorphous RuO x . We propose that thisproperty is key for the high activity and low stability observed foramorphous ruthenium oxide.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | WOS:001012188700001 |
| 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 09:38 |
| Letzte Änderung: | 12 Jun 2025 09:38 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93674 |