Journal article
Elucidating the activity of stepped Pt single crystals for oxygen reduction
Ruhr University Bochum1
Department of Energy Conversion and Storage, Technical University of Denmark2
Atomic Scale Materials Modelling, Department of Energy Conversion and Storage, Technical University of Denmark3
Center for Atomic-scale Materials Design, Centers, Technical University of Denmark4
Department of Physics, Technical University of Denmark5
Surface Physics and Catalysis, Department of Physics, Technical University of Denmark6
The unexpectedly high measured activity of Pt[n(111) × (111)] and Pt[n(111) × (100)] stepped single crystal surfaces towards the oxygen reduction reaction (ORR) is explained utilizing the hydroxyl binding energy as the activity descriptor. Using this descriptor (estimated using experimental data obtained by different groups), a well-defined Sabatier-type volcano is observed for the activities measured for the Pt[n(111) × (111)] and Pt[n(111) × (100)] stepped single crystals, in remarkable agreement with earlier theoretical studies.
We propose that the observed destabilisation of *OH species at these surfaces is due to the decreased solvation of the adsorbed hydroxyl intermediates on adjacent terrace sites.
Language: | English |
---|---|
Publisher: | The Royal Society of Chemistry |
Year: | 2014 |
Pages: | 13625-13625 |
ISSN: | 14639084 and 14639076 |
Types: | Journal article |
DOI: | 10.1039/c4cp00260a |
ORCIDs: | Hansen, Heine Anton and Stephens, Ifan |