Elucidating the activity of stepped Pt single crystals for oxygen reduction

Aliaksandr S. Bandarenka, Heine Anton Hansen, Jan Rossmeisl, Ifan Stephens

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number27
Pages (from-to)13625-13625
Number of pages5
ISSN1463-9076
DOIs
Publication statusPublished - 2014

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