The Pt(111)/Electrolyte Interface under Oxygen Reduction Reaction Conditions: An elctrochemical Impedance Spectroscopy Study

A.S. Bondarenko, Ifan Stephens, Heine Anton Hansen, F.J. Perez-Alonso, Vladimir Tripkovic, Tobias Peter Johansson, Jan Rossmeisl, Jens Kehlet Nørskov, Ib Chorkendorff

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The Pt(111)/electrolyte interface has been characterized during the oxygen reduction reaction (ORR) in 0.1 M HClO4 using electrochemical impedance spectroscopy. The surface was studied within the potential region where adsorption of OH* and O* species occur without significant place exchange between the adsorbate and Pt surface atoms (0.45−1.15 V vs RHE). An equivalent electric circuit is proposed to model the Pt(111)/electrolyte interface under ORR conditions within the selected potential window. This equivalent circuit reflects three processes with different time constants, which occur simultaneously during the ORR at Pt(111). Density functional theory (DFT) calculations were used to correlate and interpret the results of the measurements. The calculations indicate that the coadsorption of ClO4* and Cl* with OH* is unlikely. Our analysis suggests that the two-dimensional (2D) structures formed in O2-free solution are also formed under ORR conditions.
Original languageEnglish
JournalLangmuir
Volume27
Issue number5
Pages (from-to)2058
ISSN0743-7463
DOIs
Publication statusPublished - 2011

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