The catalytic oxidation of carbon monoxide at the platinum/electrolyte interface investigated by optical second harmonic generation (SHG): Comparison of Pt(111) and Pt(997) electrode surfaces

W. Akemann, K. A. Friedrich, U. Linke, U. Stimming

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

41 Zitate (Scopus)

Abstract

The anodic oxidation of CO on nominal Pt(111) and Pt(997) electrodes in a CO-saturated 0.1 M HClO4 electrolyte is studied by optical second harmonic generation (SHG) at a wavelength of 280 nm to monitor the CO adlayer under steady-state reaction conditions in the potential range between 50 mV and 1030 mV vs. RHE. Regarding the catalytic activity of the electrodes, two potential regimes are distinguishable: in the low potential regime, characterized by the presence of a dense CO overlayer, the reaction yield is higher on Pt(997) than on Pt(111). Positive of the overlayer stripping potential [880 mV for Pt(111) and 780 mV for Pt(997)] the Pt(997) electrode exhibits an inferior reactivity. The results confirm the structure sensitivity of anodic CO oxidation on Pt electrode surfaces.

OriginalspracheEnglisch
Seiten (von - bis)571-575
Seitenumfang5
FachzeitschriftSurface Science
Jahrgang402-404
DOIs
PublikationsstatusVeröffentlicht - 15 Mai 1998

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