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Elucidation of the Oxygen Reduction Volcano in Alkaline Media using a Copper‐Platinum(111) Alloy

Herein we experimentally explore the relationship between the binding of the reaction intermediates and oxygen reduction activity in alkaline media. By introducing Cu into the 2nd surface layer of a Pt(111) single crystal, we tune the surface reactivity. We demonstrate that in both NaOH and KOH, the optimal catalyst should exhibit OH binding ~0.1 eV weaker than Pt(111), via a Sabatier volcano; this observation suggests that the reaction is mediated via the same surface bound intermediates as in acid, in contrast to previous reports. In 0.1 M KOH, the alloy catalyst at the peak of the volcano exhibits a maximum activity of 101±8 mA/cm2 at 0.9 V vs. a reversible hydrogen electrode (RHE). This activity constitutes a ~60‐fold increase over Pt(111) in 0.1 M HClO4.

Autoren:   Kim Degn Jensen, Jakub Tymoczko, Jan Rossmeisl, Aliaksandr Bandarenka, Ib Chorkendorff, Maria Escudero-Escribano, Ifan Erfyl Lester Stephens
Journal:   Angewandte Chemie International Edition
Jahrgang:   2018
Seiten:   n/a
DOI:   10.1002/anie.201711858
Erscheinungsdatum:   18.01.2018
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