Journal article
Elucidation of the Oxygen Reduction Volcano in Alkaline Media using a Copper-Platinum(111) Alloy
The relationship between the binding of the reaction intermediates and oxygen reduction activity in alkaline media was experimentally explored. By introducing Cu into the 2nd surface layer of a Pt(111) single crystal, the surface reactivity was tuned. In both 0.1 m NaOH and 0.1 m KOH, the optimal catalyst should exhibit OH binding circa 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 circa 60‐fold increase over Pt(111) in 0.1 m HClO4.
Language: | English |
---|---|
Publisher: | Wiley |
Year: | 2018 |
Pages: | 2850-2855 |
ISSN: | 15213757 and 00448249 |
Types: | Journal article |
DOI: | 10.1002/ange.201711858 |
ORCIDs: | 0000-0002-6432-3015 , Stephens, Ifan E. L. and Chorkendorff, Ib |
Elektrokatalyse Oberflächenchemie Platin Sabatier-Prinzip Sauerstoffreduktion