Role of Surface Iron in Enhanced Activity for the Oxygen Reduction Reaction on a Pd₃Fe(111) Single‐Crystal Alloy

Abstract

Working together: Pd0.9Fe0.1–Pd3Fe(111) (see picture, Pd adatoms yellow, Fe purple, Pd blue-green, O red, H white) displays enhanced performance for the oxygen reduction reaction with five to eight times higher activity than Pd(111). The high catalytic activity may originate from a cooperative effect of a segregated Pd layer with its large tendency to remove surface O species by protonation and active Fe with its ability to dissociate O2. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.