Stabilizing Single-Atom Iron Electrocatalysts for Oxygen Reduction via Ceria Confining and Trapping

Atomically dispersed Fe–N–C materials recently hold great interest in costly Pt substitution for the cathodic oxygen reduction reaction of fuel cells. However, the heat treatment involved in the material preparation excites Fe aggregating into nanosized species with low activity rather than single-atom Fe sites. Herein, we propose a “ceria-assisted” strategy to preferentially generate active single-atom Fe sites in Fe–N–C materials, which...