Role of Nanoscale Inhomogeneities in Co₂FeO₄ Catalysts during the Oxygen Evolution Reaction.

ABSTRACT: Spinel-type catalysts are promising anode materials for the alkaline oxygen evolution reaction (OER), exhibiting low overpotentials and providing long-term stability. In this study, we compared two structurally equal Co₂FeO₄ spinels with nominally identical stoichiometry and substantially different OER activities. In particular, one of the samples, characterized by a metastable precatalyst state, was found to quickly achieve its steady-state optimum operation, while the other, which was initially closer to the ideal crystallographic spinel structure, never reached such a state and required 168 mV higher potential to achieve 1 mA/cm². In addition, the enhanced OER activity was accompanied by a larger resistance to corrosion. More specifically, using various

SUBMITTER: Haase FT 

PROVIDER: S-EPMC9284556 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature