Oxygen Evolution Catalysis for Iron Oxides with Various Structures

The catalytic activity on the oxygen evolution reaction (OER) was investigated for Fe3+-containing oxides with various crystal structures: spinel ZnFe2O4, post-spinel CaFe2O4, and stuffed-tridymite BaFe2O4. The latter two oxides exhibited higher catalytic activity than ZnFe2O4, indicating that the differences in the coordination polyhedra and their connections are important factors to affect OER activity.