Cobalt(II,III) oxide (Co₃O₄) is a mixed-valence cobalt oxide with applications in catalysis, batteries, and pigments. It exhibits both spinel structure stability and redox activity, making it valuable in industrial and research fields. https://www.noahchemicals.com/product/cobalt-ii-iii-oxide-99-5-pure-325-mesh-cobaltous-cobaltic-oxide-co%e2%82%83o%e2%82%84/