Synergistic regulation of coordination sites of Co3O4 by selective doping for efficient water oxidation

Abstract

Herein, we designed selectively doped Co₃O₄ to explore the effect of coordination sites, in which the octahedral and tetrahedral sites were modulated by simple doping with ions of different radiuses (Al and In). Compared to octahedral regulation, the synergistic regulation of both tetrahedral sites and octahedral sites can induce a higher intrinsic activity, which is because they possess improved electrical conductivity and facilitate the formation of highly active Co³⁺/Co⁴⁺ species during the oxygen evolution reaction (OER).