Fe2TiO5/Fe2O3 (Shell/Shell) and (Shell/Core) Heterostructured for Efficient Oxygen Evolution.

A delicate synthesis strategy of Fe2TiO5/Fe2O3 (shell/shell (s/s)) and (shell/core (s/c)) heterostructures was proposed to realize efficient photocatalytic water oxidation. The hierarchical structure increases the light absorption depth of material, the strongly coupled components promoted the separation of photoinduced excitons, and the high surface area with adequate porosity allowed the diffusion of electrolyte to adsorb at rich active sites. Furthermore, Fe2TiO5/Fe2O3 (s/s) was coated by graphitic carbon nitride (g-CN) subunits and exhibited good photocatalytic water reduction, resulting from the contact interface accelerating the effective separation of electrons and holes.