Construction of a Z-scheme heterojunction with camellia-like MnCo2O4/TiO2 for photogenerated cathodic protection

Abstract

A photogenerated cathodic protection system powered by solar energy has been proposed to reduce metal corrosion in the ocean. By establishing heterojunctions between semiconductors, the absorption of visible light is improved, effectively separating photogenerated carriers and enhancing the protective effect. In this study, we designed a flower shaped MnCo₂O₄ modified TiO₂ with a Z-scheme heterojunction to enhance its redox ability for photogenerated cathodic protection. Electrochemical tests have shown that the coupling of MnCo₂O₄/TiO₂ with 304 stainless steel (304SS) can effectively improve the photocatalytic cathodic protection effect under light irradiation. Based on the results of UV photoelectron spectroscopy testing, the Z-scheme interface charge transfer path can be determined, which improves the redox performance of the composite material.