Photocathodic protection coating is an emerging anticorrosion technology that combines the protective characteristics of coating and cathodic protection. TiO2 is stable and easy to prepare; however, it suffers from a low sunlight utilization rate and low photoelectric conversion efficiency. The construction of TiO2-based heterojunction coatings provides an effective solution to these challenges. This work summarizes the synthesis methods of TiO2-based heterojunction coatings, explores the charge-transfer mechanisms associated with various types of heterojunction coatings (e.g., type II heterojunction, p–n junction, Schottky junction, and Z-scheme heterojunction), and reviews the characterization methods used for heterojunction analysis. Finally, the application prospects and future research directions of TiO2-based heterojunction coatings are proposed. This study will help researchers understand the fabrication process and application of TiO2-based heterojunction coatings in photocathodic protection.
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Xu et al. (2024) studied this question.
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