南海是全球最大的太阳能辐射区之一，利用其长日照、强紫外线的海洋环境为不锈钢提供光电阴极保护具有天然的优势。针对当前TiO2涂层的光电阴极保护体系存在光吸收阈值小、光生电荷复合快及在暗态下无法提供持续保护的若干关键问题，本项目拟构筑电子储存型WO3/NiO-TiO2/石墨烯复合涂层体系，利用氢化还原法在TiO2价带顶引入连续中间能级，拓展光吸收范围；利用导空穴助催化剂NiO改善TiO2光生空穴去极化能力，提高光生载流子分离效率；利用WO3/石墨烯在还原氧化反应过程中对电子的有效存储（光照）和释放（暗态），实现TiO2复合涂层对金属的持续光电阴极保护。通过结构表征与光电性能测试，研究体系中各组分结构与性质对TiO2复合涂层的持续光电阴极保护性能的影响，明确构效关系，阐明其对不锈钢腐蚀防护的作用机制。本项目的顺利实施，为高效半导体光电材料在南海舰船腐蚀防护领域的研究与应用提供理论与技术借鉴。

The South China Sea is one of the largest solar-energy radiation zones in the world. Thus, it is naturally advantageous to provide the photocathodic protection for stainless steel in the ocean environment with the long sunshine time and strong ultraviolet radiation. For the present photocathodic protection system based on TiO2 coating, several issues still remain, including a low light absorption threshold, fast recombination of photogenetic charges, and the lack of protective effect in a dark environment. In this project, a composite coating system with electron storage ability based on WO3/NiO-TiO2/graphene is proposed. Various improved methods of the photocathodic protection performance of the TiO2 composite coating system will be developed. Firstly, the light absorption range can be greatly expanded by introducing continuous intermediate bands on the top of the valence band of TiO2 via hydrogenation reduction. Next, the separation efficiency of photogenetic carriers is promoted by improving the depolarization ability of holes with the aid of oxidation-type NiO cocatalyst. Furthermore, the long-lasting photocathodic protection will be accomplished via the effective storage under illumination and release in the darkness of electrons based on the reduction-oxidation reactions of WO3/graphene. The structure characterization and photoelectronic measurements are carried out. The objective is to research the influence of the structure and properties of each component on the long-lasting photocathodic protection performance of the TiO2 composite coating system, confirm the structure-activity relationship, and illustrate the related corrosion prevention mechanism. Outcomes of this project will be benefitting the research of high-efficient semiconductor photoelectric materials applied in the anticorrosion field of ships in the South China Sea.