为了全面提升光催化反应关键过程的效率，即赋予目标合成材料更高的氧化还原电位、更快的电荷分离迁移速率和丰富的反应活性位点，本项目拟通过集成铁电极化电场、Z型异质结和二维超薄结构，构建极性2D-2D g-C3N4/层状铋系材料Z型结复合光催化材料。通过优化制备工艺和确定电晕极化最佳强度，为制备高效光催化材料提供可靠的新方法。通过系统的光催化氧化还原性能测试，阐明铁电极化—Z型结—电荷分离迁移—光催化性能之间的关系。采用铁电测试系统和KPFM获得铁电性能参数和表面电势差等信息，通过ESR等技术手段检测反应活性物种，通过选择性光沉积实验明确反应活性位点，结合第一性原理计算极化率、不同晶轴上光生电子空穴的有效质量、界面处原子状态和接触力类型，揭示铁电极化和Z型结对活性位点的调控机制。在深入理解光催化氧化还原反应机制的同时，提出一套基于铁电极化、Z型结和超薄结构的“三合一”协同促进光催化活性新思路。

In order to improve the efficiency of the key processes of photocatalysis, that is, to give the target material higher redox potential, faster charge separation and migration rate, and abundant reactive sites, this project intends to develop a strategy combining ferroelectric polarization electric field, Z-junction and ultrathin structure to construct the polar 2D-2D g-C3N4/layered bismuth materials Z-junction composite photocatalysts. By optimizing the preparation process and determining the best intensity of corona polarization, a reliable new method for the preparation of high-efficiency photocatalytic materials will be provided. The relationship between ferroelectric polarization, Z-junction, charge separation and migration, and photocatalysis will be clarified through the systematic analysis of photocatalytic oxidation-reduction performance. The ferroelectric parameters and surface potential difference will be obtained by using the ferroelectric test system and KPFM. The reactive species will be detected by ESR and other technologies. The reactive sites will be determined by selective photodeposition experiment. And the first-principle calculation are employed to study the polarizability, effective mass of photogenerated electrons/holes along different crystal axes, the state of atoms and the type of contact force at the interface, revealing the relationship between the ferroelectric polarization and reactive sites. It will help to in-depth understand the photocatalytic reaction mechanism, and meanwhile to provide an effective "Three in One" strategy for promoting photocatalytic activity through Z-junction construction, ferroelectricity enhancement and ultrathin structure fabrication, which will furnish a reference for the discovery and design of composite photocatalytic materials.