基于h-BCN纳米片负载过渡金属单原子的合成及光催化性能研究

能源短缺和环境污染严重制约社会的和谐发展，光催化技术能够利用太阳能合成清洁能源和降解污染物，有望解决上述问题。h-BCN的电子能带结构和表面性质独特，是一种极具潜力的光催化剂。然而，h-BCN纳米片激子结合能高、表面活性位点缺乏，限制其光催化反应量子效率和稳定性的提高。本项目拟采用过渡金属单原子作为h-BCN纳米片的助催化剂，构建基于h-BCN纳米片负载过渡金属单原子的复合光催化剂。通过微观形貌和精细结构的调控，研究各个合成因素对过渡金属单原子在h-BCN纳米片上的分散度和稳定性的影响。结合光电性能、光催化反应活性及理论计算的研究，揭示过渡金属单原子对h-BCN纳米片中光生激子解离、电荷定向迁移以及表面反应动力学等的影响，阐明光催化反应的作用机制，从而获得高量子效率和高稳定性的h-BCN基光催化剂。本项目的研究将丰富光催化材料内容，为合成高效、稳定的光催化剂提供理论和实验支撑。

The harmonious development of society is seriously limited by energy shortages and environmental pollution. Photocatalytic technology can use solar energy to synthesize clean energy and degrade pollutants, which is expected to solve the above problems. With unique electronic band structure and surface feature, h-BCN becomes a promising photocatalyst. However, h-BCN nanosheets are affected by the disadvantages of high exciton binding energy and unavailable surface active sites, which limit both the quantum yield and stability of the photocatalytic reaction. This project intends to use transitional metal single-atom (TMSA) as cocatalyst for h-BCN nanosheets to prepare the composite photocatalyst of h-BCN nanosheets loaded with TMSA. Through the control of the microscopic morphology and fine structure, the regulation of various synthetic factors of TMSA on h-BCN nanosheets will be investigated. On this basis, combining the researches of photoelectric properties, photocatalytic reaction performance and theoretical calculation, the effect of TMSA for h-BCN nanosheets will be explored, including the migration of excitons, the seperation of carriers, and surface reaction dynamics. As a result, it is able to illustrate the photocatalytic reaction mechanism and obtain the h-BCN based photocatalyst with high quantum efficiency and stability. This project will enrich the research contents of photocatalysts and provide theoretical guidance and experimental basis for synthesizing other efficient and stable photocatalysts.