磷烯/全无机铅卤钙钛矿纳米晶异质结构的构筑及其光催化还原CO2性能研究

开发用于CO2转化的新型高效可见光催化剂一直是光催化领域的主要研究方向和研究热点。本项目拟从设计开发新型纳米光催化体系及其高效光催化还原CO2性能为出发点，致力于设计开发一种基于磷烯/全无机铅卤钙钛矿（LHP）纳米晶异质结结构构建的新型纳米光催化体系，尝试通过对LHP纳米晶结构（比如：CsPbX3）的合理设计与调控以及X型配体表面钝化处理而获得结构稳定的LHP纳米晶，再通过液相反应过程（比如：溶剂热或低温重结晶法）实现LHP纳米晶与磷烯纳米片的有效结合而形成异质结结构，实现高效稳定的光催化还原CO2过程；借助多种实验手段探究相应的磷烯/LHP纳米晶异质结结构和光催化还原CO2性质，探讨磷烯对LHP纳米晶光生电荷产生、传输和复合过程的影响；在此基础上，尝试揭示不同异质结结构光生电荷行为与光催化还原CO2活性之间的内在关联，探讨其光催化还原CO2反应机理，促进其在光催化还原CO2领域中的应用。

The development of new high-efficiency visible light photocatalysts for CO2 conversion has always been the main research direction and research focus in the field of photocatalysis. This project aims at the design and development of a novel photocatalytic nanoarchitecture, which is based on the heterostructure of phosphorene/inorganic lead halide perovskite (LHP) nanocrystals, for high-efficiency photocatalytic reduction of CO2 performance. Stable LHP nanocrystals are firstly obtained through the rational design and modulation of the LHP structure as well as surface passivation by X-type ligands. The phosphorene/LHP nanocrystals-based heterostructures are then fabricated by effectively combining LHP nanocrystals with phosphorene nanosheets in a liquid phase reaction (e.g., solvothermal or low temperature recrystallization process), thus to achieve high efficiency and stable photocatalytic reduction of CO2. With the help of various experimental techniques, the corresponding morphological structures and photocatalytic CO2 reduction properties of the prepared phosphorene/LHP nanocrystals-based heterostructures are investigated, and the influence of phosphorene nanosheets on the production, migration and recombination of photogenerated carries of LHP nanocrystals is also explored. On the basis of these measurements, the intrinsic relationship between the the photogenerated charge behaviors and the photocatalytic activities for CO2 reduction is revealed, and the photocatalytic mechanism for CO2 reduction will be tentatively elucidated. Thus, the achievements in this project are expected to promote promising applications of the phosphorene/LHP nanocrystals-based heterostructures in the field of photocatalytic CO2 reduction.