CO2 光催化还原技术在减少二氧化碳排放的同时还可提供高附加值可再生能源，对于从缓解气候变暖及能源危机具有重大意义。本项目针对TiO2催化剂效率低、选择性差等不足之处，拟通过浸渍法结合快速火焰还原法合成PtCu合金晶面选择性沉积TiO2催化剂（PtCu/TS），并建立催化剂结构调控方法。定量分析PtCu合金晶面选择性沉积对TiO2能带结构、电荷传递特性以及表面吸附特性的影响，探究PtCu/TS微观结构特征与宏观物理化学特性之间的定量关联机制，并结合CO2光催化还原活性评价与选择性分析，阐明PtCu/TS物理化学特性在CO2选择性还原过程中的协同与竞争机制。精确识别反应过程中催化剂表面中间产物，探明CO2还原反应路径，揭示PtCu/TS光催化还原 CO2反应机理，建立CO2光催化还原选择性调控机制，为高效率、高选择性光催化剂的开发提供新思路与新方法。

CO2 photocatalytic reduction can reduce CO2 emission and provide valuable renewable energy simultaneously, which is of great significance for relieving global warming and energy crisis. Due to the low conversion efficiency and poor selectivity, this project attempts to synthesize PtCu alloy facet-selectively deposited TiO2 catalyst (PtCu/TS) by combining impregnation method and rapid flame reduction method. The effect of facet-selective deposition of PtCu alloy on the band structure, electron transfer and surface adsorption properties of the catalyst will be analyzed quantitatively and the quantitative relationship between the microstructural and macroscopical physicochemical characteristics of PtCu/TS will be investigated. Combing the evaluation of photocatalytic activity and selectivity, the synergy and competition of the physic-chemical properties of PtCu/TS during selective CO2 photocatalytic reduction will be clarified. The reaction intermediates on the surface of the catalyst will be identified accurately and the reaction pathway will be clarified. Then the reaction mechanism will be revealed and a regulatory mechanism for the selectivity of CO2 photocatalytic reduction will be built. The project attempts to provide a new insight into the development of high- activity and high-selectivity catalyst.