开发高性能半导体光催化材料体系是光催化CO2还原制太阳燃料领域的关键科学问题。针对现有TiO2光催化材料活性低与选择性差的缺陷，本项目提出，针对CO2向CH4,CH3OH等高品质燃料的光催化转化，在空心光催化材料诸多结构优势的基础上，开拓原位表面结构与化学剪裁策略，从优化“吸附中心”与"催化活性中心"两大光催化功能模块着手，改善光催化CO2还原活性与选择性，构筑先进TiO2基太阳燃料光催化材料。揭示TiO2空心结构合成控制与表面剪裁一体化设计制备的关键参数与控制规律。深入研究主客体表面结构与化学特征的光催化协同效应，建立表面结构与化学影响光催化 CO2 还原活性与选择性的关系模型与内在机制。该项目旨在革新先进TiO2基光催化材料的的设计制备方法，开发新型高活性高选择性主客体复合光催化材料体系，丰富人工光合成的理论知识。

The advance in highly active and selective photocatalysts is a key scientific challenge in producing solar fuels from photocatalytic reduction of carbon dioxide (CO2). In order to overcome the drawbacks of currently available TiO2-based photocatalysts in terms of low photocatalytic activity and inferior photocatalytic selectivity, this project aims to construct advanced TiO2-based photocatalysts with improved activity and selectivity towards photocatalytic reduction of CO2 to solar fuels, especially methane (CH4) and methanol (CH3OH), via in-situ surface tailoring of hollow TiO2 photocatalyst with a variety of structural advantages, which contribute to the synergetic optimization of "adsorption centers" and " catalytically active centers". The key parameters and controlling law in dominating the surface structure and chemistry of TiO2-based hollow photocatalysts will be clarified. Moreover, synergetic effects of surface host-guest structures and chemistry in affecting photocatalytic CO2 reduction performances will be thoroughly investigated, and the relationship between surface structures and chemistry of as-prepared TiO2-based nanocomposites and their photocatalytic activity and selectivity in targeted photocatalytic reduction of CO2 and the corresponding underlying mechanisms will be disclosed. The outcomes of this project will innovate advanced technology for design and synthesis of TiO2-based composite nanomaterials, will advance highly active and selective host-guest composite photocatalyst systems, will enrich the basic knowledge of artificial photosynthesis.