光催化还原二氧化碳是二氧化碳资源化利用的理想途径，体系的催化效率、产物选择性、产物还原程度与体系的设计和催化剂的结构密切相关。近年研究表明，二氧化碳在金属中心的转化是多位点协同过程，但当前报道的绝大多数分子催化体系均为基于单核催化剂的均相体系。本项目提出以廉价金属分子催化剂为基本构筑单元，通过高分子修饰、自组装聚集、纳米材料表面集成等手段构筑基于分子催化剂的“多核超分子二氧化碳还原催化剂”，以期提高分子催化剂的协同催化效应；在此基础上，通过对“多核催化剂”和纳米半导体材料的功能化修饰，将催化剂的“多核协同催化”效应和半导体材料的“多电子激发”特性结合，构筑“多核二氧化碳还原光催化剂”。本项目有望通过将分子催化剂的高选择性、多核结构的协同效应、纳米半导体材料的多电子激发特性集成在“多核催化剂/光催化剂”中，以期提升光催化二氧化碳还原体系的效率、产物选择性及产物还原程度。

The conversion of CO2 into fuels by artificial photosynthesis is an ideal way of resource utilization of carbon dioxide. The catalytic activity, product selectivity, and the reduction degree of CO2 in a certain system highly depend on the system design and the structure of catalyst. Recent research demonstrated that the transformation of CO2 at metal center is a multi-nuclear synergetic catalysis. However, most of the reported molecular catalysts are mononuclear catalyst. Herein, we propose to develop molecular catalyst-based supramolecular “multi-nuclear catalyst and photocatalyst” for photocatalytic CO2 reduction. Three strategies, grafting molecular catalysts onto polymers, self-assembling of molecular catalysts, and loading molecular catalysts onto surface of nano-materials, are proposed to synthesize “multi-nuclear catalysts”. The hybrid “multi-nuclear photocatalysts” are designed by incorporating “multi-nuclear catalyst” and nano-semiconductor into one photocatalyst. The proposed “multi-nuclear catalyst/photocatalyst” highlights the combination of advantages of high selectivity of molecular catalyst, synergetic catalysis of multi-nuclear structure, and multi-electron excitation of nano-semiconductor in one catalyst/photocatalyst. These catalysts and photocatalysts are expected to achieve CO2 reduction with high-activity, high-selectivity, and multi-electron reduction in artificial photosynthetic CO2 reduction systems.