Abstract Photocatalytic carbon dioxide (CO2) reduction to obtain hydrocarbon solar fuels is one of the promising strategies to solve energy crisis and complement carbon cycle. However, the low activity and poor product selectivity greatly limit its practical application. Tuning product selectivity is of great significance to improve the yield of target product and deepen the understanding of CO2 reduction reaction mechanism. In this review, we firstly summarize the widely accepted pathways of photocatalytic CO2 reduction reactions. Secondly, important factors affecting product selectivity are analyzed, mainly including light-excitation attributes, band structure of photocatalysts, separation of photogenerated charge carriers, adsorption/activation of reactants, surface active sites of catalytic reaction, and adsorption/desorption of intermediates. Finally, the challenges and perspectives in developing photocatalysts with high CO2 reduction efficiency and product selectivity are presented.

中文翻译：

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光催化 CO2 还原反应的产物选择性

摘要 光催化二氧化碳（CO2）还原获得碳氢太阳能燃料是解决能源危机和补充碳循环的有前景的策略之一。然而，低活性和产品选择性差极大地限制了其实际应用。调节产物选择性对于提高目标产物的收率和加深对CO2还原反应机理的理解具有重要意义。在这篇综述中，我们首先总结了被广泛接受的光催化 CO2 还原反应途径。其次，分析了影响产物选择性的重要因素，主要包括光激发属性、光催化剂的能带结构、光生载流子的分离、反应物的吸附/活化、催化反应的表面活性位点以及中间体的吸附/解吸。