The article discusses the challenges in photocatalytic carbon dioxide reduction, focusing on reaction pathways, product selectivity, charge transfer mechanisms, and overestimation of product yield. It highlights the need for a deeper understanding of the photocatalytic process, including the thermodynamics and kinetics of CO₂ reduction, the role of charge transfer, and the impact of sacrificial agents and catalyst decomposition. The study emphasizes the importance of accurate product yield assessment and the development of new testing standards to ensure reliable results. It also discusses the significance of advanced characterization techniques and theoretical calculations in elucidating the mechanisms of CO₂ reduction. The article calls for the development of efficient and scalable photocatalytic systems, as well as the integration of new materials and structures to enhance performance. Overall, the review underscores the need for continued research and innovation in photocatalytic CO₂ reduction to address the global energy and environmental challenges.The article discusses the challenges in photocatalytic carbon dioxide reduction, focusing on reaction pathways, product selectivity, charge transfer mechanisms, and overestimation of product yield. It highlights the need for a deeper understanding of the photocatalytic process, including the thermodynamics and kinetics of CO₂ reduction, the role of charge transfer, and the impact of sacrificial agents and catalyst decomposition. The study emphasizes the importance of accurate product yield assessment and the development of new testing standards to ensure reliable results. It also discusses the significance of advanced characterization techniques and theoretical calculations in elucidating the mechanisms of CO₂ reduction. The article calls for the development of efficient and scalable photocatalytic systems, as well as the integration of new materials and structures to enhance performance. Overall, the review underscores the need for continued research and innovation in photocatalytic CO₂ reduction to address the global energy and environmental challenges.