摘要： Photocatalytic conversion of diluted CO2 into solar fuel is highly appealing yet still in its infancy. Herein, we demonstrate the metal nodes-dependent performance for photoreduction of diluted CO2 by constructing Ni metal-organic frameworks monolayers (Ni MOLs). In diluted CO2 (10%), Ni MOLs exhibits a highest apparent quantum yield of 1.96% with a spectacular CO selectivity of 96.8%, which not only exceeds reported systems in diluted CO2 but also is superior to most catalysts in pure CO2. Whereas its isostructural Co MOLs is almost inactive in diluted CO2, indicating the performance is dependent on the metal nodes. Experimental and theoretical investigations show that strong CO2 binding affinity of Ni MOLs is the crucial factor, which is beneficial to stabilize the Ni-CO2 adducts and facilitates CO2-to-CO conversion. The universality of the superiority of Ni for CO2 photoreduction can be extended to other Ni MOFs, providing an effective general strategy for the design of inorganic-organic complexes for artificial photosynthesis.