Grafting Molecular Cobalt‐oxo Cubane Catalyst on Polymeric Carbon Nitride for Efficient Photocatalytic Water Oxidation

In this work, we have successfully constructed a cobalt–oxo (Co^III₄O₄) cubane complex on polymeric carbon nitride (PCN) through pyridine linkage. The covalently grafted Co^III₄O₄ cubane units were uniformly distributed on the PCN surface. The product exhibited greatly enhanced photocatalytic activities for water oxidation under visible‐light irradiation. Further characterizations and spectroscopic analyses revealed that the grafted Co^III₄O₄ cubane units could effectively capture the photogenerated holes from excited PCN, lower the overpotential of oxygen evolution reaction (OER), and serve as efficient catalysts to promote the multi‐electron water oxidation process. This work provides new insight into the future development of efficient photocatalysts by grafting molecular catalysts for artificial photosynthesis.