Improvement of CO2 Reduction Photocatalysis of a Ru(II)–Re(I) Complex and Carbon Nitride Hybrid by Coadsorption of an Os(II) Complex Photosensitizer

High Resolution Image Download MS PowerPoint Slide Photocatalytic CO 2 reduction has attracted attention as a prospective technology for addressing global warming and the reduction in fossil fuel resources. Hybrid photocatalysts comprising a visible light-absorbing semiconductor and a supramolecular photocatalyst with photosensitizer and catalyst units in one molecule have been developed for CO 2 reduction. As an example, a hybrid of TiO 2 -loaded polymeric carbon nitride (PCN) and a Ru(II)–Re(I) supramolecular photocatalyst ( RuRe /TiO 2 /PCN) works as a CO 2 reduction photocatalyst in the presence of triethanolamine (TEOA) to give CO with a high selectivity. However, its durability is low, and the maximum turnover number of CO formations (TON CO ) is less than 100. In this study, a system was constructed with coadsorption of an Os(II)-complex photosensitizer ( OsP ) on the surface of RuRe /TiO 2 /PCN to improve the low durability of the hybrid photocatalyst by promoting a more rapid electron supply to the Re catalyst unit of RuRe . The coadsorption of OsP increased the TON CO of RuRe /TiO 2 /PCN to 239.