biostudies-literatureLi BHainan Provincial Natural Science Foundation of ChinaHainan University Start-up fund11106https://www.ebi.ac.uk/biostudies/studies/S-EPMC10342104biostudies-literatureUnknown24(13)<i>fac</i>-Re(2,2'-bipyridine)(CO)₃Cl] (denoted as ReCC) is an efficient molecule-catalyst with high selectivity in the photoreduction of CO₂ to CO in a homogeneous system. However, the two major drawbacks of Re(I) complexes in the homogeneous system, easy degradation and difficult separation, seriously hinder its development in the field of industrial applications. In this paper, we designed and prepared two different Re-complex fixation systems (denoted as ReCC@TiO₂-5 wt% and ReCC-TiO₂-5 wt%) based on TiO₂ gel via the sensitization method and sol-gel method, respectively. Compared with a pure ReCC complex, both of them exhibited excellent photocatalytic reduction activity. In particular, the sol-gel hybrid system (ReCC-TiO<sub>2</subInternational journal of molecular sciencesThe Facile Synthesis of a Re-Complex Heterogeneous Catalysis System for Enhancing CO₂ Photoreduction Activity.PMC10342104220RC460KYQD(ZR)1955Liang SLi HZhong XChen YLi BCheng JSong YfalseThe Facile Synthesis of a Re-Complex Heterogeneous Catalysis System for Enhancing CO₂ Photoreduction Activity.<i>fac</i>-Re(2,2'-bipyridine)(CO)₃Cl] (denoted as ReCC) is an efficient molecule-catalyst with high selectivity in the photoreduction of CO₂ to CO in a homogeneous system. However, the two major drawbacks of Re(I) complexes in the homogeneous system, easy degradation and difficult separation, seriously hinder its development in the field of industrial applications. In this paper, we designed and prepared two different Re-complex fixation systems (denoted as ReCC@TiO₂-5 wt% and ReCC-TiO₂-5 wt%) based on TiO₂ gel via the sensitization method and sol-gel method, respectively. Compared with a pure ReCC complex, both of them exhibited excellent photocatalytic reduction activity. In particular, the sol-gel hybrid system (ReCC-TiO<sub>2</sub2023-01-01T00:00:00Z2023 Jul2025-04-19T15:58:29.409Z2025-04-19T15:58:29.409ZS-EPMC103421043744628310.3390/ijms241311106