Figure 1.

Photocatalytic CO₂ reduction. (a) Time courses for photocatalytic CO production by the ternary CODH/AgNCs- PMAA/TiO₂ complex and other combinations, along with various control experiments, under visible light irradiation, followed using GC. In all cases, the 5 mL of water in the vial contained 0.1 M TEOA, 0.1 M NaCl, and 25 mM EDTA at pH 6.0. For experiments with the ternary complex (T), the vial contained 5 mg of AgNCs-PMAA/TiO₂ and 0.50 nmol of CODH. Experiments were carried out at 25 °C (black), 37 °C (red), and 50 °C (blue). Control experiments were carried out using CODH/AgNCs-PMAA (no TiO₂), CODH/TiO₂ (no AgNCs-PMAA) and AgNCs-PMAA/TiO₂ (no CODH). (b) Production of CO over the course of 6 h, in which CO was flushed out at 2 h intervals and CO₂ was restored to the initial level (98%).