Fig. 7: Schematic mechanism of the photocatalytic CO2 reduction by IHEP-28.
From: Nickel Ion Induced Multistage Assembly of Th13 Cluster

The CO2 molecules absorbed on the IHEP-28 surface were reduced into CO undergo a two-electron process under visible light irradiation. Color scheme: Th, green; Ni, cyan; C, gray; O, red; S, yellow; H, dark green; Ru, pink.