Preparation of CdS-P25/ZIF-67 composite material and its photocatalytic CO2 reduction performance

Commercial TiO 2 (P25) is a potentially promising catalyst for photocatalytic CO 2 reduction. Nonetheless, the inefficient light capture ability and egregious charge recombination restrict its further utilization. In this work, CdS and P25 are incorporated to form the composite CdS-P25, which is further immobilized on the surface of a copper-based organic metal framework (MOF), ZIF-67, so as to establish a ternary hybrid CdS-P25/ZIF-67 via a facile hydrothermal method. On the basis of the enhancement in light absorption resulted from the formation of CdS-P25, the incorporation of ZIF-67 further prolongs the light absorption edge of CdS-P25/ZIF-67, up to 552 nm. In addition, the introduction of ZIF-67 with the dual Z-Scheme system constructed could significantly suppress the charge recombination, as revealed by the transient photocurrent value of CdS-P25/ZIF-67, which is 3.47 μA cm −2 , about 20.4 times than that of CdS-P25. Accordingly, the photocatalytic assessment of CdS-P25/ZIF-67 also presents a significantly amelioration in CO 2 reduction reaction (CO 2 RR) in comparison with either CdS-P25 or ZIF-67, giving 1.58 μmol h −1 CH 4 and 1.49 μmol h −1 CO production. Our work sheds light on the investigation of efficacious construction of P25 based hybrids for light-driven photocatalysis.