Fabrication of novel CoO/porous graphitic carbon nitride S-scheme heterojunction for efficient CO2 photoreduction

The construction of heterojunction plays a key role in solving the charge separation and transfer at the interface of photocatalyst. Herein, a new type of step-scheme (S-scheme) heterojunction was formed by growing cobalt oxide (CoO) in situ on porous graphitic carbon nitride (PCN) to convert CO2 to CO. The porous structure of PCN can increase the absorption of CO2 and act as an active site. The special charge separation of S-scheme heterojunction can give CoO/PCN system with strong redox ability. And S-scheme heterojunction can accelerate charge separation and transfer at the interface. Compared with CoO and PCN, CoO/PCN composites exhibits a higher CO2 reduction rate (40.31 mu mol g(-1)h(-1)), 3.43 and 23.85 times higher than that of CoO (11.73 mu mol g(-1)h(-1)) and PCN (1.69 mu mol g(-1)h(-1)), respectively. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

The formation of S-scheme heterojunction by growing CoO on PCN can enhance CO2 conversion efficiency and redox ability, accelerating charge separation and transfer at the interface for efficient photocatalysis.