S‑scheme heterojunction of thin-layer O-modified graphitic carbon nitride/cobalt porphyrin to promote photocatalytic CO2 conversion

Zeen Zheng; Qian Zheng; Binnan Qiao; Hangmin Xu; Kang Zhong; Jinman Yang; Minqiang He; Yanhua Song; Xingwang Zhu

doi:10.1016/j.jcis.2024.04.067

S‑scheme heterojunction of thin-layer O-modified graphitic carbon nitride/cobalt porphyrin to promote photocatalytic CO₂ conversion

J Colloid Interface Sci. 2024 Aug:667:713-722. doi: 10.1016/j.jcis.2024.04.067. Epub 2024 Apr 11.

Authors

Zeen Zheng¹, Qian Zheng², Binnan Qiao², Hangmin Xu³, Kang Zhong⁴, Jinman Yang⁴, Minqiang He⁴, Yanhua Song⁵, Xingwang Zhu⁶

Affiliations

¹ School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China; College of Environmental Science and Engineering, Institute of Technology for Carbon Neutralization, Yangzhou University, Yangzhou 225009, PR China.
² School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China.
³ College of Environmental Science and Engineering, Institute of Technology for Carbon Neutralization, Yangzhou University, Yangzhou 225009, PR China.
⁴ School of the Environment and Safety Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang 212013, PR China.
⁵ School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China. Electronic address: songyh@just.edu.cn.
⁶ College of Environmental Science and Engineering, Institute of Technology for Carbon Neutralization, Yangzhou University, Yangzhou 225009, PR China. Electronic address: zxw@yzu.edu.cn.

PMID: 38670014
DOI: 10.1016/j.jcis.2024.04.067

Abstract

The emissions of CO₂ are increasing year by year, which have led to serious environmental problems. Converting CO₂ into valuable fuels through photocatalysis is a promising strategy. In this research, oxygen atoms were successfully innovated into graphitic carbon nitride (CN). Additionally, cobalt porphyrin (CoTPP) was successfully loaded onto the modified carbon nitride (Co/CN). The generation of interfacial electric fields and bending bands between CN and CoTPP was demonstrated experimentally. The electrons in the CN and the holes in the CoTPP were combined to form a unique S-scheme heterojunction structure, and efficient separation of carriers was promoted. As a result, the CO conversion under visible light irradiation reached an impressive 100.70 μmol g^-1 h^-1. By integrating theoretical and experimental findings, this study underscores the critical role of catalyst design in enabling efficient photocatalytic CO₂ reduction.

Keywords: Cobalt porphyrin; Electron transport efficiency; O-modified graphitic carbon nitride; Photocatalytic CO(2) reduction; S-scheme.