Recent Advances in g-C3N4 Composites Within Four Types of Heterojunctions for Photocatalytic CO2 Reduction

Studies of photocatalytic conversion of CO2 into hydrocarbon fuels, as a promising solution to alleviate global warming and energy issues, are booming in recent years. Researchers have focused interest on developing g-C3N4 composite photocatalysts with intriguing features of robust light harvesting, excellent catalysis, and stable performance. Four types of heterojunctions (type-II, Z-scheme, S-scheme and Schottky) of the g-C3N4 composites are widely adopted. This review aims at presenting and comparing the photocatalytic mechanisms, characteristics, and performances of the g-C3N4 composites concerning these four types of heterojunctions. Besides, perspectives and undergoing efforts for further development of g-C3N4 composite photocatalysts are discussed. This review would be helpful for researchers to get a comprehensive understanding of the progresses and future development trends of g-C3N4 composite heterojunctions for photocatalytic CO2 reduction.