Shearing bridge bonds in carbon nitride vesicles with enhanced hot carrier utilization for photocatalytic hydrogen production

• Published in: Catalysis science & technology 2022-07, Vol.12 (13), p.4193-42
• Main Authors: Liu, Ping, Li, Shisen, Zhang, Lingling, Yin, Xingliang, Ma, Yongchao
• Format: Article
• Language: English
• Subjects: Carbon; Carbon nitride; Carrier recombination; Catalytic activity; Electromagnetic absorption; Hydrogen production; Melamine; Photocatalysis; Precursors; Reforming; Separation; Shearing; Vesicles; X ray photoelectron spectroscopy
• ISSN: 2044-4753; 2044-4761
• DOI: 10.1039/d2cy00474g

Although carbon nitride (g-C 3 N 4 ) is a common photoconversion material, its photocatalytic activity is constrained by fast carrier recombination and weak light absorption. Here, a precursor reforming strategy is developed to construct melamine precursor rods with an etched surface. After being calcinated, the morphology of the melamine precursor is transformed to interconnected vesicles with open characteristics. In addition, XPS analysis and DFT calculations demonstrate the formation of oxygen-containing groups in the open vesicles, thereby boosting charge separation for surface photocatalytic H 2 production. Such a synergistic regulation strategy produces superior visible-light photocatalytic activity (608.3 mol h −1 g −1 ), and the H 2 production rate is 4.43-times higher than that of bulk g-C 3 N 4 . These findings suggest an accessible way to construct effective photocatalysts via a precursor reforming strategy that can efficiently boost carrier production and spatial separation. The synergistic effect of morphology tailoring and the formation of oxygen-containing groups in g-C 3 N 4 enhanced the production and separation of photoinduced carriers for photocatalytic H 2 production.