Nitrogen vacancy-rich porous carbon nitride nanosheets for efficient photocatalytic H2O2 production. (March 2022)

• Record Type: Journal Article
• Authors: Zhao, Chen; Shi, Chunjing; Li, Qi; Wang, Xinyao; Zeng, Guang; Ye, Sheng; Jiang, Baojiang; Liu, Jian
• Is Part Of: Materials today energy. Volume 24(2022)
• Publication Date: 2022-03
• Subjects: Carbon nitride -- Nanosheet -- N vacancy -- Photocatalysis -- H2O2 production; Energy development -- Periodicals; Energy industries -- Periodicals; Power resources -- Periodicals; Energy policy -- Periodicals; Energy development; Energy industries; Energy policy; Power resources; Electronic journals; Periodicals; 621.042
• DOI: 10.1016/j.mtener.2021.100926
• Languages: English
• ISSNs: 2468-6069

Abstract

Abstract: Photocatalytic production of H2 O2 has attracted widespread attention as an environmental-friendly approach. However, the low activity and selectivity of photocatalytic H2 O2 are still unsatisfactory. In this work, we connected the triblock copolymer, melamine, and melinic acid by hydrogen bonding through supramolecular self-assembly. The triblock copolymer was removed, along with the nitrogen attached to it by high-temperature calcination, so that porous carbon nitride nanosheets (Nv-CNN) with nitrogen vacancies were prepared. It was found that the presence of N vacancies promoted the separation of electron-hole pairs and the adsorption of O2 . The optimal photocatalytic H2 O2 production rate of Nv–CNN–3 could reach 1768 μmol h −1 g −1, which was 44.6 times higher than bulk C3 N4 (39.6 μmol h −1 g −1 ). This work might shed light on an in-depth understanding of the role of vacancy in photocatalytic H2 O2 production. Graphical abstract: Image 1 Highlights: Porous carbon nitride nanosheet with nitrogen vacancies. N vacancies can be controlled by adjusting the calcination time. Enhanced O2 adsorption and promoted charge separation. The photocatalytic H2 O2 production rate of Nv–CNN–3 is 44.6 times than that of graphitic carbon nitride.