Organosilica-assisted superhydrophilic oxygen doped graphitic carbon nitride for improved photocatalytic H2 evolution. (22nd September 2022)

• Record Type: Journal Article
• Authors: Yang, Xiaohang; Bian, Xingbo; Yu, Weilun; Wang, Qiyao; Huo, Xuyang; Teng, Shiyong
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 81(2022)
• Page Start: 34444
• Page End: 34454
• Publication Date: 2022-09-22
• Subjects: Graphitic carbon nitride -- Organosilica assisted method -- Oxygen-containing groups grafting -- Oxygen doping -- Photocatalytic H2 evolution; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.08.026
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The regulation of surface wettability and heteroelement doping have been proved to be effective strategies to enhance photocatalytic H2 evolution activity of graphitic carbon nitride (CN) based photocatalysts. Herein, we report, for the first time, an organosilica assisted method was adopted to synthesize the superhydrophilic oxygen doped graphitic carbon nitride ( O –CN). The presence of organosilica induced simultaneous oxygen-containing groups grafting and oxygen doping within carbon nitride substrate. The grafted oxygen-containing groups improved the surface hydrophilicity and water adsorption. Oxygen doping tailored electronic structure and localized electron distribution, contributing to extended visible light harvesting and elevated photoelectric conversion efficiency. As a result, the H2 generation rate of O –CN photocatalyst was 5.4 times higher than that of pristine CN photocatalyst attributed to the formation of hydrophilic groups and the oxygen doping. Highlights: Superhydrophilic oxygen doped graphitic carbon nitride ( O –CN) was synthesized by a novel organosilica assisted strategy. The organosilica strategy induced abundant oxygen-containing group grafting and enhanced surface wettability. The presence of organosilica led to oxygen doping, which caused narrowed band gap and impurity energy level formation. The O –CN photocatalyst exhibits a 5.4 fold increase in the H2 evolution rate tha that of pristine CN photocatalyst.