Achieving Efficient Incorporation of π‐Electrons into Graphitic Carbon Nitride for Markedly Improved Hydrogen Generation. Issue 7 (3rd January 2019)

• Record Type: Journal Article
• Authors: Li, Jing; Wu, Dandan; Iocozzia, James; Du, Haiwei; Liu, Xueqin; Yuan, Yupeng; Zhou, Wei; Li, Zhen; Xue, Zhaoming; Lin, Zhiqun
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 7(2019)
• Page Start: 1985
• Page End: 1989
• Publication Date: 2019-01-03
• Subjects: carbon nitride -- microwaves -- photocatalysis -- π-electrons; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201813117
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: A rapid and highly efficient strategy for introducing C into g‐C3 N4 involves copolymerizing π‐electron‐rich barbituric acid with melamine via a facile microwave‐assisted heating, thereby eliminating the issues in conventional electric furnace heating, such as the severe volatilization, owing to the mismatch of the sublimation temperatures of barbituric acid and melamine. The g‐C3 N4 catalyst after optimizing the C‐doping content actively generates increased amounts of H2 under visible light exposure with the highest H2 generation rate of 25.0 μmol h −1, which is nearly 20 times above that using g‐C3 N4 produced by conventional electric furnace heating of two identical monomers (1.3 μmol h −1 ). As such, the microwave‐assisted heating strategy may stand out as an extremely simple route to incorporating π‐electrons into g‐C3 N4 with markedly improved photocatalytic performance. Abstract : π‐Electrons were rapidly and efficiently incorporated into the g‐C3 N4 by copolymerizing π‐electron‐rich barbituric acid with melamine via a microwave‐assisted heating process. The as‐produced g‐C3 N4 shows a near 20‐fold enhancement in H2 generation upon exposure to visible light, representing a rate of 25.0 μmol h −1 over 1.3 μmol h −1 from g‐C3 N4 produced by conventional heating in an electric furnace.