Band Engineering and Morphology Control of Oxygen-Incorporated Graphitic Carbon Nitride Porous Nanosheets for Highly Efficient Photocatalytic Hydrogen Evolution
Yunyan Wu, Pan Xiong, Jianchun Wu, Zengliang Huang, Jingwen Sun, Qinqin Liu, Xiaonong Cheng, Juan Yang, Junwu Zhu, Yazhou Zhou
Abstract
Abstract Graphitic carbon nitride (g-C 3 N 4 )-based photocatalysts have shown great potential in the splitting of water. However, the intrinsic drawbacks of g-C 3 N 4 , such as low surface area, poor diffusion, and charge separation efficiency, remain as the bottleneck to achieve highly efficient hydrogen evolution. Here, a hollow oxygen-incorporated g-C 3 N 4 nanosheet (OCN) with an improved surface area of 148.5 m 2 g −1 is fabricated by the multiple thermal treatments under the N 2 /O 2 atmosphere, wherein the C–O bonds are formed through two ways of physical adsorption and doping. The physical characterization and theoretical calculation indicate that the O-adsorption can promote the generation of defects, leading to the formation of hollow morphology, while the O-doping results in reduced band gap of g-C 3 N 4 . The optimized OCN shows an excellent photocatalytic hydrogen evolution activity of 3519.6 μmol g −1 h −1 for ~ 20 h, which is over four times higher than that of g-C 3 N 4 (850.1 μmol g −1 h −1 ) and outperforms most of the reported g-C 3 N 4 catalysts.