title: Non-covalent doping of graphitic carbon nitride with ultrathin graphene oxide and molybdenum disulfide nanosheets: an effective binary heterojunction photocatalyst under visible light irradiation.
abstract: A proof of concept integrating binary p-n heterojunctions into a semiconductor hybrid photocatalyst is demonstrated by non-covalent doping of graphite-like carbon nitride (g-C3N4) with ultrathin GO and MoS2 nanosheets using a facile sonochemical method. In this unique ternary hybrid, the layered MoS2 and GO nanosheets with a large surface area enhance light absorption to generate more photoelectrons. On account of the coupling between MoS2 and GO with g-C3N4, the ternary hybrid possesses binary p-n heterojunctions at the g-C3N4/MoS2 and g-C3N4/GO interfaces. The space charge layers created by the p-n heterojunctions not only enhance photogeneration, but also promote charge separation and transfer of electron-hole pairs. In addition, the ultrathin MoS2 and GO with high mobility act as electron mediators to facilitate separation of photogenerated electron-hole pairs at each p-n heterojunction. As a result, the ternary hybrid photocatalyst exhibits improved photoelectrochemical and photocatalytic activity under visible light irradiation compared to other reference materials. The results provide new insights into the large-scale production of semiconductor photocatalysts.
authors: Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, Faculty of Materials and Optoelectronic Physics, Xiangtan University, Hunan 411105, China.
authors: S W
authors: SW
authors: Hu
authors: Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, Faculty of Materials and Optoelectronic Physics, Xiangtan University, Hunan 411105, China; Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong. Electronic address: ylwxtu@xtu.edu.cn.
authors: L W
authors: LW
authors: Yang
authors: Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, Faculty of Materials and Optoelectronic Physics, Xiangtan University, Hunan 411105, China.
authors: Y
authors: Y
authors: Tian
authors: Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, Faculty of Materials and Optoelectronic Physics, Xiangtan University, Hunan 411105, China.
authors: X L
authors: XL
authors: Wei
authors: Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, Faculty of Materials and Optoelectronic Physics, Xiangtan University, Hunan 411105, China.
authors: J W
authors: JW
authors: Ding
authors: Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, Faculty of Materials and Optoelectronic Physics, Xiangtan University, Hunan 411105, China.
authors: J X
authors: JX
authors: Zhong
authors: Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
authors: Paul K
authors: PK
authors: Chu
keywords: Graphite-like carbon nitride; Heterojunction; Nanosheets; Non-covalent doping; Photocatalysis