Constructing built-in electric field in graphitic carbon nitride hollow nanospheres by co-doping and modified in-situ Ni2P for broad spectrum photocatalytic activity. (10th November 2021)

• Record Type: Journal Article
• Authors: Zhang, Linlin; Peng, Wenxing; Li, YaKun; Qin, Rui; Yue, Dong; Ge, Chengjun; Liao, Jianjun
• Is Part Of: Journal of materials science & technology. Volume 90(2022)
• Page Start: 143
• Page End: 149
• Publication Date: 2021-11-10
• Subjects: Photocatalysis -- Ni2P -- g-C3N4 -- Hollow nanospheres -- Pt-free cocatalysts; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2021.03.019
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract : S and O co-doped g-C3 N4 hollow-nanospheres modified in-situ by Ni2 P is obtained. Ni2 P/SOHC3 N4 acts as an effective photocatalyst for stable photocatalytic property. Ni2 P traps the electrons from co-doped g-C3 N4 for boosting charge separation. Hollow structure for g-C3 N4 generates more active sites for photocatalytic reaction. Abstract: The construction of built-in electric field is generally considered as an effective strategy to enhance photocatalytic performance due to its significant role in charge separation. Herein, a built-in electric field within g-C3 N4 hollow nanospheres co-doped with sulfur and oxygen and modified in-situ Ni2 P is proposed. Ni2 P/SOHC3 N4 exhibits significantly enhanced board spectrum photocatalytic properties for hydrogen precipitation (5.21 mmol h −1 g −1 ) and photocatalytic Cr(VI) reduction without the use of noble metal. It also achieves high photocatalytic sterilization activity and remarkable stability when used to completely inactivate E. coli (10 7 ) in 60 min under Vis-NIR light irradiation. The enhanced performance is attributed to the formation of a curved hollow sphere structure, which promotes the electron transfer between the inner and outer layers. In addition, co-doping inhibits the recombination of photogenerated carriers, and the built-in electric field recombined with Ni2 P facilitates the electron transfer between the composite interfaces. This design strategy demonstrates an original method of devising multifunctional photocatalysts with enhanced activity and stability. Graphical abstract: Image, graphical abstract