Anion-exchange engineering of cookie-like Bi2S3/Bi2MoO6heterostructure for enhanced photocatalytic activities and gas-sensing properties.
Developing efficient visible-light-driven photocatalysts will advance alternative energy technologies, ultimately curbing the environmental pollution associated with fossil fuels. In this work, Bi2S3/Bi2MoO6photocatalysts with a heterogeneous cookie-like structure were prepared for the first time by in-situ anion exchange at relatively low temperatures. The catalysts exhibited enhanced photocatalytic activity, which we attributed to the photocurrent response, a diminished recombination rate of photogenerated electron-hole pairs, and the existence of a large heterojunction interface. These governing factors were discerned by photoelectrochemical measurements, calculated energy band positions and photoluminescence spectra. Bi2S3/Bi2MoO6nanocomposites also exhibit better performance in response to gas than bare Bi2MoO6according to gas sensing tests. Our work, in relaying a feasible method to synthesize Bi2S3/Bi2MoO6-based heterojunction superstructures, and documents a universal preparation method of synthetic heterogeneous complexes, and provides necessary groundwork for the development of next generation semiconductor photocatalytic technology and gas sensor.
Institute of Special Materials and Technology, Fudan University, Shanghai 200433, PR China.
Yu
Y
Pei
Institute of Special Materials and Technology, Fudan University, Shanghai 200433, PR China.
Xiaoguang
X
Li
Institute of Special Materials and Technology, Fudan University, Shanghai 200433, PR China.
Hang
H
Chu
Institute of Special Materials and Technology, Fudan University, Shanghai 200433, PR China.
Yuancai
Y
Ge
Department of Materials Science and Nano Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA.
Pei
P
Dong
Department of Materials Science and Nano Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA.
Robert
R
Baines
Institute of Special Materials and Technology, Fudan University, Shanghai 200433, PR China.
Liyuan
L
Pei
Institute of Special Materials and Technology, Fudan University, Shanghai 200433, PR China. Electronic address: mxye@fudan.edu.cn.
Mingxin
M
Ye
Institute of Special Materials and Technology, Fudan University, Shanghai 200433, PR China. Electronic address: jfshen@fudan.edu.cn.
Jianfeng
J
Shen
Anion exchange; Bi(2)S(3)/Bi(2)MoO(6) nanocomposite; Gas-sensing; Heterostructures; Photocatalytic degradation