Citation: Ruimin Chen, Hong Wang, Huizhong Wu, Jianping Sheng, Jieyuan Li, Wen Cui, Fan Dong. SrTiO₃/BiOI heterostructure: Interfacial charge separation, enhanced photocatalytic activity, and reaction mechanism[J]. Chinese Journal of Catalysis, ;2020, 41(4): 710-718. doi: S1872-2067(19)63472-8 shu

SrTiO₃/BiOI heterostructure: Interfacial charge separation, enhanced photocatalytic activity, and reaction mechanism

Ruimin Chen ^a, ,
Hong Wang ^a ,
Huizhong Wu ^a ,
Jianping Sheng ^b ,
Jieyuan Li ^b,c ,
Wen Cui ^b,d ,
Fan Dong ^a,b

a Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;
b Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China;
c College of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China;
d The Center of New Energy Materials and Technology, School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China

Received Date: 10 September 2019
Revised Date: 12 October 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (21822601, 21501016, 21777011), the National R&

Heterostructured photocatalysts provide an effective way to achieve enhanced photocatalytic performances through efficient charge separation. Although both wide- and narrow-band-gap photocatalysts have been widely investigated, the charge separation and transfer mechanism at the contacting interface of the two has not been fully revealed. Here, a novel SrTiO₃/BiOI (STB) heterostructured photocatalyst was successfully fabricated by using a facile method. The heterostructure in the photocatalyst extends the photoabsorption to the visible light range, and thus, high photocatalytic NO removal performance can be achieved under visible light irradiation. A combination of experimental and theoretical evidences indicated that the photogenerated electrons from the BiOI semiconductor can directly transfer to the SrTiO₃ surface through a preformed electron delivery channel. Enhanced electron transfer was expected between the SrTiO₃ and BiOI surfaces under light irradiation, and leads to efficient ROS generation and thus a high NO conversion rate. Moreover, in situ diffused reflectance infrared Fourier transform spectroscopy revealed that STB can better inhibit the accumulation of the toxic intermediate NO₂ and catalyze the NO oxidation more effectively. This work presents a new insight into the mechanism of the interfacial charge separation in heterostructures and provides a simple strategy to promote the photocatalytic technology for efficient and safe air purification.
- Heterostructure,
- SrTiO₃/BiOI,
- Charge separation,
- Photocatalysis,
- Reaction mechanism
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SrTiO₃/BiOI heterostructure: Interfacial charge separation, enhanced photocatalytic activity, and reaction mechanism