All-inorganic TiO2/Cs2AgBiBr6 composite as highly efficient photocatalyst under visible light irradiation
Jianzhong Ma1,3,4(), Lu Wen1,4, Qianqian Fan1,3,4, Siying Wei2,4, Xueyun Hu1,4, Fan Yang4,5
1. College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China 2. College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China 3. Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry (Ministry of Education), Shaanxi University of Science and Technology, Xi’an 710021, China 4. Xi’an Key Laboratory of Green Chemicals and Functional Materials, Shaanxi University of Science and Technology, Xi’an 710021, China 5. College of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO2 in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs2AgBiBr6 double halide perovskite nanocrystals, owing to its strong visible light absorption and tunable band gap. In this work, this photocatalytic process was facilitated by a unique TiO2/Cs2AgBiBr6 composite, which was identified as an S-cheme heterojunction. TiO2/Cs2AgBiBr6 composite was investigated for its structure and photocatalytic behavior. The results showed that when the perovskite dosage is 40%, the photocatalytic rate of TiO2 could be boosted to 0.1369 min–1. This paper discusses and proposes the band gap matching, carrier separation, and photocatalytic mechanism of TiO2/Cs2AgBiBr6 composites, which will facilitate the generation of new ideas for improving TiO2’s photocatalytic performance.
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