All-inorganic TiO₂/Cs₂AgBiBr₆ composite as highly efficient photocatalyst under visible light irradiation

Abstract

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.

Graphical abstract

Keywords

Cs₂AgBiBr₆ nanocrystals / visible-light photocatalyst / Cs₂AgBiBr₆/TiO₂ heterojunction

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Competing interests

The authors declare that they have no competing interests.

Acknowledgements

The authors acknowledge the financial support from National Natural Science Foundation of China (Grant Nos. 52073164, 52103088), and Innovation Capability Support Program of Shaanxi (Program No. 2021TD-16).

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