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

Jianzhong Ma; Lu Wen; Qianqian Fan; Siying Wei; Xueyun Hu; Fan Yang

doi:10.1007/s11705-023-2344-6

Front. Chem. Sci. Eng. ›› 2023, Vol. 17 ›› Issue (12) : 1925 -1936. DOI: 10.1007/s11705-023-2344-6

RESEARCH ARTICLE

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

Jianzhong Ma ¹^,³^,⁴^,^†
, Lu Wen ¹^,⁴
, Qianqian Fan ¹^,³^,⁴
, Siying Wei ²^,⁴
, Xueyun Hu ¹^,⁴
, Fan Yang ⁴^,⁵

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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.

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Keywords

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

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Jianzhong Ma, Lu Wen, Qianqian Fan, Siying Wei, Xueyun Hu, Fan Yang. All-inorganic TiO₂/Cs₂AgBiBr₆ composite as highly efficient photocatalyst under visible light irradiation. Front. Chem. Sci. Eng., 2023, 17(12): 1925-1936 DOI:10.1007/s11705-023-2344-6