Lead-free perovskite Cs2XCl6 (X = Hf, Zr, Te) microcrystals for photocatalytic CO2 reduction

• Published in: Materials today energy Vol. 28; p. 101067
• Main Authors: Tian, Changqing, Huang, Qiang, Wu, Daofu, Lai, Junan, Qi, Fei, Zhang, Nan, Zhang, Wenxia, Tang, Xiaosheng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2022
• Subjects: CO2 reduction; Cs2XCl6; Double perovskite; Lead-free; Photocatalytic; Double perovskite; Photocatalytic; CO2 reduction; Lead-free; Cs2XCl6
• ISSN: 2468-6069; 2468-6069
• DOI: 10.1016/j.mtener.2022.101067

The lead halide perovskites have broad application prospects in the fields of optoelectronics and photocatalysis. However, their toxicity and limited stability are the main obstacles restricting their large-scale photocatalytic applications. In order to solve these problems, a set of lead-free stable Cs2XCl6 (X = Hf, Zr, Te) perovskite microcrystals were synthesized via a solvothermal solution. For the first time, the Cs2XCl6 (X = Hf, Zr, Te) perovskite microcrystals were employed as efficient photocatalysts for the conversion of CO2 into CO and CH4. Among them, the Cs2TeCl6 microcrystals showed the best photocatalytic performance under light irradiation for 3 h, while the yields of CO and CH4 were 284.4 μmol/g and 48.96 μmol/g respectively. Our strategy may provide a new idea for the CO2 photoreduction based on lead-free halide perovskites. [Display omitted] •Lead-free Cs2XCl6 (X = Hf, Zr, Te) perovskites were first applied to CO2 photocatalytic field.•The Cs2XCl6 (X = Hf, Zr, Te) perovskites exhibited excellent stability under continuous illumination, constant heating, and air conditions.•The Cs2TeCl6 microcrystals showed the best photocatalytic performance.