CsPbBr3 perovskite based tandem device for CO2 photoreduction

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 443; p. 136447
• Main Authors: Wang, Jize, Li, Han, Gao, Peng, Peng, Yong, Cao, Shaowen, Antonietti, Markus
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2022
• Subjects: Charge transfer; CO2 photoreduction device; CsPbBr3 perovskite materials; Tandem structure; CsPbBr3 perovskite materials; Tandem structure; CO2 photoreduction device; Charge transfer
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2022.136447

The efficient CO2 photoreduction device with internal electric field is realized by introducing a layer tandem structure made up of g-C3N4 and an inorganic lead-perovskite (CsPbBr3). The device satisfies full artificial photosynthesis of CO2 conversion and exhibits good stability. [Display omitted] •The efficient CO2 photoreduction device is constructed based on CsPbBr3 perovskite.•Tandem structure of CsPbBr3/g-C3N4 promotes directional charge-carrier migration.•The photo-CO yield rate is 238.7 μmol m-2 h−1 under a humid gaseous CO2 system. The design of efficient photocatalytic devices is of great significance to achieve low-cost carbon dioxide reduction into solar fuels. Herein, directional charge-carrier migration is realized by introducing a CO2 reduction device with a tandem structure made up of g-C3N4 and an inorganic lead-perovskite (CsPbBr3). This photocatalytic device shows a significantly increased CO2 photoreduction rate in a humid gaseous CO2 system when compared to the parental g-C3N4 layer. This “full artificial photosynthesis” thereby generates fuel molecules and oxygen from water and CO2, only, without any co-catalysts or sacrificial agents. To our surprise, the device maintains greater than 90% of the CO production yield after 5 days continuous irradiation. The existence of internal electric field is confirmed, which drive the directional movement of photogenerated charge-carriers with the perovskite being reductive, while the carbon nitride with its enormous oxidation stability is covering the oxidation processes. This represents a promising possibility for the practical application of CO2 photoreduction with scalable devices.