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Abstract Heterojunction engineering, especially 2D/2D heterojunctions, is regarded as a quite promising strategy to manipulate the photocatalytic performance of semiconductor catalysts. In this manuscript, a direct Z‐scheme 2D/2D heterojunction of CsPbBr 3 /Bi 2 WO 6 is designed and fabricated by a simple electrostatic self‐assembly process. By using ultrathin nanosheets with several atomic layers as the building blocks, a close CsPbBr 3 /Bi 2 WO 6 heterointerface over large area with quite a short charge transport distance is obtained, which enables a valid Z‐scheme interfacial charge transfer between Bi 2 WO 6 and CsPbBr 3 and thus boosts charge separation. The CsPbBr 3 /Bi 2 WO 6 heterojunction exhibits a superior photocatalytic performance toward CO 2 reduction. By incorporating Pt nanoparticles as the cocatalyst, a high photoelectron consumption rate of 324.0 µmol g −1 h −1 under AM 1.5G irradiation (150 mW cm −2 ) is obtained, which is 12.2 fold higher than that of CsPbBr 3 nanosheets. Moreover, a stable product yield of up to 1582.0 µ mol g −1 and electron consumption yield of 8603.0 µ mol g −1 for photocatalytic CO 2 reduction to CO (11.4%) and CH 4 (84.3%) can be achieved after 30 h of continuous catalytic reaction. The accelerated photogenerated charge transfer and spatial charge separation are investigated in detail by ultrafast spectra, photoelectrochemical test, and Kelvin probe force microscopy.
Jiang et al. (Fri,) studied this question.