Fabricating a cost-effective yet highly active photocatalyst to reduce CO₂ to CO and oxidize benzyl alcohol to benzaldehyde simultaneously, is challenging. Herein, we construct an S-scheme 0D/2D CsPbBr₃/TiO₂ heterostructure for bifunctional photocatalysis. An in-situ synthetic route is used, which enables the precise integration between CsPbBr₃ nanocrystals and ultrathin TiO₂ nanosheets exposed with (0 0 1) facets (termed as TiO₂-001), resulting in a tightly coupled heterointerface and desirable band offsets. The as-prepared CsPbBr₃/TiO₂-001heterojunctions exhibit boosted charge carrier kinetics, particularly, quick carrier separation/transfer and efficient utilization. Experimental results and theoretical calculations validate the S-scheme route in CsPbBr₃/TiO₂-001, which allows the enrichment of strongly conserved electrons-holes at conduction and valence bands of CsPbBr₃ and TiO₂-001, respectively. Consequently, compared to its counterparts, an excellent bifunctional activity (with 24 h reusability) is realized over CsPbBr₃/TiO₂-001, where the production rate of CO and benzaldehyde reach up to 78.06 μmol g^-1h⁻¹ and 1.77 mmol g^-1h⁻¹ respectively, without employing any sacrificial agents. This work highlights the development of perovskite-based heterostructures and describes the efficient harnessing of redox potentials and charge carriers towards combined photocatalytic systems.

制造一种具有成本效益且高活性的光催化剂来同时将CO ₂还原为CO并将苯甲醇氧化为苯甲醛是具有挑战性的。在此，我们构建了用于双功能光催化的S型0D/2D CsPbBr ₃ /TiO ₂异质结构。采用原位合成路线，使得CsPbBr 3 纳米晶体和暴露有(0 0 1)面的超薄TiO 2 纳米片（称为TiO 2 -001）之间能够精确集成，_从而产生紧密耦合的_异质界面_和理想的能带偏移。所制备的CsPbBr ₃ /TiO ₂ -001异质结表现出增强的载流子动力学，特别是快速载流子分离/转移和高效利用。_{实验结果和理论计算验证了CsPbBr 3} /TiO ₂ -001中的S型路线，这使得CsPbBr ₃和TiO ₂ -001的导带和价带上的强保守电子空穴分别富集。因此，与同类产品相比，CsPbBr ₃ /TiO ₂ -001实现了优异的双功能活性（具有24小时可重复使用性），其中CO和苯甲醛的产率高达78.06 μmol g ^-1 h ^-1和1.77 mmol分别为g ^-1 h ^-1，不使用任何牺牲剂。这项工作重点介绍了基于钙钛矿的异质结构的发展，并描述了氧化还原电势和电荷载体对组合光催化系统的有效利用。