Su Ke, Yuan Su-Xian, Wu Li-Yuan, Liu Zhao-Lei, Zhang Min, Lu Tong-Bu
MOE International Joint Laboratory of Materials Microstructure, Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China.
Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, 300384, China.
Small. 2023 Aug;19(32):e2301192. doi: 10.1002/smll.202301192. Epub 2023 Apr 17.
Artificial photosynthesis for CO reduction coupled with water oxidation currently suffers from low efficiency due to inadequate interfacial charge separation of conventional Z-scheme heterojunctions. Herein, an unprecedented nanoscale Janus Z-scheme heterojunction of CsPbBr /TiO is constructed for photocatalytic CO reduction. Benefitting from the short carrier transport distance and direct contact interface, CsPbBr /TiO exhibits significantly accelerated interfacial charge transfer between CsPbBr and TiO (8.90 × 10 s ) compared with CsPbBr :TiO counterpart (4.87 × 10 s- ) prepared by traditional electrostatic self-assembling. The electron consumption rate of cobalt doped CsPbBr /TiO can reach as high as 405.2 ± 5.6 µmol g h for photocatalytic CO reduction to CO coupled with H O oxidation to O under AM1.5 sunlight (100 mW cm ), over 11-fold higher than that of CsPbBr :TiO , and surpassing the reported halide-perovskite-based photocatalysts under similar conditions. This work provides a novel strategy to boost charge transfer of photocatalysts for enhancing the performance of artificial photosynthesis.
由于传统Z型异质结的界面电荷分离不足，目前用于CO还原与水氧化耦合的人工光合作用效率较低。在此，构建了一种前所未有的CsPbBr₃/TiO₂纳米级双面Z型异质结用于光催化CO还原。得益于短的载流子传输距离和直接接触界面，与通过传统静电自组装制备的CsPbBr₃:TiO₂对应物（4.87×10⁻⁸ s⁻¹）相比，CsPbBr₃/TiO₂在CsPbBr₃和TiO₂之间表现出显著加速的界面电荷转移（8.90×10⁻⁸ s⁻¹）。在AM1.5阳光（100 mW cm⁻²）下，钴掺杂的CsPbBr₃/TiO₂用于光催化将CO还原为CO同时将H₂O氧化为O₂的电子消耗速率可达405.2±5.6 μmol g⁻¹ h⁻¹，比CsPbBr₃:TiO₂高出11倍以上，并且在类似条件下超过了已报道的卤化物钙钛矿基光催化剂。这项工作提供了一种新策略来促进光催化剂的电荷转移以提高人工光合作用的性能。
