Nanoscale Janus Z-Scheme Heterojunction for Boosting Artificial Photosynthesis.

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.