Yuan Su-Xian, Su Ke, Zhang Meng-Ran, Feng You-Xiang, Li Yu, 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.
Small. 2025 Feb;21(8):e2409909. doi: 10.1002/smll.202409909. Epub 2025 Jan 14.
The photocatalytic activity of lead-free perovskite heterostructures currently suffers from low efficiency due to the lack of active sites and the inadequate photogenerated carrier separation, the latter of which is hindered by slow charge transfer at the heterostructure interfaces. Herein, a facile strategy is reported for the construction of lead-free halide-perovskite-based heterostructure with swift interfacial charge transfer, achieved through direct partial conversion of 2D antimony oxybromide SbOBr to generate CsSbBr/SbOBr heterostructure. Compared to the traditional electrostatic self-assembly method, this approach endows the CsSbBr/SbOBr heterostructure with a tightly interconnected interface through in situ partial conversion, significantly accelerating interfacial charge transfer and thereby enhancing the separation efficiency of photogenerated carriers. The cobalt-doped CsSbBr/SbOBr heterostructure demonstrates a record-high electron consumption rate of 840 µmol g h for photocatalytic CO reduction to CO coupled with HO oxidation to O, which is over 74- and 16-fold higher than that of individual SbOBr and CsSbBr, respectively. This work provides an effective strategy for promoting charge separation in photocatalysts to improve the performance of artificial photosynthesis.
目前，无铅钙钛矿异质结构的光催化活性由于缺乏活性位点以及光生载流子分离不充分而效率较低，其中后者受到异质结构界面处缓慢电荷转移的阻碍。在此，报道了一种简便策略，通过将二维溴氧化锑（SbOBr）直接部分转化以生成CsSbBr/SbOBr异质结构，来构建具有快速界面电荷转移的无铅卤化物钙钛矿基异质结构。与传统的静电自组装方法相比，这种方法通过原位部分转化赋予CsSbBr/SbOBr异质结构紧密相连的界面，显著加速界面电荷转移，从而提高光生载流子的分离效率。钴掺杂的CsSbBr/SbOBr异质结构在光催化将CO还原为CO并将HO氧化为O的过程中，展现出创纪录的高电子消耗速率840 µmol g h，分别比单独的SbOBr和CsSbBr高出74倍和16倍以上。这项工作为促进光催化剂中的电荷分离以提高人工光合作用性能提供了一种有效策略。
