Simultaneously Enhancing Activity and Stability of Perovskite by Grafting Dodecylphosphonic Acid for Selective...

Perovskite halides, a promising class of photocatalysts for the selective oxidation of C(sp³)H bonds, face critical challenges for practical implementation. Their inherent chemical instability under illumination and humid conditions, primarily driven by halide ion migration, remains a major obstacle to real-world application. In this work, dodecylphosphonic acid (DDPA)-grafted Cs₃SbBiBr₉ (CSBB) photocatalysts were achieved as an efficient and stable aerobic oxidation photocatalyst. The formation of strong MOP bonds between DDPA and CSBB directs charge transfer and suppress Br^- migration. Concurrently, the long alkyl chain (C₁₂) creates a hydrophobic surface, enhancing toluene adsorption while effectively repelling water and preventing perovskite hydrolysis. Remarkable toluene conversion rate of 21.648 mmol g^-1 and 85% selectivity towards benzaldehyde is realized, which is 3.8 times that of pristine CSBB. Moreover, the stability of CSBB was significantly enhanced after DDPA modification.