Reducing the Photodegradation of Perovskite Quantum Dots to Enhance Photocatalysis in CO2 Reduction

Solution-processed perovskite quantum dots (QDs) have been intensively researched as next-generation photocatalysts owing to their outstanding optical properties. Even though the intrinsic physical properties of QDs significantly improved, chemical stability these materials remains questionable. Their low long-term limits commercial applicability in photocatalysis. In this study, we investigated photodegradation mechanisms and hybrids via photoluminescence (PL) by varying excitation power ultraviolet (UV) exposure power. Defects interface between QD co-catalyst influence photo-stability QDs. Consequently, designed a stable film an in-situ cross-linking reaction with amine-based silane materials. The surface ligand comprising 2,6-bis(N-pyrazolyl)pyridine nickel(II) bromide (Ni(ppy)) 5-hexynoic acid improved Ni QD. Then, ultrathin SiO2 was fabricated using 3-aminopropyltriethoxy (APTES) harness strong binding energy amine functional group APTES content further increased through doping during purification short (3-butynoic acid). As result, rapid charge separation were successfully fabricated. Time-correlated single photon counting (TCSPC) PL study demonstrated that modified exhibited slow defect passivation enhanced This impeded generation hot carriers, which are critical factor photodegradation. Finally, red synthesized applying same strategy mixture green QD/Ni(ppy)/SiO2 displayed CO2 reduction capacity for CO (0.56 µmol/(g∙h)).