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

Hanleem Lee,Hyoyoung Lee,Meeree Kim

doi:10.3390/catal11010061

Abstract

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

Highlights

Introduction nal affiliationsRapid industrialization and urbanization result in high energy consumption
We investigated the photodegradation of encapsulated perovskite quantum dots (QDs)
To understand the photodegradation behavior, we investigated the photophysical properties of various types of perovskite QDs: Pristine QD, encapsulated

Summary

Introduction

Rapid industrialization and urbanization result in high energy consumption. To generate the necessary energy, fossil fuels, nuclear energy, and natural energy sources such as solar, water, and wind power are used. Despite the global trend toward renewable energy, which generates energy via natural energy sources, the energy conversion efficiency of renewable energy systems is far behind those of fossil fuels and nuclear energy. The by-products of energy conversion using fossil fuels and nuclear energy cause serious problems around the globe. The release of carbon dioxide (CO2 ) from fossil fuels gives rise to various global problems such as a rise in the greenhouse effect. To satisfy the demands of our age, namely a high energy consumption and lower environmental pollution, we

Methods

Results

Conclusion