Multi-pathway Photoelectron Migration and Photocatalytic Properties of AgIn5S8/Carbon Quantum Dots/ZnIn2S4

Firstly, ZnIn2S4 was modified by the up-conversion photoluminescence (UCPL) properties of carbon quantum dots (CQDs), and AgIn5S8/CQDs/ZnIn2S4 composite was prepared by ion-exchange method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (UV-VIS DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption test, photoluminescence (PL), and electrochemical impedance (EIS) were used to characterize the composition, structure, morphology, surface physical, and chemical properties of the composite. The results show that the synergistic effect between the different components in the composite results in a broad spectral response (250-800 nm). Compared with the comparative system, AgIn5S8/CQDs/ZnIn2S4 exhibited significantly enhanced photocurrent density, smaller charge transfer resistance, and prolonged photo-generated carrier lifetime. The photocatalytic activity of AgIn5S8/CQDs/ZnIn2S4 was studied under different light sources using methyl orange as the model molecule. The results showed that AgIn5S8/CQDs/ZnIn2S4 had an enhanced photocatalytic activity. At the same time, the composite not only had a high photolysis water hydrogen production capacity (312.09 mu mol.h(-1).g(-1)) but also had good stability.