Interfacial Analysis of the Photocatalysts by Photo Electrochemical Properties and Heterojunction Formation by Z-scheme

Abstract

In concluding remarks, GCN+ZIF-8+WO3 and GCN+WO3 are synthesized by hydrothermal method. The synthesis of these composites by the hydrothermal method provided a large surface area and mic-porous structure which improved its electrochemical activity. GCN+WO3 shows good conductivity and electrochemical properties using 1M Na2SO4 as an electrolyte. GCN+WO3-based composites were shown higher photocurrent density of 4μm cm-2 than other photocatalysts. Electrochemical impedance results showed that GCN+WO3 showed lower resistance of almost 120 kohm resistance which is smaller than the rest of the catalyst. UV-Vis-DRS of GCN+ZIF-8+WO3 showed the band gap and Urbach energy of 2.52 eV and 0.19 eV energy respectively. This lower band gap catalyst can be used for further applications like the photodegradation of pollutants and many others. UV-Visible analysis is purely a light and matter phenomenon, and EIS is light and chemical interactions. XRD analysis confirmed the formation of GCN, ZIF-8 and WO3.