Facile Fabrication of 2D/0D ZnSe/ZnO Heterostructures for Efficient Photocatalytic Degradation of Organic Dye

In order to improve the light absorption capacity of ZnO and inhibit the recombination of photogenerated charge carriers, we prepared ZnSe/ZnO heterostructures using a simple electrostatic self‐assembly method. The experimental results showed that 0D ZnO nanoparticles (NPs) were successfully loaded onto the surface of 2D ZnSe nanosheets (NSs), forming heterostructures. This composite structure increased the number of reactive adsorption–desorption sites, which was beneficial for accelerating the photocatalytic reaction rate. The 3D open skeleton composite structure of ZnSe NSs/ZnO NPs helped to improve the utilization efficiency of incident light in photocatalytic processes. In addition, the energy bands of ZnSe NSs and ZnO NPs are arranged in a staggered manner, forming a typical Type‐II semiconductor heterostructure, effectively inhibiting the recombination of photogenerated charge carriers. We also investigated the relationship between component ratio and photocatalytic activity. Under UV and visible light irradiation, the ZnSe NSs/ZnO NPs nanocomposites (ZZ5) showed significantly higher photocatalytic degradation efficiency for the organic dye RhB than pure ZnO NPs, achieving over 90%. This enhancement is attributed to the optimal component ratio, which is conducive to the separation of photogenerated charge carriers and improves the utilization efficiency of incident light.