Fabrication of Uniform ZnO Hexagonal Nanorods in the Presence of Mg²⁺ and Conversion to ZnO@ZnS Heterojunctions for Spatial Charge Separation

Abstract Large‐scale uninform ZnO hexagonal nanorods were obtained by tuning the molar ratio of Mg²⁺ and Zn²⁺ without any organic surfactant or any further treatment, then the ZnO@ZnS heterojunction were obtained by in‐situ sulfidation method. The photocatalytic activity of as‐prepared photocatalyst sample was evaluated by their photocatalytic of Congo Red (CR) in a fixed‐bed microreactor and photocatalytic hydrogen production. The photocatalytic experiments showed that Z@ZS‐4 possesses higher photocatalytic performance for a sulfidation time up to 4 h. Probable photogenerated charge transfer mechanism has been proposed, and the corresponding photoluminescence and photoelectrochemical measurements revealed the higher charge transfer rate across the Z@ZS‐4 interface.