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The g-C₃N₄@ZnIn₂S₄ heterostructures were successfully synthesized through a combination of thermal annealing and hydrothermal methods. To enhance the photocatalytic hydrogen production performance and explore the interface between charge carriers, heterostructures of g-C₃N₄@ZnIn₂S₄ were fabricated using varying weights of g-C₃N₄ nanostructures under visible light irradiation. Remarkably, the photocatalytic hydrogen production efficiency of g-C₃N₄@ZnIn₂S₄ heterostructures with 0.01 g g-C₃N₄ nanostructures was significantly improved, showing approximately 228.6 and 2.58 times higher than that of g-C₃N₄ nanostructures and ZnIn₂S₄ nanostructures, respectively. This enhancement in photocatalytic performance is attributed to the effective utilization of visible light and the efficient separation of photogenerated electron-hole pairs facilitated by the heterojunction structures. Moreover, the reusability test validated the outstanding performance of g-C₃N₄@ZnIn₂S₄ heterostructures, as they maintained high photocatalytic hydrogen production even after undergoing eight cycles without any noticeable decrease in efficiency. This study offers a promising strategy for designing and synthesizing an environmentally friendly g-C₃N₄@ZnIn₂S₄ heterojunction with potential applications in photocatalytic hydrogen evolution.