Enhancing the photocatalytic performance of ZnIn2S4 (ZIS) photocatalysts is a formidable task due to their structural and compositional challenges. In this investigation, a flower-like ZnIn2S4 was synthesized, coupled with a g-C3N4@ZIF-67 heterojunction, using a hydrothermal approach. Incorporating carbon-based composites led to a special electron trapping effect, effectively mitigating the photocatalytic limitations arising from the broader band gap, weak conductivity, and poor photocatalytic response activity of GCN. Consequently, introducing carbon-based composites facilitated the construction of a stable photocatalytic heterojunction. The formed heterojunction was characterized using XRD, FE-SEM, FE-TEM, EDS, XPS, electrochemical and Mott-Schottky measurements. The composite heterojunction photocatalyst, showcasing a bifunctional design, exhibited outstanding hydrogen production performance …