Highly efficient different morphologies of SnS 2 (nanoparticles, nanosheets, and 3D flower-like)/g-C 3 N 4 composites were, respectively, prepared via an elementary hydrothermal method that was integrated with the calcination means. The XRD results showed that the relative intensities of several diffraction peaks, especially (001), ( 100), (101), and (102), indicated that the as-prepared samples (SnS 2 nanoparticle, SnS 2 nanosheet, and 3D flower-like SnS 2 ) should be dominated by different specific preferred growth of facets. In comparison with SnS 2 and pure g-C 3 N 4 , the SnS 2 /g-C 3 N 4 composites exhibited much higher H 2 development performance under visible light irradiation in the presence of Na 2 SO 3 and Na 2 S as the sacrificial agent. The SnS 2 nanoparticles/g-C 3 N 4 composites exhibit the highest visible-light-driven H 2 -generation rate of 6305.18 μmol h −1 g −1 without any noble metal as cocatalyst, which is approximately 16.98 times higher than that of SnS 2 nanoparticles. In all, the SnS 2 nanoparticles (SnS 2 nanoparticle/g-C 3 N 4 composite) dominated by ( 001) and ( 100) preferred growth of facets exhibit significant photocatalytic activity resulting from their suitable band edges to realize the photocatalytic redox reaction. The analysis of photocurrent response, linear sweep voltammograms, and photoluminescence demonstrated that the low recombination rate and the efficacious charge transfer of photogenerated carriers could be assigned to the interactive impact of g-C 3 N 4 and SnS 2 .
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