Bonding CdS-Sn2S3 eutectic clusters on graphene nanosheets with unusually photoreaction-driven structural reconfiguration effect for excellent H2 evolution and Cr(VI) reduction

- CdS-Sn2S3@rGO heterostructures were fabricated via a facile hydrothermal method.
- The optimized sample showed high efficient H2 production and Cr(VI) reduction.
- The reconfiguration of catalyst intensified the charge transfer and separation.

In this work, a novel CdS-Sn2S3@reduced graphene oxide (rGO) eutectic cluster heterostructures were synthesized via a facile one-pot hydrothermal method, which can make CdS-Sn2S3 uniformly dispersed onto the rGO nanosheets surface and thus form a specially active sites sustained-release tablets. The optimized sample displayed continuously increased visible-light-driven photocatalytic activity and strong durability both in photocatalytic hydrogen evolution and hexavalent chromium (Cr(VI)) reduction. With these results, we for the first time find the peculiarly structural reconfiguration effect produced in the CdS-Sn2S3@rGO composite, and the reaction-driven reconfiguring of graphene-based CdS-Sn2S3 eutectics can act as sustained-release system of active sites, which triggers incomparable merits, such as more active sites, shorter charge-transfer distance and the effective interfacial contact. In addition, the rGO nanosheets served as electron shuttle to efficiently accelerate the separation and transfer of photogenerated electron-hole pairs. These combined effects endowed the hybrids system with the ever-increasing hydrogen-generating efficiency and enhanced stability in reduction reaction.

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