Constructing a 2D Heterointerface of MoS₂/MnIn₂S₄ with Improved Interfacial Charge Carrier Transfer for Photocatalytic H₂O₂ Production

High Resolution Image Download MS PowerPoint Slide Photocatalytic oxygen reduction to H 2 O 2 is a promising sustainable solar fuel production pathway. Photocatalysts with heterostructure interfaces can suppress charge carrier recombination and endow photogenerated electrons and holes with improved redox potentials. This study develops a heterostructured two-dimensional (2D) MoS 2 /MnIn 2 S 4 photocatalyst for photocatalytic H 2 O 2 production. The photocatalyst with an optimal loading of MnIn 2 S 4 on 2D MoS 2 nanosheets demonstrates the maximum H 2 O 2 production rate of 606.7 μmol g –1 h –1, approximately 4.2 and 5 times higher than pristine 2D MoS 2 and MnIn 2 S 4, respectively. The synergistic interaction between 2D MoS 2 nanosheets and MnIn 2 S 4 results in enhanced charge separation, optical absorption, stability, and recyclability. Reaction pathway studies reveal that H 2 O 2 production is through a sequential single-electron O 2 reduction reaction by accumulated photogenerated electrons on the conduction band of the 2D MoS 2 /MnIn 2 S 4 heterostructure. This work presents a noble-metal-free photocatalyst responsive to visible light for solar H 2 O 2 generation.