Abstract
Two-dimensional transition metal dichalcogenides (TMD) are promising cost-effective catalysts for electrochemical/photoelectrochemical hydrogen evolution reactions (HER). One of the strategies to enhance the inherent HER activity of a catalyst is to form heterostructures. Herein, a facile thermal treatment method is reported for the synthesis of a novel heterostructure catalyst, Molybdenum disulphide-Molybdenum trioxide-Rhenium oxide (MoS2-MoO3-Re2O7), for HER. MoS2-MoO3-Re2O7 composite is prepared using bulk MoS2, which is otherwise known as a weak HER catalyst. Electrochemical and photoelectrochemical studies substantiate the enhanced catalytic activity of the MoS2-MoO3-Re2O7 composite than the MoS2 bulk towards HER. The Mott-Schottky analysis suggests the formation of p-n heterojunction, which offers large interfacial contact and facilitates easier charge separation and transfer of photogenerated charge carriers resulting in an improved photoelectrocatalytic activity. The catalyst exhibits excellent stability, confirmed by the repeated cycles of reaction.
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