Abstract
MoSe2 has attracted widespread attention owing to its ability to promote photocatalytic hydrogen evolution reaction (HER), but progress has been hindered by the lack of active site in the planar and the unsuitable Heyrovsky reaction. Here, onion-like MoSe2 with biaxially strained nanostructure (MoSe2-L) was synthesized by laser ablation in liquids. The photocatalytic HER rate was extensively promoted by MoSe2-L in the heterojunction of MoSe2-L/CN. The strain makes the negatively charged state of MoSe2-L. The negatively charged state would produce the adsorbed hydrogen atom negatively charged for the Heyrovsky reaction, which is conducive to the further adsorption of the next proton for H2 formation. Meanwhile, the strain can significantly enhance the charge transfer in the heterojunction, increasing photocatalytic H2 production. This study provided new insight into structural strain engineering in the photocatalytic HER field.
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