Abstract
A popular strategy for constructing localized surface plasmon resonance (LSPR)-enhanced plasmonic metal heterostructure catalysts is to fabricate a composite of highly active materials with plasmonic metal nanomaterials. However, this kind of combination not only decreases the LSPR response intensity but also changes the hot electron transport pathway inside the heterogeneous structure, which induces the ineffective transfer of plasmonic hot electrons to the surface of the heterostructures and hinders the effective enhancement of catalytic activity. Herein, simple Ag@Pt bimetallic nanocubes are selected to explore the mechanism of hot electrons from excitation and transmission within a plasmonic metal het-erostructure and their contribution to the electrochemical hydrogen evolution reaction (HER). The corresponding experimental and theoretical results confirm that the hot electrons (holes) become a dominant plasmon decay pathway owing to the introduction of thin Pt shells and HER can be significantly enhanced by hot electrons via a cascaded manner, i.e., first being excited in Ag, then pumped from Ag atoms to Pt atoms and accumulated on the surface of Pt. This work provides an important reference for the design and application of plasmonic metal heterostructure catalysts.
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