Abstract
The hot electrons induced by surface plasmon resonance and transferred from metal particles to MoS2 nanosheets have been reported as the mechanism for metal particles enhanced MoS2 photocatalysis in hydrogen evolution, which provides new strategies to design novel non-platinum catalysts for hydrogen generation. In this study, we propose a new perspective to understand metal particles enhanced MoS2 photocatalysis for hydrogen evolution by a combined electrodynamic and density functional theory (DFT) calculation. The electrodynamic calculation reveals that the electric field could be excited around Au NPs during a surface plasmon resonance process, depending on the position and distance away from the NPs. Meanwhile, the DFT calculation shows the electric field would influence the charge and adsorption energy of the hydrogen atom on the MoS2 surface, which will affect the hydrogen evolution catalysis process of a MoS2-Au NPs system. Therefore, the excited electric field should be another reason for the enhanced photocatalysis of MoS2, other than the “hot electrons” mechanism.
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