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Plasmon-enhanced Hydrogen evolution reaction kinetics through the strong coupling of Au-O Bond on Au-MoO2 heterostructure nanosheets

Zhen Liu,Di Jiang,Linjing Yang,Jiayuan Yu,Xiao Li,Xiaoyan Liu,Lili Zhao,Xiao Li Zhang,Feng Han,Weijia Zhou,Hong Liu

How do the synergistic effects work and which dominate the distribution of active sites, that's an interesting question in mang plasmon-enhanced catalysis. Herein, we put a deep insight into the distribution of active sites and the mechanism of charge transfer at the noble metal-metal oxide interface for accelerating the hydrogen evolution reaction (HER) kinetics. A heterostructure of Au loaded MoO 2 nanosheets (Au-MoO 2 ) is prepared by the light-reduction method. EXAFS analysis demonstrates the tight coupling at Au-MoO 2 interface through the Au-O bond. An enhanced HER activity is observed with an overpotential decrease of (Δη) 176 mV and Tafel slop down to 52.5 mV/dec. KPFM measurement and FEM simulation verify the high local field enhancement at the junction. This field induces the concentrated surface charge through the Au-O bond. DFT calculation confirms the upraises filling of Op orbital in the Au-O bond, thus degrading the hydrogen adsorption energy level for HER kinetics.