Processing Of AgPd And AgAu Nanobowls Loaded With Au Nanorods And Their Photo-Assisted Catalytic Properties

For quite some time,“hot electrons”and“hot holes”generated by the decay of Plasmon of metal were not considered important to improve the catalytic activity of metal because of the short life of“Hot electrons”and“hot holes”.However,some recent studies reported that,if the surrounding around metallic catalysts is suitable for the separation of“hot electrons”and“hot holes”,these hot carriers can efficiently participate in catalytic reactions,improving the catalytic activity of metal catalysts.This thesis focuses on the design of symmetry-reduced metal nanostructure to enhance the separation efficiency of“hot electrons”and“hot holes”,and attempts to reveal the nature of plasmon-assisted catalysis:（1）Au-nanorod-in-AgPd-nanobowls,after interfacial assembly Au nanorod/Ag core/shell cubic nanoparticles,were fabricated at toluene/water interfaces by interface-oriented etching on one specific face of Au nanorod/Ag core/shell cubic nanoparticles with Pd²⁺ions.This study provides a new top-down strategy for designing symmetry-reduced hierarchical nanostructures.（2）Under the radiation of light matching the plasmon adsorption band of Au/AgPd,Au/AgPd exhibits superior electrocatalytic activity.A series of experiments related to wavelength-and temperature-dependent activity and the calculation of activation energy show that“hot holes”generated from the plamon decay participate in the methanol oxidation,contributing for the improvement of Au/AgPd catalytic activity.Particularly,under 660 nm laser irradiation,Au/AgPd shows a mass activity of 15 A mg _Pd^-1,～16 times better than commercial Pd/C.（3）Au-nanorod-in-Ag Au-nanobowls,after interfacial assembly Au nanorod/Ag core/shell cubic nanoparticles,were fabricated at toluene/water interfaces by interface-oriented etching on one specific face of Au nanorod/Ag core/shell cubic nanoparticles with Au³⁺ions,and used for plasmon-assisted reduction of p-nitrophenol.The results indicate that Au-nanorod-in-Ag Au-nanobowls exhibit satisfactory plasmon-enhanced catalytic activity under visible light irradiation because of the production of“hot electrons”and the acceleration of the reduction rate of p-nitrophenol.