Design Of Asymmetrical AgPd Nanostructure With Ag–AgPd Heterogeneous Junction For Electrocatalysis

Asymmetric nanomaterials were a kind of nanocomposite material with the inherent characteristics of nanomaterials,and exhibits asymmetric chemical properties,showing broad application prospects in the fields of catalysis,biotherapy,and environmental governance and so on.General methods for preparing asymmetric nanomaterials with controllable morphology and structure were complicated and lacked tenability.Therefore,this thesis focuses on the controllable and productive fabrication of asymmetry nanostructures by combining interface-oriented assembly and galvanic replacement at room temperature,and studies their electrocatalytic performances(1)One face of Ag nanocubes located at oil/water interfaces were etched by(C₆H₅CN)₂Pd Cl₂ existing in the oil,and transformed into asymmetric Ag P d bimetal nanostructures with Ag–Ag Pd heterojunctions.The morphology and composition of Ag–Ag Pd nanostructures can be easily tuned by adjusting reaction time,providing a convenient strategy for the production of asymmetrical nanostructure.Additionally,the formation of Ag–Ag Pd asymmetrical nanostructures can be explained well by an interface-oriented etching mechanism.(2)Ag–Ag Pd asymmetrical nanostructures show different catalytic capability to oxygen reduction reaction(ORR).Optimized Ag–Ag Pd asymmetrical nanostructures exhibits better ORR activity,comparable to commercial Pd/C:the catalytic current density is 0.243 A·mg^-1,the catalytic onset potential is 0.920 V,the half-wave potential is 0.827 V,and after 40000 s continuous catalysis,the current density remains 88.10%of the original.(3)Ag–Ag Pd asymmetrical nanostructures show different catalytic capability to ethanol electrooxidation reaction(EOR).Optimized Ag–Ag Pd asymmetrical nanostructures exhibits excellent EOR activity,?2.2 times better than commercial Pd/C.