Research On The Controllable Synthesis And Electrochemical Performance Of Palladium-based Nanomaterials

Palladium(Pd)based nanomaterials have attracted a great research interest in the past two decades because of their unique properties associated with a wide range of applications,such as catalysis,hydrogen storage,optics,et al.The size,shape,composition,architecture and crystal structure of Pd-based nanomaterials are key factors to determine their physical and chemical properties.Until now,the size,shape,composition and architecture-controlled syntheses of Pd-based nanomaterials have been well studied.However,these nanosyntheses methods are usually multi-step and time-consuming,which greatly limit the practical application prospect of Pd-based nanomaterials.By regulating the assembly behaviours of amphiphilic surfactants,this thesis reports the syntheses of three Pd-based nanomaterials with different nanostructures(ultrathin nanowires,mesoporous nanospheres,hollow/asymmetric bowl-shaped mesoporous nanospheres)by a versatile,simple and efficient soft template method.The growth mechanisms of these Pd-based nanomaterials are thoroughly discussed;the relationships of structure/components and electrocatalytic properties are also elaborated carefully.The main findings are summarized below:Chapter 1: Briefly summarize the syntheses and characterizations of Pd-based nanomaterials,and the electrochemical applications of Pd-based nanomaterials are further investigated.The topic selection basis and research content of this master's thesis are further clarified.Chapter 2: Accurate syntheses and electrocatalytic application of one-dimensional ultrathin Pd-based nanowires.Ultrathin and single-crystal binary Pd Pt and Pd Ag alloy nanowires,ultra-long/thin ternary noble metal-(non-noble metal)-(non-metal)Pd Cu P nanowires are synthesized via in situ reduction and crystallization along assembled onedimensional rod-like micelles of surfactant.Due to the structural and compositional advantages,these three nanowires exhibit enhanced electrocatalytic activities toward hydrogen evolution reaction and ethanol oxidation reaction.Chapter 3: Precise syntheses and electrocatalytic application of Pd-based mesoporous nanospheres with controllable sizes and compositions.Pd-based mesoporous nanospheres(Pd Ag Cu,Pd BP,etc.)with precisely adjustable dimensions and components are synthesized via an aqueous one-pot method along assembled onedimensional rod-like micelles of surfactant are regulated.The self-assembly of surfactants into one-dimensional rod-like micelles and the synthesis of.Due to the multiple advantages of mesoporous nanospheres structures and multicomponent compositions,Pd-based mesoporous nanospheres exhibited excellent electrocatalytic activity and stability.Chapter 4: Precise syntheses and electrocatalytic applications of hollow and asymmetric bowl-shaped Pd-based mesoporous nanospheres.By controlling the selfassembly of surfactant into one-dimensional rod-like micelles and zero-dimensional spherical vesicles,hollow and asymmetric bowl-shaped Pd-based mesoporous nanospheres with hierarchical nanostructures are designed and synthesized by "double" template method.The compositions,structures,formation mechanisms and the catalytic mechanism of Pd-based nanomaterials are investigated carefully.Chapter 5: The contents of this thesis were summarized.