Controlled Synthesis Of Functional Micro/Nano Materials And Their Electric Catalytic And Sensor Research

The development of micro/nanoscience and micro/nanotechnology has attracted scientists to continuously search novel electrode materials for enhancing the electrocatalytic activity and constructing electrochemical platform for sensing. The properties of micro/nano materials are determined by a set of parameters, such as composition, size, shape, morphology, and structure (solid versus hollow). By tuning these parameters, the properties of a micro/nano-based material can, in principle, be tailored to enhance its performance in a specific application.In recent years, shape control has received the greatest attention in exploration of micro/nano materials made of metals. Controlling the shape of micro/nano materials may initially seem like a scientific curiosity, but its impact goes far beyond aesthetic appeal. In the past two decades, great efforts have been focused on self-assembly of low-dimensional building blocks into three-dimensional (3D) hierarchical architectures, which show special properties and potential applications. Compared to the enormous success for micro/nano materials, the shape-controlled synthesis of micro/nano materials is still in a very early stage of development.On the basis of previous research, this paper mainly studied the controllable preparation of several Hierarchical micro/nano materials and their applications in electrocatalysis and electrochemical sensor. Specific experiment includes the following three parts:(1) Facile synthesis of porous worm-like Pd nanotubes with high electrocatalytic activity and stability towards ethylene glycol oxidationA facile method was developed for large-scale preparation of porous worm-like Pd nanotubes based on the reduction of PdO nanotubes, which were obtained by calcining the complex precipitation of [Pd(dimethylglyoxime)2]n. The Pd catalyst showed excellent electrocatalytic activity and stability towards ethylene glycol oxidation, which provide a promising strategy to construct efficient electrocatalysts for efficient fuel cell applications.(2) Urea assisted electrochemical synthesis of flower-like platinum arrays with high electrocatalytic activityA simple and controllable method has been developed for the electrodeposition of monodispersed Pt nanoflowers on the GCE. The effects of the different experimental parameters were researched by varying the applied potentials, electrodeposition time, urea concentrations, or the amount of H2PtCl6. And urea has a significant impact on the growth of Pt deposits. The obtained Pt nanoflowers possess larger electroactive surface area (ESA) and show excellent electrocatalytic activity towards the EG oxidation in comparison with Pt nanoparticles.(3) Facile synthesis of MnO2-Ag hollow microspheres with sheet-like subunits and their catalytic propertiesHierarchical MnO2-Ag hollow microspheres (HMs) with sheet-like subunits were facilely prepared through in situ redox reaction and spontaneous self-assembled orientation via Ostwald ripening in a urea solution under lower hydrothermal temperature (130℃), without using any seed, template or capping agents. The as-prepared samples display excellent electrocatalytic ability by the typical amperometric detection of H2O2as a model system.(4) Facile synthesis of monodisperse porous Cu2O nanospheres on reduced graphene oxide for non-enzymatic amperometric glucose sensingUniform porous Cu2O nanospheres were facilely prepared with the assistance of ionic liquid crystal1-hexadecyl-2,3-dimethylimidazolium bromide [C16MMIm]Br as a structure-directing agent. The as-prepared Cu2O nanospheres were deposited on the RGOs surface with well dispersion under ultrasonication. The as-synthesized RGOs-Cu2O composite exhibited excellent electrocatalytic activity toward glucose oxidation. The novel RGOs-Cu2O composite offer potential applications in detection devices of glucose.