The Controllable Fabrication And Electrochemical Property Of Sb-based Nanowires Array

The research and applications of nanotechnology have almost extended to ourdaily life. They are going to set off a wave of the next worldwide industrialrevolution. To date, all traditional methods for fabrication of materials are used tosynthesize kinds of nanostructured dimension devices. The differences between thestandard techniques of materials fabrication and their related mechanisms have welldefined methods for nanostructures preparation, that is, nanophysics andnanochemistry.1-D （one-dimension） nanostructure is a typical nanostructuredsystem, including nanowires, nanorods, nanotubes, nanobelts, and so on. In recentyears, the applications of1-D nanostructure in photoelectric nanodevices, chemistryand biology sensor, and energy storage and converter are the increasingly activeresearch.1-D nanomaterials have features different from traditional materials, due totheir unique size effect. Specially, the expansion of nanowires along axial and radialdirection effectively eliminates the variation of stresses during charge/dischargeprocess. And thus, as a novel electrode material for LIBs, the studies of fabricationsand properties of nanowires array have become a hot topic. In this thesis, we reportthe main contents centering on Sb-based nanowires array as follows:1. The preparation technology and electrochemical property of AAO arrayThe AAO array is fabricated by twice anodic oxidation. We respectively chooseH2SO4（sulfuric acid） and H3PO4（phosphoric acid） as the electrolyte, regulate therelevant parameters （such as temperature, voltage value, and so on） and obtain theAAO array with different diameters and structure. By ruling the etch, we furtherstudy the feature and erosive property of AAO array. Furthermore, pilot study ofelectrochemical property of AAO array is conducted.2. The preparation process and electrochemical property of Ni₅Sb₂nanowiresarrayThe Ni₅Sb₂nanowires array is fabricated by direct-current potentiostaticelectrodeposition technique. In this part, the effects of Sb content and voltage valueon the products’ structure are discussed, respectively. Besides, the sample’s structure and morphology is characterized by XRD, SEM, EDS, TEM and HRTEM,respectively. The result shows that this sample has a preferred orientation along （022）diffraction peak, as well as a monoclinic structure （JCPDS card32-0041）. Thecharge-discharge test displays that this Ni₅Sb₂nanowires array electrode possessespreferable cycle stability.3. The fabrication and electrochemical properties of CoSb nanowires arrayBased on our group’s previous work, CoSb nanowires arrays are prepared bypulsed electrodeposition technique, and etched by3mol/L NaOH solution fordifferent time. And we get CoSb nanowires arrays with different etched structures.Then their charge-discharge properties are studied when they work as anodesmaterials for lithium ion batteries （LIBs）, respectively. The measurements show thatthey exhibit various charge-discharge properties in terms of the etched structures.Furthermore, these results indicate that highly ordered array structure is propitiousto improve charge-discharge capacity and cyclelife.