Anodic Dissolution Of Metal For Synthesis Of Precursors And Study On Preparation And Characterization Of Nano-Sized NiO And ZnO

The paper is composed of the following three parts:In the first part the precursors of nano-materials are synthesized by anodic dissolution of metal in non-aqueous media. Electrochemical performance of metallic nickel electrode in non-aqueous ethanol indicates nickel can be dissolved if only the potential is higher than a certain value. It also indicates that halogen ion can promote the dissolution. The nano-material precursors of metal alkoxides and theirs complexes are prepared by anodic dissolution of metal in non-aqueous media with a small quantity of ion-conductive additive and acetylacetonate under 3 0-40 .In the second part preparation and characterization of nano-sized NiO and ZnO are studied. The electrolyte solution can be directly hydrolyzed through sol-gel process to obtain gel of high quality. Then the gel is calcined at different temperature to obtain the nano-powder. The property of nano-sized powder obtained from different precursors and different hydrolysis processes is compared. The results of XRD show that nickel oxide has a cubic NaCl structure and zinc oxide has a hexagonal ZnS structure. TEM micrographs show that the nano-sized powder is dispersing and the size is uniformity with a distribution of 10-20nm (NiO) and 5-10nm (ZnO).In the third part we prepare nano-sized NiO film on nickel electrode and investigate its electrochemical performance. The nano-sized NiO film on nickel electrode is obtained by dipping the nickel electrode in the sol and raising, then calcined under 450 for one hour. The study of its electrochemical performance in different media exhibits its excellent properties, such as electrochemical capacitor property, electrochromic property, etc.