Preparation And Electrochemical Properties Of Nickel Hydroxide Composite Nanomaterials

Today, nanomaterials play an important status in the world because of its excellent performance, which have made applications for many areas. The development of nanomaterials also could promote the development of science and technology. With the emergence and regeneration of electronic products, it has become a major part in the field of electronics that to improve the performance of battery. As the cathode material of the electrode, nano-hydroxide nickel exhibited satisfactory electrocatalytic properties. The researches on nano-hydroxide nickel materials were ongoing based on their practical application. Some focused on the preparation of morphologies; some valued the exploration to perfect function by mix another compounds; while there were also another researches tended to explain the related principles or mechanisms. But all of them were designed to ameliorate the capacities and service the social production better.This article focuses on four parts, as follows:1. In the introduction part, First of all, the definition, classification, nature and the preparation, applications, development of nanomaterials were generalized briefly. Secondly, it described the polymorphs, capacities, synthetic and shortcomings to be solved、advancing of the nano-hydroxide nickel. And then it introduced the sensors, involved concept, applications and expounded the methods of electrode modified by chemistry for further. In finally, a brief statement was given about the objectives and content of this thesis.2. Synthesis nano-hydroxide nickel with cubic morphology. A certain amount of NaOH was added into the Ni(NO3)2/Cr(NO3)3solution, then formed Ni(OH)2/Cr(OH)3nano-composite product, which was different from the outcomes resulted from Ni(NO3)2or Cr(NO3)3separately under the some conditions, Ni(OH)2/Cr(OH)3were collide but Ni(OH)2or Cr(OH)3were sediment. The hydroxide nickel nano-composite materials made in this way showed better dispersion and stabilization. Through the studies some biosensors prepared by Ni(NO3)2/Cr(NO3)3, we can get such an conclusion:Cr(OH)3that in the nano-composite product play better dispersion and stability effects without undermine the performance.3. Stirring method-Preparation of spherical nickel hydroxide/gold nano-composite films. Ni(NO3)2/Au reacted with triethylamine diluted by toluene in the solution, and the product was then formed in the surface of the liquid film with the evaporation of the toluene. From the SEM pictures, we could see on the both sides of the thin film (film-gas and the film-liquid), the morphology is different, the surface of film-gas is relatively smooth, while the film-liquid surface can be observed the nanoparticles are spherical. Use both sides of the film were applied to Glu sensor, it found film-liquid provides a better electrocatalytic.4. Still way-Synthesis of flower-like Ni(OH)2/Au nano-composite membranes. In this part, we mixed toluene and triethylamine firstly, and then dropped the mixing organic reagent on the surface of the solution which contained nickel nitrate and gold. After a short time, Ni(OH)2/Au nano-composite membrane was assembled between the gas/liquid interface until the toluene disappeared. In the same with the above, the side exposed to air is much glossy, and we can see the flower-like particles from the side which contact with the water. Some sensors, such as Cys, DA, Vc and Glu sensors were prepared respectively by both sides of the membranes in the comparison of Cyclic Voltammeter, there were few distinguish. However, in the alkaline dielectric, one side of the membrane in contact with liquid emerged a large capacitance.