Nanofibrous three-dimensional nickel hydroxide/carbon nanotube composite material and its preparation method and application

Abstract

The invention discloses a preparation method of a nanofiber-shaped three-dimensional nickel hydroxide / carbon nanotube composite material. The method comprises the following steps: treating a multi-wall carbon nanotube with a mixed acid of a concentrated sulfuric acid and a concentrated nitric acid so as to obtain an acidified carbon nanotube; soaking foamed nickel with an acid, respectively washing the foamed nickel with water and an organic solvent so as to remove oxides and greases on the surface of the foamed nickel; and putting the treated foamed nickel in a mixed solution of the acidified carbon nanotube, nickel chloride and urea, carrying out hydrothermal reaction, cooling after the reaction, taking out the foamed nickel, washing and drying, thereby obtaining the nanofiber-shaped three-dimensional nickel hydroxide / carbon nanotube composite material on the substrate of the foamed nickel. The method is simple to operate; and the obtained composite material has a good three-dimensional space structure, wherein the nickel hydroxide is fibriform and is dispersed around the carbon nanotube well. Compared with the flake nickel hydroxide prepared under the same condition, the composite material disclosed by the invention has the good capacitance characteristic and can be taken as a capacitor material for applications.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a nickel hydroxide / carbon nanotube composite material, a preparation method thereof and an application in capacitors. Background technique [0002] In recent years, with the vigorous development of communication and electronic industries, the popularity of various household appliances, mobile communication equipment, and portable computers, the demand for secondary batteries in electronic equipment has soared, making secondary batteries occupy more and more in daily life. more important position. Nickel hydroxide electrodes and related materials have important application value in fuel cells, electrolysis and electrosynthesis devices, and electrochemical capacitors, and the preparation of high-capacity, high-stack density and high-activity nickel hydroxide is the key to improving batteries and capacitance. key to performance. Nano-nickel hydroxide particles have small diameter ...

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Problems solved by technology

Traditional industrial production methods mostly obtain flake or spherical nickel hydroxide. At present, there are only a few reports on the synthesis of nanofibrous nickel hydroxide, but most of them use the method of chemical precipitation first and then hydrothermal reaction, which has cumbersome steps and complicated operation. , strong uncontrollability in the reaction process, etc., and nickel sulfate is used as the raw material for the synthesis. Due to the strong adsorption capacity of sulfate radicals, the synthesized product also has the disadvantages of many impurities and low purity.

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