High-energy density and long-lived MnO2/TiO(1-x)Nx supercapacitor material and preparation thereof

Abstract

The invention relates to preparation of a high-energy density and long-lived MnO2 / TiO(1-x)Nx supercapacitor material, which comprises the steps of: (1) preparing a titanium dioxide nanotube by using an anodic oxidation method, that is, a titanium foil with the thickness being 50+ / -10 micrometers and the purity being 99.8% is taken as an anode, wherein one side of the titanium foil is contacted with an ethylene glycol electrolyte solution, and cathode is also made of the titanium foil; the stability of the electrolyte solution is kept at constant 20+ / -5 DEG C, voltage between the anode and the cathode is kept at 50+ / -8V, and a TiO2 nanotube array is acquired; (2) carrying out thermal insulation nitrogen treatment on the TiO2 nanotube at a temperature of 600 DEG C-900 DEG C for 35+ / -15 minutes in a tubular furnace to acquire a TiO(1-x)Nx nanotube array, wherein 0.6>=x>0; and (3) depositing a manganese dioxide nanolayer on the surface of the TiO(1-x)Nx nanotube array, thereby acquiring the flexible supercapacitor material.

Description

technical field [0001] The invention relates to the preparation of MnO with high power density, high energy density and long life 2 / TiO 1-x N x Supercapacitor material and preparation method. Background technique [0002] The world today is confronted with two major problems of energy shortage and environmental pollution, which restrict the sustainable development of human beings. The development of clean and renewable energy is a top priority. The environmental pollution caused by exhaust emissions of internal combustion engines is becoming more and more serious (especially in large and medium cities), and people are studying new power devices to replace internal combustion engines. The research and development of hybrid power, fuel cells and chemical batteries have achieved some results, but they have encountered disadvantages such as high cost and complex structure. Supercapacitor (supercapacitor or ultracapacitor), also known as electrochemical capacitor (electroch...

AI Technical Summary

Problems solved by technology

Double-layer capacitors have high power density and long life, but the energy density is relatively low, which is greatly limited in practical applications

Although the pseudocapacitor has a relatively high energy density, its power density is relatively low, and its charge-discharge cycle life is relatively low.

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