Preparation method of nitrogen-doped carbon nanotube supercapacitor

Abstract

The invention discloses a preparation method of a nitrogen-doped carbon nanotube supercapacitor. The preparation method comprises the following steps: (1) preparing a stainless steel substrate; (2) carrying out vapor deposition on a one-dimensional carbon nanotube on the stainless steel substrate; (3) carrying out air annealing; and (4) preparing the nitrogen-doped carbon nanotube. Stainless steelis adopted as a substrate to be directly used for preparing the carbon nanotube, and Fe and Ni which are uniformly distributed in the substrate are used as catalysts, so other catalysts do not need to be introduced any more, and the raw material cost is reduced; Fe and Ni based on the stainless steel are uniform in distribution and good in corrosion resistance, and the prepared carbon nanotube isuniform and stable in structure; the specific surface area and the electrochemical activity are improved through air annealing treatment; nitrogen doping treatment can improve the hydrophilicity of the carbon nanotube, and enables the electrode to have an electric double-layer capacitor and a Faraday capacitor at the same time, thereby improving the capacitance performance of the electrode. The method provided by the invention is low in equipment requirement, controllable in cost and short in preparation time, and has a relatively great application prospect.

Description

technical field [0001] The invention belongs to the field of electrochemistry and material technology, and in particular relates to a method for preparing a nitrogen-doped carbon nanotube supercapacitor. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage device between physical capacitors and chemical batteries. Compared with traditional capacitors, it has greater energy density and higher power density than batteries, and has the advantages of no pollution, long cycle life, and high safety. [0003] Carbon nanotubes (CNTs) are seamless mesoporous tubular structures formed by convolving one or more layers of graphite sheets around the central axis at a certain helical angle, and are a special one-dimensional quantum material. Its special structural characteristics make it have better physical and chemical properties than other carbon materials. Its characteristics include: large specific surface area, ex...

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Problems solved by technology

[0004] CNTs are considered to be an ideal supercapacitor electrode material, but pure CNTs have limited capacitive performance, and air annealing and nitrogen doping can effectively improve its performance

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