Three-dimensional network carbon nanotubes and its preparation method and use

Abstract

The invention discloses a three-dimensional network carbon nanotube, its preparation method and application. Carbon nanotubes include three-dimensional carbon nanotubes in which vertical carbon nanotubes are connected with horizontal carbon nanotubes, wherein, the vertical carbon nanotubes and the horizontal carbon nanotubes are each equipped with more than one fine carbon tube with a diameter of 18-22nm. nanotubes; the method includes using an anodic oxidation method to obtain a three-dimensional through-hole alumina template containing impurities on the hole wall, especially after soaking the template in a nickel sulfate solution, using plasma cleaning, and then placing it in argon and In a mixed atmosphere of acetylene, at 600-700° C. for at least 1 hour to obtain an anodized aluminum template with carbon nanotubes in the holes of the three-dimensional through holes and fine carbon nanotubes in the carbon nanotubes, and then place it The alumina template is corroded in alkaline solution to obtain the target product. It has large surface capacitance and high conductivity, and has important application prospects in the field of electrochemical energy storage devices with ultra-high power density and high capacity.

Description

technical field [0001] The present invention relates to a carbon nanotube and its preparation method and application, in particular to a three-dimensional network carbon nanotube and its preparation method and application. Background technique [0002] Three-dimensional carbon materials with large specific surface area have important application prospects in electrochemical energy storage and environmental management. Although the three-dimensional carbon nanotube array is a good electrochemical electrode material, because carbon nanotubes, like other one-dimensional nanomaterials, have a high aspect ratio, they are very easy to form agglomeration at the top, resulting in carbon nanotubes. The length of the arrays to remain isolated from each other is usually less than 10 μm; and the thinner carbon nanotube arrays cause their surface capacitance to be too small. Therefore, the synthesis of parallel and mutually isolated vertical carbon nanotube arrays with a certain thicknes...

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Problems solved by technology

Although the three-dimensional carbon nanotube array is a good electrochemical electrode material, however, because carbon nanotubes, like other one-dimensional nanomaterials, have a high aspect ratio, it is easy to form agglomerations at the top, resulting in carbon nanotubes The length of the arrays that are kept isolated from each other is usually less than 10 μm; and the thinner carbon nanotube arrays cause the surface capacitance to be too small. Therefore, the synthesis of vertical carbon nanotube arrays with a certain thickness parallel to each other and isolated from each other is useful in the field of electrochemical energy storage. is of great significance

Although this product has a better three-dimensional carbon network structure, there are still shortcomings. First, the tube lumens of the vertical carbon tubes and transverse carbon tubes that make up the three-dimensional carbon network structure are hollow, which leads to the partial surface capacitance of the product. small; Secondly, the conductivity of the product is too low, only 159S / m

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