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Metal hydroxide hollow nanotube, preparation method thereof and application thereof

A technology of hydroxide and nanotubes, which is applied in the field of nanomaterials, can solve problems such as poor thermal stability, material agglomeration, and one-dimensional structure collapse, and achieve the effects of low reaction cost, high product purity, and high specific capacitance characteristics

Active Publication Date: 2017-09-01
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, carbon nanotubes also have some disadvantages as templates
Due to the high degree of carbonization of the carbon nanotube template, which is both acid and alkali resistant, it is difficult to remove and needs to be heated to 400°C in the air to achieve, which often leads to the collapse of the one-dimensional structure and the agglomeration of materials.
At the same time, some metal-based compounds with poor thermal stability, such as metal hydroxide materials, are difficult to obtain by this method

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  • Metal hydroxide hollow nanotube, preparation method thereof and application thereof
  • Metal hydroxide hollow nanotube, preparation method thereof and application thereof
  • Metal hydroxide hollow nanotube, preparation method thereof and application thereof

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preparation example Construction

[0042] The invention provides a method for preparing metal hydroxide hollow nanotubes, comprising the following steps:

[0043] A) using tellurium nanowires as templates and carbohydrates as carbon sources to obtain carbon nanofibers through hydrothermal carbonization;

[0044] B) mixing the carbon nanofibers with the metal salt precursor and heating the reaction in an oil bath to obtain carbon nanofibers coated with the metal salt precursor;

[0045] C) performing alkaline etching on the carbon nanofibers coated with the metal salt precursor to obtain metal hydroxide hollow nanotubes.

[0046] The invention can prepare metal hydroxide hollow nanotubes, the method is simple and practical, and easy to be popularized on a large scale. Moreover, the metal hydroxide hollow nanotube has excellent electrochemical performance and has a good application prospect.

[0047] In the embodiment of the present invention, carbon nanofiber templates are first prepared: ultrafine tellurium n...

Embodiment 1

[0072] (1) Preparation of carbon nanofibers: Add 10g of polyvinylpyrrolidone and 920mg of sodium tellurite into 320mL of water, stir well, then add 33.3mL of ammonia water and 16.7mL of hydrazine hydrate, stir well and transfer to 500mL of polytetrafluoroethylene In an ethylene reactor, react in an oven at 180° C. for 3 hours to obtain a tellurium nanowire dispersion. Wherein, the diameter of the tellurium nanowire is 7nm.

[0073] 10 mL of the tellurium nanowire dispersion was added to 30 mL of acetone, and centrifuged at a centrifugal speed of 8000 rpm for 4 minutes to obtain a tellurium nanowire precipitate. Then, the tellurium nanowire precipitate was dispersed in 80 mL of water, 5 g of glucose was added, transferred to a 100 mL polytetrafluoroethylene reactor, and reacted in an oven at 180 ° C for 18 h to obtain a carbon nanofiber hydrogel. The carbon nanofiber hydrogel was centrifuged and washed with ethanol, and dried in a vacuum oven at 60° C. for 12 hours to obtain 2...

Embodiment 2

[0078] Metal hydroxide nanotubes were prepared according to the method in Example 1, with the following differences: the alkali etching time was 2 hours.

[0079] Gained product is carried out transmission electron microscope analysis, the result sees Figure 5 . Compared with Example 1, it is found that the carbon nanofiber template in the middle is not completely etched, and some parts remain, which is a semi-hollow structure, and the diameter of the hollow part is about 150 nm.

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Abstract

The present invention provides a metal hydroxide hollow nanotube, a preparation method thereof and the application thereof. The method comprises the following steps: A) mixing up an ultra-fine tellurium nanowire with glucose, and subjecting the mixture to hydrothermal carbonization process to obtain a carbon nano-fiber; B) mixing the carbon nano-fiber with a metal salt precursor, and subjecting the mixture to oil-bath heating reaction to obtain the carbon nano-fiber coated by the metal salt precursor; C) subjecting the metal salt precursor-coated carbon nano-fiber to alkali etching process so as to remove a carbon nano-fiber template, and obtaining a hollow metal hydroxide nanotube. The method is simple and practical, and an obtained product is high in purity. The method is low in reaction cost and is easy in large-scale popularization. When the nano-tube is applied as the electrode material of an electrochemical super capacitor, the nano-tube is very high in specific capacitance property and superior to reported values in most literatures. Therefore, the nano-tube is expected to be applied to the field of electrochemical super capacitors.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a metal hydroxide hollow nanotube and its preparation method and application. Background technique [0002] Hollow structural transition metal materials have attracted great attention due to their well-defined internal channels and functionalized shells. Materials with this unique structure have many advantages, including low density, large porosity, high specific surface area, etc. These advantages make the hollow structure transition metal materials have good application value in the fields of energy storage and conversion, gas sensing, catalytic reaction, drug release and so on. In particular, as electrode materials for electrochemical energy storage devices, materials with hollow structures have obvious advantages in specific capacity and cycle stability compared with non-hollow materials. Therefore, this type of material is considered to be a promising electrode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/30C01G45/02C01G51/04C01G53/04B82Y30/00B82Y40/00
CPCY02E60/13H01G11/86B82Y30/00B82Y40/00C01G45/02C01G51/04C01G53/04H01G11/24H01G11/30
Inventor 俞书宏余自友
Owner UNIV OF SCI & TECH OF CHINA
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