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Cobalt-nickel sulfide/nitrogen-doped carbon nanofiber composite material, preparation method and application

A technology of nitrogen-doped carbon and composite materials, which is applied in the manufacture of hybrid/electric double-layer capacitors and electrodes of hybrid capacitors. The effect of the shortcut preparation method

Inactive Publication Date: 2018-10-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cobalt-nickel sulfide is easy to agglomerate, which significantly inhibits the exposure of its active edges, and is prone to severe volume expansion and contraction during the redox reaction process, resulting in a decrease in its cycle performance.

Method used

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  • Cobalt-nickel sulfide/nitrogen-doped carbon nanofiber composite material, preparation method and application
  • Cobalt-nickel sulfide/nitrogen-doped carbon nanofiber composite material, preparation method and application
  • Cobalt-nickel sulfide/nitrogen-doped carbon nanofiber composite material, preparation method and application

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Embodiment 1

[0044] The method for preparing a cobalt nickel sulfide / nitrogen doped carbon nanofiber composite material disclosed in this embodiment includes the following steps:

[0045] (1) Cut the bacterial cellulose membrane into 4×5cm 2 Size, take out 50 pieces of 4×5cm 2 The size of bacterial cellulose is dispersed in 500mL deionized water, the preparation concentration is 1mol L -1 Potassium hydroxide solution, and then added dropwise to the above dispersion until the solution becomes neutral;

[0046] (2) Take out the neutral bacterial cellulose, put it in liquid nitrogen for cooling, and place it in a freeze dryer for 24 hours to freeze and dry;

[0047] (3) Weigh 500mg freeze-dried bacterial cellulose and disperse it in 400mL1molL -1 Add 0.67g of pyrrole to the hydrochloric acid in the same time and soak for 12h;

[0048] (4) Weigh 1.62g ferric chloride separately and dissolve it in 400mL 1mol L -1 In the hydrochloric acid;

[0049] (5) Add the above-mentioned acidic ferric chloride soluti...

Embodiment 2

[0056] The difference between this embodiment and embodiment 1 is that the concentration of cobalt nitrate in embodiment 1 is changed to 3.33 mmol L -1 The concentrations of nickel nitrate hexahydrate, thiourea, and hexamethylenetetramine decrease proportionally. The rest are the same as in Example 1.

Embodiment 3

[0058] The difference between this embodiment and embodiment 1 is that the carbonization temperature of step (7) in embodiment 1 is changed to 800°C. The rest are the same as in Example 1.

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Abstract

The invention belongs to the technical field of a transition metal chalcogenide-carbon material, and particularly to a cobalt-nickel sulfide / nitrogen-doped carbon nano-fiber composite material and a preparation method thereof. According to the preparation method, a polypyrrole / bacterial cellulose composite material is prepared through an acid solution oxidation method;; then high-temperature carbonization is performed on the polypyrrole / bacterial cellulose composite material in a tubular furnace for preparing a nitrogen-doped carbon nano-fiber, and in-situ growth of cobalt-nickel sulfide nano-particles is performed on the surface of the carbon nano-fiber according to a hydro-thermal method. The cobalt-nickel sulfide / nitrogen-doped carbon nano-fiber composite material has advantages of stable chemical property, high conductivity, high specific surface area, etc. According to the cobalt-nickel sulfide / nitrogen-doped carbon nano-fiber composite material and the preparation method thereof, cobalt-nickel sulfide nano-particles are uniformly loaded on the surface of the nitrogen-doped carbon nano-fiber, thereby effectively inhibiting aggregation of cobalt-nickel sulfide nano particles and sufficiently utilizing a three-dimensional network structure of bacterial cellulose. The cobalt-nickel sulfide / nitrogen-doped carbon nano-fiber composite material has advantages of high electric capacity, environment-friendly preparing process, low cost, etc. The cobalt-nickel sulfide / nitrogen-doped carbon nano-fiber composite material can become an ideal super-capacitor electrode material.

Description

Technical field [0001] The invention relates to a cobalt nickel sulfide / nitrogen doped carbon nanofiber composite material, a preparation method of the composite material, and an application of the composite material. Background technique [0002] Bacterial cellulose is a natural fiber produced through the process of microbial fermentation. It is different from the synthetic fibers required by some complex equipment and large factories. It has the advantages of low price, high mechanical strength, and abundant sources. The porous structure of bacterial cellulose and the nano-scale pore size distribution make it have a large specific surface and high porosity. Especially the surface of nano-scale carbon fiber after high temperature carbonization has many effective reactive sites, which can be used as a good template for Controllable synthesis of nanomaterials with specific morphology or size. Therefore, these special properties make it have extremely broad application prospects i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/40H01G11/30H01G11/86
CPCY02E60/13
Inventor 刘天西宁学良缪月娥周宇王开李斐
Owner DONGHUA UNIV