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Preparation method for carbon-coated nickel oxide NiO/C as supercapacitor electrode material

A technology for supercapacitors and electrode materials, which is used in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of inability to uniformly coat NiO electrode materials, and achieves problems such as solving large-scale application difficulties, improving rate specific capacitance, Simple preparation method

Inactive Publication Date: 2013-07-24
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these methods can uniformly coat NiO electrode materials, so it is still a challenge to develop an effective method to uniformly coat NiO electrode materials.

Method used

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  • Preparation method for carbon-coated nickel oxide NiO/C as supercapacitor electrode material
  • Preparation method for carbon-coated nickel oxide NiO/C as supercapacitor electrode material
  • Preparation method for carbon-coated nickel oxide NiO/C as supercapacitor electrode material

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Experimental program
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Effect test

Embodiment 1

[0024] (1) Weigh the raw material nickel acetate (Ni(CH 3 COO) 2 ·4H 2 O) 5mmol, urea (2g) and polyvinylpyrrolidone (PVP) 1g are dissolved in absolute ethanol and water and stirred to prepare a mixed solution; wherein the volumes of the absolute ethanol and water are 10ml and 40ml respectively;

[0025] (2) Pour the above-mentioned mixed solution into a polytetrafluoroethylene hydrothermal reactor to maintain 80% filling degree, put the hydrothermal reactor into a blast drying box, and react for 8 hours under hydrothermal conditions at 180°C , And then cool the reactor to room temperature.

[0026] (3) The products obtained by centrifugation were washed with deionized water and ethanol solvents respectively, and dried; the dried samples were placed in a muffle furnace at 1°C / min to 450°C and calcined for 40 minutes.

[0027] (4) Weigh 0.2g of NiO sample, dissolve it in 36ml glucose solution, and stir to prepare a mixed solution; wherein the concentration of the glucose solution is 0....

Embodiment 2

[0031] (1) Weigh the raw material nickel acetate (Ni(CH 3 COO) 2 ·4H 2 O) 5mmol, urea (3g) and polyvinylpyrrolidone (PVP) 1g are dissolved in absolute ethanol and water and stirred to prepare a mixed solution; wherein the volumes of the absolute ethanol and water are 10ml and 40ml respectively;

[0032] (2) Pour the above-mentioned mixed solution into a polytetrafluoroethylene hydrothermal reactor to maintain 80% filling degree, put the hydrothermal reactor into a blast drying box, and react for 3 hours under hydrothermal conditions at 200°C , And then cool the reactor to room temperature.

[0033] (3) The products obtained by centrifugation were washed with deionized water and ethanol solvents respectively, and dried; the dried samples were placed in a muffle furnace at 1°C / min to 450°C and calcined for 40 minutes.

[0034] (4) Weigh 0.3 g of NiO sample and dissolve it in 36 ml of glucose solution and stir to prepare a mixed solution; wherein the concentration of the glucose solutio...

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Abstract

The invention relates to a preparation method for carbon-coated nickel oxide NiO / C as a supercapacitor electrode material, comprising the steps that (1) nickel acetate Ni (CH3COO)2.4H2O, urea and polyvinylpyrrolidone are dissolved in absolute ethyl alcohol and water and stirred, so that a mixed solution is obtained; (2) the mixed solution is subjected to hydrothermal reaction, and after the reaction is finished, the mixed solution is cooled, centrifuged, rinsed, dried and calcined, so the NiO material is obtained; (3) the NiO is dissolved in a glucose solution and stirred, to obtain a mixed solution, the mixed solution is subjected to hydrothermal reaction, and after the reaction is finished, the mixed solution is cooled, centrifuged, rinsed, dried and calcined, so that the carbon-coated nickel oxide NiO / C is obtained. The NiO / C electrode material prepared by the method disclosed by the invention is in porous structure and has high specific surface area, meanwhile the overall conductivity of the NiO electrode material can be improved due to the carbon layer, and the carbon and the NiO have synergistic effect, so that the specific capacitance and speed ratio capacitance, and the NiO / C is an excellent supercapacitor electrode material.

Description

Technical field [0001] The invention belongs to the field of preparation of capacitor electrode materials, and in particular relates to a preparation method of super capacitor electrode material carbon-coated nickel oxide NiO / C. Background technique [0002] With the rapid development of the global economy, the continuous consumption of fossil energy, and the increasingly serious environmental pollution, it has become increasingly important to study an energy conversion and storage system that is efficient, low-cost, environmentally friendly, and high-performance. Supercapacitors have the advantages of high power density, short charging time, and long service life, and are widely used in electric vehicles, military, mobile communication equipment and other fields, which have attracted widespread attention from scientific researchers. Supercapacitors can be divided into electrochemical double-layer capacitors and Faraday pseudocapacitors. Carbon materials have the advantages of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/30
CPCY02E60/13
Inventor 胡俊青徐开兵邹儒佳李文尧安磊
Owner DONGHUA UNIV
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