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Preparation method and application of core-shell structured cobalt molybdate@ nickel cobaltate material

A technology of core-shell structure and cobalt molybdate, which is applied in the manufacture of hybrid/electric double layer capacitors and electrodes of hybrid capacitors, can solve the problems that active materials cannot be fully utilized, hinder development and application, and have poor electrical conductivity. Excellent electrochemical performance, environmental friendliness, and simple preparation process

Inactive Publication Date: 2017-08-18
河南新太行电源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Cobalt molybdate (CoMoO 4 ) has high specific capacitance, good cycle stability and rate capability, although CoMoO 4 It has a higher specific capacity than other metal oxides, but its development and application are still hindered by its poor electrical conductivity
In the Faraday pseudocapacitive energy storage method, only the active substances on or near the surface of the electrode material can participate in the redox reaction, and the active substances inside the material cannot be fully utilized, resulting in a specific capacity smaller than the theoretical value

Method used

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  • Preparation method and application of core-shell structured cobalt molybdate@ nickel cobaltate material
  • Preparation method and application of core-shell structured cobalt molybdate@ nickel cobaltate material
  • Preparation method and application of core-shell structured cobalt molybdate@ nickel cobaltate material

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Embodiment 1

[0030] A method for preparing a core-shell structure cobalt molybdate@nickel cobaltate material, which is prepared by the following steps:

[0031] (1) Pre-treat the nickel foam to remove oxides on the surface.

[0032] (2) Put the processed nickel foam vertically into a 25ml autoclave according to step 1; disperse a certain proportion of sodium molybdate, cobalt nitrate and sodium acetate in deionized water, and stir magnetically for 3 hours to obtain a uniform mixed solution. Then, the mixed solution was transferred to an autoclave for hydrothermal reaction at 60° C. for 2 hours, and finally, the pole piece was cleaned and dried.

[0033] (3) The above mixed solution was transferred to the reactor for the first hydrothermal reaction, the reaction temperature was 100°C, and the reaction time was 4h.

[0034] (4) After the reaction is completed, the obtained product is washed several times with deionized water, and dried to obtain a nanorod-shaped cobalt molybdate material

...

Embodiment 2

[0050] A method for preparing a core-shell structure cobalt molybdate@nickel cobaltate material, which is prepared by the following steps:

[0051] (1) Pre-treat the nickel foam to remove oxides on the surface.

[0052] (2) Put the processed nickel foam vertically into a 25ml autoclave according to step 1; disperse a certain proportion of sodium molybdate, cobalt nitrate and sodium acetate in deionized water, and stir magnetically for 3 hours to obtain a uniform mixed solution. Then, the mixed solution was transferred to a high-pressure reactor, and a hydrothermal reaction was carried out at 220° C. for 20 hours, and finally, the pole piece was cleaned and dried.

[0053] (3) The above mixed solution was transferred to the reactor for the first hydrothermal reaction, the reaction temperature was 180°C, and the reaction time was 10h.

[0054] (4) After the reaction is completed, the obtained product is washed several times with deionized water, and dried to obtain a nanorod-sh...

Embodiment 3

[0064] A method for preparing a core-shell structure cobalt molybdate@nickel cobaltate material, which is prepared by the following steps:

[0065] (1) Pre-treat the nickel foam to remove oxides on the surface.

[0066] (2) Put the processed nickel foam vertically into a 25ml autoclave according to step 1; disperse a certain proportion of sodium molybdate, cobalt nitrate and sodium acetate in deionized water, and stir magnetically for 3 hours to obtain a uniform mixed solution. Then, the mixed solution was transferred to an autoclave for hydrothermal reaction at 110° C. for 10 h, and finally, the pole piece was cleaned and dried.

[0067] (3) The above mixed solution was transferred to the reactor for the first hydrothermal reaction, the reaction temperature was 160°C, and the reaction time was 8 hours.

[0068] (4) After the reaction is completed, the obtained product is washed several times with deionized water, and dried to obtain a nanorod-shaped cobalt molybdate material...

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Abstract

The invention discloses a preparation method and application of a core-shell structure cobalt molybdate@nickel cobaltate material. The method can obtain a core-shell structure with a rod-like nanostructure cobalt molybdate as the core and a rod-like nanostructure nickel cobaltate as the shell. Cobalt molybdate@nickel cobaltate material. The structure provides a three-dimensional conductive network, which enables the electrode to have a higher specific surface area and porosity, so that the material exhibits better specific capacitance and cycle stability, and improves the electrochemical performance of a single material. The preparation process adopts a two-step hydrothermal reaction method. Compared with the prior art, the present invention has a wide range of sources of raw materials, the preparation process is simple and safe, green and pollution-free, the prepared product has high purity, good dispersibility, and the process is controllable. Low cost and good reproducibility.

Description

technical field [0001] The invention relates to a supercapacitor, in particular to a method for preparing a core-shell structure cobalt molybdate@nickel cobaltate material suitable for making an electrode material of a supercapacitor. Background technique [0002] With the rapid development of electric vehicles and portable electronic devices, the rapid depletion of fossil fuels and worsening environmental pollution, energy issues have become a huge challenge facing the 21st century. Among many energy storage devices, supercapacitors have attracted much attention due to their fast charge and discharge capability, high power performance, low maintenance cost and long cycle life. According to the energy storage mechanism, supercapacitors can be divided into two categories: electric double layer capacitors and faraday pseudocapacitors. In electric double layer capacitors, charges are accumulated on the surface of electrode materials and electrolyte solutions (such as carbon ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/86
CPCY02E60/13H01G11/46H01G11/86
Inventor 胡韶芳刘静杰穆培振柴和平杨忠祥李伟莉
Owner 河南新太行电源股份有限公司
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