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Carbon-coated cobalt molybdate network nanosheet array material, preparation method and application

A technology of nanosheet array and cobalt molybdate, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, and can solve the problem of reducing the electrochemical activity of materials, the decrease of electrical conductivity of composite materials, and low electrical conductivity, etc. problems, to achieve the effect of improving reaction kinetics and material utilization, improving specific capacitance and cycle performance, and good electrical conduction

Active Publication Date: 2017-02-22
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some deficiencies in these research works, such as cobalt molybdate and MnO 2 Composite encounters MnO 2 The low electrical conductivity leads to the problem that the overall electrical conductivity of the composite material decreases; although the composite with graphene can improve the electrical conductivity of cobalt molybdate, but this simple combination can improve the structural stability and cycle stability of cobalt molybdate Limited; after in-situ coating of carbon on the surface of cobalt molybdate powder material, it is necessary to use chemical binder to make electrode by scraping method. The non-conductive binder increases the internal resistance and reduces the effect of carbon coating, and this The active material of the electrode is densely packed, which will also reduce the electrochemical activity of the material. In addition, this composite material does not control the size and shape of cobalt molybdate, which will also affect the electrochemical performance of the material.

Method used

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  • Carbon-coated cobalt molybdate network nanosheet array material, preparation method and application
  • Carbon-coated cobalt molybdate network nanosheet array material, preparation method and application
  • Carbon-coated cobalt molybdate network nanosheet array material, preparation method and application

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Embodiment 1

[0040] Dissolve 0.875g cobalt nitrate and 0.725g sodium molybdate in 60mL deionized water, transfer the resulting mixed solution into a 100mL polytetrafluoroethylene reactor, and place a 2×2cm 2 Dip the foamed nickel into the mixed solution in the reaction kettle, seal the reaction kettle and put it in a blast drying box and heat it to 120°C for 5 hours. After the reaction kettle is naturally cooled to room temperature, take out the surface growth cobalt molybdate mesh nanosheet array The foamed nickel is washed with deionized water and dried at 60℃;

[0041] Dissolve 0.119 g of glucose in 60 mL of deionized water, transfer the obtained glucose solution into a 100 mL polytetrafluoroethylene reactor, immerse the nickel foam on the surface of the cobalt molybdate mesh nanosheet array in the glucose solution, and react After the kettle is airtight, it is placed in a blast drying box and heated to 120°C for 5 hours. After the reaction kettle is naturally cooled to room temperature, th...

Embodiment 2

[0050] Take 0.524g of cobalt nitrate and 0.436g of sodium molybdate dissolved in 60mL of deionized water, transfer the resulting mixed solution into a 100mL polytetrafluoroethylene reactor, the 2×2cm 2 Dip the foamed nickel into the mixed solution in the reaction kettle, seal the reaction kettle and put it in a blast drying box and heat it to 110°C for 6 hours. After the reaction kettle is naturally cooled to room temperature, take out the surface growth cobalt molybdate mesh nanosheet array The foamed nickel is washed with deionized water and dried at 50℃;

[0051] Dissolve 0.06g of sucrose in 60mL of deionized water, transfer the resulting sucrose solution into a 100mL polytetrafluoroethylene reactor, and immerse the foamed nickel on the surface of the cobalt molybdate mesh nanosheet array in the sucrose solution, and react After the kettle is airtight, it is put into a blast drying box and heated to 110°C for 6h. After the kettle is naturally cooled to room temperature, take ou...

Embodiment 3

[0055] Dissolve 1.222g cobalt nitrate and 1.016g sodium molybdate in 60mL deionized water, transfer the resulting mixed solution into a 100mL polytetrafluoroethylene reactor, and place 2×2cm 2 Dip the foamed nickel into the mixed solution in the reaction kettle, seal the reaction kettle and put it in a blast drying box and heat it to 130°C for 4 hours. After the reaction kettle is naturally cooled to room temperature, take out the cobalt molybdate net-like nanosheet array grown on the surface The foamed nickel is washed with deionized water and dried at 70℃;

[0056] Dissolve 0.237g glucose in 60mL deionized water, transfer the resulting glucose solution into a 100mL polytetrafluoroethylene reactor, immerse the nickel foam on the surface of the cobalt molybdate mesh nanosheet array in the glucose solution, and react After the kettle is airtight, it is put into a blast drying box and heated to 130°C for 4h. After the reaction kettle is naturally cooled to room temperature, the gluc...

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Abstract

The invention discloses a carbon-coated cobalt molybdate network nanosheet array material, which comprises a nano carbon film, cobalt molybdate network nanosheets and nickel foam, wherein the cobalt molybdate network nanosheets vertically grow on the nickel foam in an intersecting manner to form a cobalt molybdate network nanosheet array; and the nano carbon film coats the surface of the cobalt molybdate network nanosheet array. The invention further discloses a preparation method of the carbon-coated cobalt molybdate network nanosheet array material. The prepared carbon-coated cobalt molybdate network nanosheet array material can be used as an electrode material of a super-capacitor, so that the specific capacitance and the cycle performance of the super-capacitor can be significantly improved. The method is simple, short in time, green, environment-friendly, low in cost and suitable for industrialized massive production.

Description

Technical field [0001] The invention relates to a preparation method of a carbon-coated cobalt molybdate mesh nano-sheet array material, which belongs to the field of preparation of supercapacitor electrode materials. Background technique [0002] Supercapacitor, also known as electrochemical capacitor, is a new type of energy storage device between traditional capacitors and batteries. It has a higher energy density than traditional capacitors, a higher power density than secondary batteries, and it also has a charge The advantages of short discharge time, high charge and discharge efficiency, long cycle life, no memory effect, and basically maintenance-free. It has important and broad application prospects in mobile communications, information technology, consumer electronics, electric vehicles, aerospace and defense technology, etc. , Has become a research hotspot in countries all over the world. [0003] According to the different charge storage mechanisms of electrode materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/86B82Y30/00B82Y40/00
CPCY02E60/13H01G11/30B82Y30/00B82Y40/00H01G11/36H01G11/86
Inventor 严微微
Owner CHINA JILIANG UNIV
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