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Cobalt molybdate/carbon composite nanosphere, preparation method and application as electrode material

A nanosphere and carbon composite technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of unfavorable energy density of supercapacitors, reduce the quality of active materials, and poor conductivity of electrode materials, etc., and achieve simple operation process Environmental protection, process safety, high conductivity effect

Active Publication Date: 2019-11-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patents 201610822600.5 and 201810171628.6 use nickel foam as a carrier to prepare cobalt molybdate nanosheet arrays and cobalt molybdate films, respectively, which improve the specific capacitance and cycle performance of supercapacitors, but the use of foam nickel reduces the quality of active materials. It is not conducive to the improvement of the energy density of supercapacitors
Chinese invention patent 201910209251.3 discloses a cobalt molybdate with a petal-shaped lamellar structure, which has a large specific surface area and improves the specific capacity of the supercapacitor, but the preparation process of the petal-shaped cobalt molybdate is complicated, the energy consumption is high, and the structure Unstable, easy to collapse, and the conductivity of the electrode material is still poor

Method used

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  • Cobalt molybdate/carbon composite nanosphere, preparation method and application as electrode material
  • Cobalt molybdate/carbon composite nanosphere, preparation method and application as electrode material
  • Cobalt molybdate/carbon composite nanosphere, preparation method and application as electrode material

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Experimental program
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Effect test

Embodiment 1

[0029] 1) preparation concentration is the cobalt chloride aqueous solution of 0.03mol / L, the sodium molybdate aqueous solution of preparation 0.04mol / L;

[0030] 2) Mix cobalt chloride aqueous solution and sodium molybdate aqueous solution with a volume ratio of 1:3, ultrasonicate for 10 minutes, and stir for 10 hours. After the reaction is completed, product A is obtained by suction filtration, washing and drying;

[0031] 3) ultrasonically disperse 30 mg of product A in 150 mL of 2-hydroxyacetanilide aqueous solution with a concentration of 0.03 mol / L, stir at room temperature for 10 h, filter, wash, and dry to obtain product B;

[0032] 4) Calcining the product B at 600° C. for 2 h under a nitrogen atmosphere to obtain cobalt molybdate-carbon composite nanospheres.

[0033] see figure 1 , figure 1 The scanning electron microscope picture of the cobalt molybdate-carbon composite nanosphere prepared for the present invention; it can be seen from the picture that the spheri...

Embodiment 2

[0037] 1) preparation concentration is the cobalt nitrate aqueous solution of 0.01mol / L, the ammonium molybdate aqueous solution of preparation 0.02mol / L;

[0038] 2) Mix cobalt nitrate aqueous solution and ammonium molybdate aqueous solution with a volume ratio of 1:1, and ultrasonicate for 5 minutes, then stir for 7 hours. After the reaction is completed, filter, wash, and dry to obtain a cobalt molybdate intermediate, which is designated as product A;

[0039] 3) ultrasonically disperse 20 mg of product A in 100 mL of 3-(dibutylamino)phenol aqueous solution with a concentration of 0.01 mol / L, stir at room temperature for 7 hours, filter, wash and dry to obtain product B;

[0040] 4) Calcining the product B at 400° C. for 2 h under an argon atmosphere to obtain cobalt molybdate-carbon composite nanospheres.

Embodiment 3

[0042] 1) preparation concentration is the cobalt acetate aqueous solution of 0.02mol / L, the sodium molybdate aqueous solution of preparation 0.03mol / L;

[0043]2) Sonicate the cobalt acetate aqueous solution and sodium molybdate aqueous solution with a volume ratio of 1:2 for 7 minutes, and then stir for 9 hours. After the reaction is completed, the product A is obtained by suction filtration, washing and drying;

[0044] 3) Ultrasonic disperse 20 mg of product A in 100 mL of 4-(2-aminoethyl)-1,2-benzenediol aqueous solution with a concentration of 0.02 mol / L, stir for 9 hours at normal temperature and pressure, filter and wash , obtain product B after drying;

[0045] 4) Calcining the product B at 500° C. for 2 h under an argon atmosphere to obtain cobalt molybdate-carbon composite nanospheres.

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Abstract

The invention discloses a cobalt molybdate / carbon composite nanosphere, a preparation method and an application as an electrode material, which belong to the field of composite synthesis. According tothe preparation method of the cobalt molybdate / carbon composite nanosphere of the invention, a cobalt molybdate nanostructure is cut at room temperature by using the coordination between an aminophenol derivative and a cobalt molybdate precursor, and a special nanosphere structure is formed finally. The preparation method overcomes the disadvantages of the existing cobalt molybdate nanosphere preparation method, such as complex process and harsh conditions. The preparation method is safe, consumes less energy, has a simple operation process and is environment-friendly. The composite has the characteristics of small size, stable structure and high conductivity.

Description

technical field [0001] The invention belongs to the field of composite synthesis, in particular to a cobalt molybdate-carbon composite nanosphere, a preparation method and its application as an electrode material. Background technique [0002] Supercapacitors have the characteristics of long service life, low maintenance and repair costs, and high power density, and are an important supplement to secondary batteries. However, the low energy density of supercapacitors limits their further applications. As an important inorganic nano-functional material, cobalt molybdate can provide high energy density for supercapacitors. Chinese invention patent 201110048928.3 discloses a method for preparing manganese molybdate / cobalt molybdate hierarchical heterostructure nanowires. First, manganese molybdate nanorods are prepared by microemulsion method, and then refluxed in aqueous solution, and cobalt chloride and Sodium molybdate, after the reaction, manganese molybdate / cobalt molybd...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/86
CPCH01G11/24H01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 张利锋宋一飞查通赵丹刘毅郭守武
Owner SHAANXI UNIV OF SCI & TECH
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