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Method for synthesizing cobalt molybdate for supercapacitor electrode material

A technology for supercapacitors and synthesis methods, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of low specific capacitance and limited applications, and achieve reduced surface tension, low raw material costs, and reduced agglomeration Effect

Inactive Publication Date: 2019-06-25
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current electrode materials prepared from binary transition metal oxides have low specific capacitance values, which limits their application in supercapacitor electrode materials.

Method used

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  • Method for synthesizing cobalt molybdate for supercapacitor electrode material
  • Method for synthesizing cobalt molybdate for supercapacitor electrode material
  • Method for synthesizing cobalt molybdate for supercapacitor electrode material

Examples

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preparation example 1

[0032] In the synthetic method of the cobalt molybdate that is used for supercapacitor electrode material of this example, at first, cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and deionized water are mixed and dissolved at 0.002:1 according to the ratio of substances to obtain solution A, and then the morphology regulator ammonium fluoride, sodium molybdate (Na 2 MoO 4 ) and deionized water were mixed and dissolved according to the mass ratio of 0.001:0.002:1, and then the acid-base regulator tripotassium phosphate was added to adjust to neutrality to obtain solution B. Then solution A and solution B were mixed in equal volumes and subjected to precipitation reaction. The reaction temperature was 25° C., and the reaction time was 2 hours. After the reaction was completed, it was cooled and washed three times by deionized water and ethanol, respectively, and finally in a vacuum of Under the conditions of 0.8KPa and 60°C, vacuum drying was carried out for 10 hours to obtain ...

preparation example 2

[0035] In the synthetic method of the cobalt molybdate that is used for supercapacitor electrode material of the present example, at first, cobalt nitrate (Co(NO 3 ) 2 ) and deionized water are mixed and dissolved at a ratio of 0.003:1 to obtain solution A, and then the morphology regulator sodium lauryl sulfate, ammonium molybdate ((NH 4 ) 2 MoO 4 ) and deionized water were mixed and dissolved according to the mass ratio of 0.001:0.003:1, and then an acid-base regulator potassium citrate was added to adjust to neutrality to obtain solution B. Then solution A and solution B were mixed in equal volumes to carry out precipitation reaction. The reaction temperature was 40°C and the reaction time was 6 hours. After the reaction was completed, it was cooled and washed three times by centrifugation with deionized water and ethanol. Under the conditions of 0.8KPa and 60°C, vacuum drying was carried out for 10 hours to obtain cobalt molybdate.

[0036] The cobalt molybdate electrode...

preparation example 3

[0038] In the synthetic method of the cobalt molybdate that is used for supercapacitor electrode material of this example, at first, cobalt bromide (CoBr 2 ) and deionized water are mixed and dissolved at a ratio of 0.003:1 to obtain solution A, and then the morphology regulator hexadecyltrimethylammonium bromide, nickel molybdate (NiMoO 4 ) and deionized water were mixed and dissolved according to the mass ratio of 0.002:0.004:1, and then the acid-base regulator sodium citrate was added to adjust to neutrality to obtain solution B. Then, solution A and solution B were mixed in equal volumes and subjected to precipitation reaction. The reaction temperature was 80° C., and the reaction time was 8 hours. After the reaction was completed, it was cooled and washed three times by deionized water and ethanol, respectively, and finally in a vacuum of Under the conditions of 0.8KPa and 60°C, vacuum drying was carried out for 10 hours to obtain cobalt molybdate.

[0039] The cobalt mo...

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Abstract

The invention provides a method for synthesizing cobalt molybdate for a supercapacitor electrode material. The synthesizing method comprises steps of s1, mixing and dissolving a cobalt salt and deionized water to obtain a solution A; s2, mixing and dissolving a shape modifier, molybdate and deionized water, and then adding an acid-base modifier to adjust the mixture to be neutral to obtain a solution B; and s3, mixing the solution A and the solution B having the same volume for a precipitation reaction, and cooling the mixed solution after the precipitation reaction is completed, and washing and drying and the mixed solution to obtain the cobalt molybdate. The method for synthesizing the cobalt molybdate, by means of the characteristic that the molybdate has various oxidation statess and low-point conversion reactions, uses the cobalt molybdate obtained by combining the cobalt salt with the molybdate as a capacitor electrode material so as to achieve high reversibility and excellent cycle performance and stability. The prepared cobalt molybdate is a petal-like sheet structure and has large specific surface area, so that the specific capacitance of a capacitor can be greatly increased and good electrochemical performance can be achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of capacitor electrode materials, in particular to a method for synthesizing cobalt molybdate used for supercapacitor electrode materials. Background technique [0002] As a new type of energy storage device, supercapacitors have the advantages of high power density and long charging and discharging time. As the main evaluation standard of supercapacitors, the selection of electrode materials for supercapacitors is also particularly important. The types of supercapacitor electrode materials mainly include metal cadmium compounds, metal oxides and binary transition metal oxides. However, due to the shortcomings of metal cadmium compounds and metal oxides in terms of stability and capacitance performance, more and more People began to focus on binary transition metal oxides. However, the current electrode materials prepared from binary transition metal oxides have low specific capacitance value...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/86
CPCY02E60/13
Inventor 赵莹魏婷梁立南张向京
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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