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Preparation method of manganese dioxide composite electrode for supercapacitor

A technology of supercapacitors and manganese dioxide, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve problems such as differences in electrochemical performance, and achieve the effect of overcoming the use of conductive agents and binders

Inactive Publication Date: 2018-08-21
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MnO prepared by different methods 2 There are differences in lattice structure, surface morphology and specific surface area, resulting in large differences in electrochemical performance.

Method used

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  • Preparation method of manganese dioxide composite electrode for supercapacitor
  • Preparation method of manganese dioxide composite electrode for supercapacitor
  • Preparation method of manganese dioxide composite electrode for supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First cut the 1.5 mm thick nickel foam into a rectangular strip of 2 cm × 4 cm, ultrasonicate for 10 min with an acetone solution added with about 10% carbon tetrachloride to remove the surface oil, and then mix it with 4 mol / L hydrochloric acid and oxalic acid Sonicate the pickling solution for 8 minutes. Rinse with deionized water after ultrasonication, then ultrasonically clean with absolute ethanol and deionized water for 10 min, repeat twice to ensure that the oxide layer and pickling solution on the surface are completely removed, and store in absolute ethanol. Afterwards, the nickel foam after the pretreatment is put into vacuum oven, 60 o Dry at C for 3 h, take out the silver-gray nickel foam and place it obliquely in an 80 mL reaction kettle; prepare 0.05 mol / L potassium permanganate, take out 50 mL of the above potassium permanganate solution with a beaker, and add boric acid to it to adjust The pH value is 5.5, stirred for 1 h, then ultrasonically mixed for ...

Embodiment 2

[0038] First cut the 1.5 mm thick nickel foam into a square of 4 cm × 4 cm, ultrasonicate it with an acetone solution with about 10% carbon tetrachloride for 15 minutes to remove the surface oil, and then pickle it with a mixture of 3 mol / L hydrochloric acid and oxalic acid Liquid sonication for 10min. Rinse with deionized water after ultrasonication, then ultrasonically clean with absolute ethanol and deionized water for 10 min, repeat twice to ensure that the oxide layer and pickling solution on the surface are completely removed, and store in absolute ethanol. Afterwards, the nickel foam after the pretreatment is put into vacuum oven, 60 o Dry at C for 3 hours, take out the silver-gray nickel foam and place it in an 80 mL reaction kettle at an angle; prepare 0.05 mol / L potassium permanganate, take out 50 mL of the above potassium permanganate solution with a beaker, and add NaOH to it to adjust the pH value is 7.8, stirred for 1 h, then ultrasonically mixed for 30 min and ...

Embodiment 3

[0042] First, the 1.2 mm thick nickel foam was cut into a 3cm×3cm square, and the acetone solution added with about 10% carbon tetrachloride was sonicated for 10 minutes to remove surface oil, and then 3 mol / L oxalic acid solution was sonicated for 10 minutes. Rinse with deionized water after ultrasonication, then ultrasonically clean with absolute ethanol and deionized water for 10 min, repeat twice to ensure that the oxide layer and pickling solution on the surface are completely removed, and store in absolute ethanol. Afterwards, the nickel foam after the pretreatment is put into vacuum oven, 60 o Dry at C for 3 h, take out the silver-gray nickel foam and place it obliquely in an 80 mL reaction kettle; prepare 0.1 mol / L potassium permanganate, take out 50 mL of the above potassium permanganate solution with a beaker, and add boric acid to it to adjust The pH value was 5.2, stirred for 1 h, then ultrasonically mixed for 30 min, then poured into the reaction kettle, and final...

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Abstract

The invention discloses a preparation method of a manganese dioxide composite material electrode for a supercapacitor. According to the preparation method, delta-type manganese dioxide is directly deposited on foam nickel through using one-step hydrothermal method; a modified layer of graphene quantum dots, carbon quantum dots or PbO2 is deposited on the surface of the manganese dioxide through using an electrodeposition technique, so that the composite material electrode can be prepared. The prepared electrode has the advantages of excellent electrochemical performance, simple operation and easiness in condition control.

Description

technical field [0001] The invention relates to a preparation method of a supercapacitor electrode material, in particular to a preparation method of a manganese dioxide composite electrode for a supercapacitor. Background technique [0002] Supercapacitor (supercapacitor, ultracapacitor), also known as Electrochemical Capacitor (EC), gold capacitor, Faraday capacitor; energy storage. It is an electrochemical element, but no chemical reaction occurs in the process of its energy storage. This energy storage process is reversible, and it is precisely because this supercapacitor can be repeatedly charged and discharged hundreds of thousands of times. A supercapacitor can be viewed as two non-reactive porous electrode plates suspended in an electrolyte. When electricity is applied to the plates, the positive plate attracts negative ions in the electrolyte, and the negative plate attracts positive ions, effectively forming two capacitive storage layer, the separated positive io...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/46H01G11/86
CPCY02E60/13
Inventor 杨慧敏李加刚刘宪杜海燕代红艳简选梁镇海
Owner TAIYUAN UNIV OF TECH
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