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Asymmetric supercapacitor adding potassium ferricyanide and p-phenylenediamine to dipolar electrolyte and preparation method

A supercapacitor, potassium ferricyanide technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc., to achieve the effects of high utilization, large specific surface area, and high energy density

Inactive Publication Date: 2015-02-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These emerging energy sources have their own characteristics, are green and environmentally friendly, and have huge reserves, but there are great limitations in the adaptation and supporting use of these energy sources with the grid system

Method used

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  • Asymmetric supercapacitor adding potassium ferricyanide and p-phenylenediamine to dipolar electrolyte and preparation method
  • Asymmetric supercapacitor adding potassium ferricyanide and p-phenylenediamine to dipolar electrolyte and preparation method
  • Asymmetric supercapacitor adding potassium ferricyanide and p-phenylenediamine to dipolar electrolyte and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) by 1cm 2 Carbon paper as the substrate, soaked in acetone for 2 hours, then ultrasonicated for 30 minutes; soaked in hydrochloric acid for 2 hours, then ultrasonicated for 30 minutes; soaked in deionized water for 2 hours, then ultrasonicated for 30 minutes. Cobalt hydroxide / carbon paper electrode was prepared by constant potential electrochemical deposition method. In the electrochemical deposition method, the concentration of cobalt nitrate was 1.2mol / L, the deposition time was 1h, the deposition potential was -0.9V, and the temperature was 45°C. The active substance mass is 5.13 mg.

[0038] (2) Mix activated carbon, conductive graphite and Nafion solution according to the mass ratio of 85:10:5, 2 Nickel foam was used as the substrate and collector, and the nickel foam / activated carbon electrode was prepared by scraping method, and the mass of the active material was 7.81 mg.

[0039] (3) In 1mol / L KOH solution, the above electrodes were tested by cyclic voltam...

Embodiment 2

[0043] (1) Same as Embodiment 1 (1).

[0044] (2) is the same as Embodiment 1 (2).

[0045] (3) is the same as Embodiment 1 (3).

[0046] (4) The 1mol / L KOH electrolyte in the implementation example 1 (4) is replaced, and the ion exchange membrane is used as a diaphragm, and the positive electrode is injected with 25ml 1mol / L KOH and 0.05mol / L K 3 Fe(CN) 6 The mixed solution of 25ml 1mol / L KOH and 0.025mol / L PPD is injected into the negative electrode to form a bipolar chamber with different electrolytes and an electrode area of ​​1cm 2 A novel cobalt hydroxide-activated carbon asymmetric supercapacitor.

[0047] (5) Using cyclic voltammetry (such as figure 2 Shown) and charging and discharging methods to test the capacitive properties of the above-mentioned novel asymmetric supercapacitor. When the charge and discharge current density is 5mA / cm 2 , the specific capacitance and energy density of the supercapacitor were 175F / g and 63Wh / kg, respectively.

Embodiment 3

[0049] (1) Same as Embodiment 1 (1).

[0050] (2) is the same as Embodiment 1 (2).

[0051] (3) is the same as Embodiment 1 (3).

[0052] (4) The 1mol / L KOH electrolyte in the implementation example 1 (4) is replaced, and the ion-exchange membrane is used as a diaphragm, and the positive electrode is injected with 25ml 1mol / L KOH and 0.1mol / L KOH 3 Fe(CN) 6 The mixed solution of 25ml 1mol / L KOH and 0.05mol / L PPD is injected into the negative electrode to form a bipolar chamber with different electrolytes and an electrode area of ​​1cm 2 A novel cobalt hydroxide-activated carbon asymmetric supercapacitor.

[0053] (5) Using cyclic voltammetry (such as figure 2 Shown) and charging and discharging methods to test the capacitive properties of the above-mentioned novel asymmetric supercapacitor. When the charge and discharge current density is 6mA / cm 2 , the specific capacitance and energy density of the asymmetric supercapacitor are 350F / g and 125Wh / kg, respectively.

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Abstract

The invention relates to an asymmetric supercapacitor adding potassium ferricyanide and p-phenylenediamine to dipolar electrolyte and a preparation method. An anode is made of carbon material / cobalt hydroxide electrode, and a cathode is made of nickel foam or carbon material / activated carbon electrode. The electrolyte is aqueous alkaline solution and separates the positive pole chamber and the negative pole chamber by using the ion exchange membrane, and the positive electrolyte and the negative electrolyte are respectively added the potassium ferricyanide and the p-phenylenediamine. The energy storage device can realize the organic combination of supercapacitor and flow batteries, and the electrodes in the same supercapacitor can not only be used as a conductor of electronic transmission, but also contribute to a double-layer capacitance or pseudo capacitance. The electrolyte can transmit ions, and can store and release changes, so that the specific capacitance and the energy density are significantly improved. The capacitor can be assembled in the form of superposition, that is, a plurality of supercapacitors are connected in series and / or in parallel to form supercapacitor groups, or multiple groups of supercapacitor in series and parallel, thereby achieving the required voltage and current.

Description

technical field [0001] The invention relates to a kind of electrolytic solution of two poles respectively adding potassium ferricyanide (K 3 Fe(CN) 6 ) and p-phenylenediamine (PPD) novel asymmetric supercapacitors. The positive electrode uses different carbon materials / cobalt hydroxide electrodes, the negative electrode uses nickel foam or different carbon materials / activated carbon electrodes, the electrolyte is alkaline aqueous solution, and a certain concentration of potassium ferricyanide is added to the positive electrode electrolyte, and a certain concentration For p-phenylenediamine, an ion exchange membrane is used to separate the positive and negative chamber electrolyte. It specifically involves the preparation of different carbon materials / cobalt hydroxide electrodes and nickel foam or different carbon materials / activated carbon electrodes, the capacity matching of positive and negative electrodes of asymmetric supercapacitors, and the concentration of redox speci...

Claims

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Application Information

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IPC IPC(8): H01G11/64H01G11/38H01G11/84H01G11/86
CPCY02E60/13H01G11/64H01G11/38H01G11/84H01G11/86
Inventor 郑伟涛王浩翔王家富史晓媛张恒彬
Owner JILIN UNIV
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