Asymmetric supercapacitor with potassium ferricyanide and potassium ferrocyanide added to two electrode chambers respectively and preparation method thereof

A supercapacitor and potassium ferrocyanide technology, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor separators, etc., can solve problems such as unfavorable capacitor performance, low solubility, and increased self-discharge. Achieve excellent cycle stability, high solubility, and improved capacitance performance

Active Publication Date: 2015-04-29
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for ion exchange membranes, it is difficult to avoid the penetration of phenylenediamine by neutral organic molecules, and its self-discharg

Method used

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  • Asymmetric supercapacitor with potassium ferricyanide and potassium ferrocyanide added to two electrode chambers respectively and preparation method thereof
  • Asymmetric supercapacitor with potassium ferricyanide and potassium ferrocyanide added to two electrode chambers respectively and preparation method thereof
  • Asymmetric supercapacitor with potassium ferricyanide and potassium ferrocyanide added to two electrode chambers respectively and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0043] Implementation example 1:

[0044] (1) Use an area of ​​1cm 2 Carbon paper was used as the base, soaked in acetone, ethanol, and deionized water for 2 hours, and then ultrasonicated for 30 minutes. Carbon paper / cobalt hydroxide electrodes were prepared by potentiostatic electrodeposition. During the electrochemical deposition process, 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.

[0045] (2) Use an area of ​​1cm 2 Nickel foam was used as the substrate, soaked in acetone, ethanol, and deionized water for 2 hours, and then ultrasonicated for 30 minutes. Nickel foam / activated carbon electrodes were prepared by doctor blade method. Mix activated carbon, conductive graphite and Nafion solution evenly in a mass ratio of 85:10:5, and scrape them on the nickel foam.

[0046] (3) The supercapacitor diaphragm ion exchange membrane is treated, specifically, the volume fraction o...

Example Embodiment

[0049] Implementation example 2:

[0050] (1) Use an area of ​​100cm 2 Carbon paper was used as the base, soaked in acetone, ethanol, and deionized water for 2 hours, and then ultrasonicated for 30 minutes. Carbon paper / cobalt hydroxide electrodes were prepared by potentiostatic electrodeposition. During the electrochemical deposition process, 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.

[0051] (2) Use an area of ​​100cm 2 Nickel foam was used as the substrate, soaked in acetone, ethanol, and deionized water for 2 hours, and then ultrasonicated for 30 minutes. Nickel foam / activated carbon electrodes were prepared by doctor blade method. Mix activated carbon, conductive graphite and Nafion solution evenly in a mass ratio of 85:10:5, and scrape them on the nickel foam.

[0052] (3) The supercapacitor diaphragm ion exchange membrane is treated, specifically, the volume fracti...

Example Embodiment

[0054] (5) The carbon paper / cobalt hydroxide electrode was used as the positive electrode, the nickel foam / activated carbon electrode was used as the negative electrode, and the modified polypropylene film was used as the diaphragm to assemble an asymmetric supercapacitor, and 1mol / L KOH solution was added as the electrolyte. When the current density is 1mA / cm 2 , the specific capacitance and energy density of the asymmetric supercapacitor are 77.2 F / g and 27.4 Wh / kg, respectively. (like Image 6 Shown in (a)) implementation example 3:

[0055] (1) Same as Embodiment 2 (1).

[0056] (2) is the same as Embodiment 2 (2).

[0057] (3) is the same as Embodiment 2 (3).

[0058] (4) The carbon paper / cobalt hydroxide electrode is used as the positive electrode, the nickel foam / activated carbon electrode is used as the negative electrode, and the ion exchange membrane is used as the diaphragm, and 50ml of 1mol / L KOH and 0.05mol / L KOH are injected into the positive electrode. 3 Fe...

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Abstract

The invention relates to an asymmetric supercapacitor with potassium ferricyanide and potassium ferrocyanide added to two electrode chambers respectively and a preparation method of the asymmetric supercapacitor. According to the asymmetric supercapacitor and the preparation method of the asymmetric supercapacitor, the potassium ferricyanide is added to the positive electrode chamber, the potassium ferrocyanide is added to the negative electrode chamber, and the positive electrode chamber and the negative electrode chamber are separated by an ion exchange membrane and assembled into a single supercapacitor or a multi-body supercapacitor bank. Solid electrodes and liquid electrolyte provide capacitance simultaneously to achieve organic combination of the supercapacitor and a flow battery. The positive electrode of the capacitor achieves pseudocapacitance overlapping of cobaltous hydroxide and the potassium ferricyanide; the negative electrode of the capacitor achieves pseudocapacitance overlapping of an activated carbon electrical double-layer capacitor and the potassium ferrocyanide. Thus, the asymmetric supercapacitor has quite high energy density. In the negative electrode chamber, K4Fe(CN)6 is selected as a reducing agent, so self discharge is reduced, and the stability of the capacitive performance of the capacitor is improved.

Description

Technical field: [0001] The invention belongs to the technical field of chemical power sources, in particular to the aspect of asymmetric supercapacitors, and specifically relates to adding potassium ferricyanide (K 3 Fe(CN) 6 ) and potassium ferrocyanide (K 4 Fe(CN) 6 ) asymmetric supercapacitor and preparation method thereof. Background technique: [0002] The excessive use of traditional energy materials has caused serious environmental pollution problems. Sustainable development and utilization of clean energy is imperative. Energy and the environment have become major issues facing mankind in the 21st century. Supercapacitors have the advantages of high power density, green environmental protection, long service life, and good temperature characteristics. Using them as starting power supplies can ensure the smooth start of high-power military devices, and they can also be used as vehicle traction energy for electric vehicles. , rail cars, etc. Using supercapacitors...

Claims

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Application Information

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IPC IPC(8): H01G11/64H01G11/30H01G11/52H01G11/86H01G11/84
CPCY02E60/13H01G11/64H01G11/30H01G11/52H01G11/84H01G11/86
Inventor 郑伟涛王浩翔田宏伟王家富张彩李迁
Owner JILIN UNIV
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