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Energy storage system of modified carbon-based electrode cooperating with redox electrolyte

A technology of synergistic oxidation and electrolyte, applied in the field of electrochemical energy storage, can solve the problems of non-commercial application and low specific capacity, and achieve the effect of low cost, high cost advantage and simple process

Inactive Publication Date: 2020-05-05
江苏第二师范学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, it has been proposed to combine redox additives with carbon-based materials with good conductivity to enhance redox pair electron conductivity, and some progress has been made, but most of the reported specific capacities are too low for practical commercial applications. application

Method used

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  • Energy storage system of modified carbon-based electrode cooperating with redox electrolyte
  • Energy storage system of modified carbon-based electrode cooperating with redox electrolyte
  • Energy storage system of modified carbon-based electrode cooperating with redox electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The energy storage system with synergistic effect is constructed by electrochemical oxidation treatment of carbon nanotube electrodes and sodium sulfate aqueous solution containing potassium ferricyanide. The specific operation steps are as follows:

[0032] The carbon nanotube electrode was placed in a mixed solution (volume ratio 1:1) of concentrated sulfuric acid (98% by mass fraction) and concentrated nitric acid (68% by mass fraction) for full infiltration, and electrochemical oxidation was performed at a voltage of 3V. The processing time was 4 minutes. Electron microscope images of processed carbon nanotubes as figure 1 shown. Wash and dry the treated electrodes with clean water. Electrochemical test is carried out to electrode then, and electrolytic solution is the 1M sodium sulfate solution containing 0.06M potassium ferricyanide, and the voltage interval of cyclic voltammetry test is-0.1-0.8V, and scan rate is 5-200mV, and obtained result is as follows fig...

Embodiment 2

[0034] A synergistic energy storage system constructed by electrochemical oxidation treatment of carbon fiber electrodes and potassium nitrate aqueous solution containing hydroquinone.

[0035] The specific operation steps are as follows:

[0036] The carbon fiber electrode was placed in a mixed solution (volume ratio 1:2) of concentrated sulfuric acid (98% by mass fraction) and perchloric acid (70% by mass fraction) for full infiltration, and electrochemical oxidation was carried out at a voltage of 4V. The time is 15 minutes. Wash and dry the treated electrodes with clean water. Then the electrode is electrochemically tested, the electrolyte is 1M potassium nitrate solution containing 0.1M hydroquinone, the voltage range of the cyclic voltammetry test is 0-1V, and the scan rate is 5-200mV. According to the experimental results, the area specific capacity of the carbon fiber electrode at a scan rate of 5mV / s is as high as 1270mF / cm 2 .

Embodiment 3

[0038] An energy storage system with synergistic effect constructed by electrochemical oxidation treatment of activated carbon electrodes and sodium sulfate aqueous solution containing potassium p-ferricyanide. The specific operation steps are as follows:

[0039] The activated carbon electrode is placed in a mixed solution (volume ratio 2:1) of concentrated sulfuric acid (98% by mass fraction) and concentrated hydrochloric acid (36% by mass fraction) for full infiltration, and electrochemical oxidation is carried out at a voltage of 2V, and the treatment time is for 2 minutes. Wash and dry the treated electrodes with clean water. Then the electrode is electrochemically tested, the electrolyte is 0.5M sodium sulfate solution containing 0.05M potassium ferricyanide, the voltage range of the cyclic voltammetry test is -0.2-0.9V, and the scan rate is 5-200mV. According to the experimental results, the area specific capacity obtained by the activated carbon electrode at a scan r...

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Abstract

The invention relates to an energy storage system with a modified carbon-based electrode cooperating with a redox electrolyte. The energy storage system comprises the steps of 1 preparing an electrode, wherein a carbon-based material prepared through an electrochemical activation method in acid liquor serves as the electrode; and 2 constructing an energy storage system: carrying out electrochemical oxidation on the electrode prepared in the step 1 in an aqueous electrolyte. The activation method adopted by the invention is simple in process, low in cost, safe and environment-friendly, and theraw materials can be recycled. In the constructed energy storage system, the carbon-based electrode can show ultrahigh area specific capacitance, and has good rate capability and cycle life. The constructed energy storage system is safe and pollution-free, has the advantage of higher cost, and is beneficial to commercial application.

Description

technical field [0001] The invention relates to an energy storage system in which a modified carbon-based electrode cooperates with a redox electrolyte, and belongs to the technical field of electrochemical energy storage. Background technique [0002] High-performance energy storage devices are widely used in utility-scale grid services, hybrid electric vehicles, and consumer electronics. Among them, secondary batteries represented by lithium-ion batteries and carbon-based supercapacitors are favored by the market. The current research goal of energy storage devices is to achieve the combination of battery-level energy density, capacitor-level power density and long cycle life in a single device. [0003] At present, the electrodes of supercapacitors are mainly made of carbon-based materials, which is due to their ultra-high specific surface area, which is conducive to more electrostatic adsorption on the surface for charge storage. However, due to the surface properties o...

Claims

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Application Information

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IPC IPC(8): H01G11/32H01G11/62H01G11/84H01G11/86H01M4/583H01M4/62H01M10/0525
CPCH01G11/32H01G11/62H01G11/84H01G11/86H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 许翠霞陈琪花书贵赵浩宇
Owner 江苏第二师范学院
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