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Method for electrochemically preparing graphene/manganese dioxide composite material, and application of graphene/manganese dioxide composite material

A manganese dioxide and composite material technology, applied in the field of electrochemistry, can solve the problems of serious graphene agglomeration, serious environmental pollution, poor dispersibility of composite materials, etc., and achieve the effect of good reproducibility

Active Publication Date: 2012-07-11
JIANGSU SUNPOWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a new graphene / manganese dioxide composite material for the existing graphene / manganese dioxide composite material. Preparation method of manganese dioxide composite material

Method used

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  • Method for electrochemically preparing graphene/manganese dioxide composite material, and application of graphene/manganese dioxide composite material
  • Method for electrochemically preparing graphene/manganese dioxide composite material, and application of graphene/manganese dioxide composite material
  • Method for electrochemically preparing graphene/manganese dioxide composite material, and application of graphene/manganese dioxide composite material

Examples

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Embodiment 1

[0029] Put 10mg of graphite oxide into a beaker, add 100mL of deionized water and 1.2g of sodium carbonate, ultrasonically oscillate for 10 minutes, select a potential value of -0.9V, and perform constant potential electrolysis at a temperature of 0°C for 10 seconds, take out the electrode, and wash it with deionized water ,dry. Put the prepared graphene-modified electrode into an electrolytic cell containing 0.001mol / L manganese acetate, 0.01mol / L sodium sulfate and 1.0mol / L sulfuric acid solution, select a potential value of 0.9V and a temperature of 0°C for constant potential Electrolyze for 10 seconds, take out the electrode, wash with deionized water, and dry. Repeat the electrodeposition operation 100 times, use the obtained graphene / manganese dioxide composite material as the working electrode and counter electrode, and the acetocyanide solution of 0.1mol / L 1,3-dibutylimidazole tetrafluoroborate as the electrolyte Assembled with a supercapacitor, its capacitance is 155...

Embodiment 2

[0031] Put 10mg of graphite oxide into a beaker, add 200mL of deionized water and 2.0g of sodium carbonate, ultrasonically oscillate for 20 minutes, select a potential value of -1.0V, and perform constant potential electrolysis at a temperature of 20°C for 20 seconds, take out the electrode, and wash it with deionized water ,dry. Put the prepared graphene-modified electrode into an electrolytic cell containing 0.002mol / L manganese acetate, 0.02mol / L sodium sulfate and 0.5mol / L sulfuric acid solution, select a potential value of 0.9V and a temperature of 0°C for constant potential Electrolyze for 10 seconds, take out the electrode, wash with deionized water, and dry. Repeat the electrodeposition operation 100 times, use the obtained graphene / manganese dioxide composite material as the working electrode and the counter electrode, and the acetocyanide solution of 0.2mol / L1,3-dibutylimidazole tetrafluoroborate as the electrolyte assembly The supercapacitor has a capacitance of 12...

Embodiment 3

[0033] Put 10mg of graphite oxide into a beaker, add 200mL of deionized water, oscillate ultrasonically for 20 minutes, select the potential value of -0.9V, and perform constant potential electrolysis at 0°C for 10 seconds, take out the electrode, wash it with deionized water, and dry it. Put the prepared graphene-modified electrode into an electrolytic cell containing 0.002mol / L manganese sulfate, 0.06mol / L sodium sulfate and 0.2mol / L sulfuric acid solution, select a potential value of 1.2V and a temperature of 0°C for constant potential Electrolyze for 20 seconds, take out the electrode, wash with deionized water, and dry. Repeat the electrodeposition operation 100 times, use the obtained graphene / manganese dioxide composite material as the working electrode and the counter electrode, and the ethanol solution of 1.0mol / L 1,3-dibutylimidazole tetrafluoroborate as the electrolyte assembly The supercapacitor has a capacitance of 2710F / g, and after charging and discharging 1000 ...

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Abstract

The invention relates to a method for electrochemically preparing a graphene / manganese dioxide composite material, and application of the graphene / manganese dioxide composite material, and belongs to the technical field of electrochemistry. The method comprises the following steps of: taking sodium carbonate as a supporting electrolyte; reducing a graphene oxide into graphene by a controlled potential electrolysis method, and uniformly fixing the graphene on a surface of an electrode; and precisely controlling the thickness of a graphene coating layer according to the concentration of the graphene oxide, potential, temperature and time during electro-deposition; respectively taking manganese acetate and sodium sulfate as a manganese precursor and a supporting electrolyte; adjusting the acidity of the electrolyte by sulfuric acid, performing controlled potential electrolysis, electrically depositing manganese dioxide on the surface of the graphene, and precisely controlling the particle size and the distribution density of the manganese dioxide; and repeating the operation for 100 times, and preparing the graphene / manganese dioxide composite material. Test shows that the obtained graphene / manganese dioxide composite material is an electrode or a super assembly capacitor, in which ionic liquid is used as the electrolyte; the capacity is more than 500 F / g; and after the super assembly capacitor is cyclically charged and discharged for 1,000 times, the capacity can still be kept over 99 percent.

Description

technical field [0001] The invention relates to a method for electrochemically preparing a graphene / manganese dioxide composite material and an application thereof, belonging to the technical field of electrochemistry. Background technique [0002] Compared with traditional capacitors, supercapacitors have higher energy density and specific capacitance, and have higher power density than batteries, and their application prospects are very broad (Duan Liqian, Li Jingyin, Li Yupei, He Qianguo, Journal of Hebei University of Science and Technology, 2011, 32(2):169-172). In recent years, researchers have shown great interest in hybrid supercapacitors in order to improve the working voltage and specific energy of supercapacitors and expand their application range. Usually, the positive and negative electrodes of hybrid capacitors are composed of oxides and porous carbon that can produce Faradaic pseudocapacitance, and the use of overpotential complementarity can increase the ope...

Claims

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Application Information

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IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 李在均周琳婷牛玉莲严涛顾志国
Owner JIANGSU SUNPOWER
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