Film for graphene/porous nickel oxide composite super capacitor and preparation method thereof

A supercapacitor, graphene technology, applied in the direction of capacitor electrodes, capacitor parts, etc., can solve the problems of unsatisfactory practical application, unsatisfactory cycle stability, etc., and achieve excellent high-rate performance, increase contact area, and charge and discharge capacity. high effect

Inactive Publication Date: 2011-04-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Transition metal oxide-based capacitors are faradaic pseudocapacitors. The charge storage process not only includes storage on the electric double layer, but also stores energy through rapid redox reactions on the electrodes, resulting in a much higher specific capacitance than carbon-based materials (up to carbon 3 to 7 times that of materials), but the cycle stability of such materials is not ideal (5 times), can not meet the practical application

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  • Film for graphene/porous nickel oxide composite super capacitor and preparation method thereof
  • Film for graphene/porous nickel oxide composite super capacitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Weigh 5 g of graphite oxide flakes and add them to 1000 mL of isopropanol solution, then add 0.05 g of magnesium nitrate, and ultrasonicate for 30 minutes to form a stable pale yellow graphite oxide flake sol as the electrolyte. Then the electrolyte was transferred to an electrochemical double-electrode system, in which nickel foam was used as the working electrode, and the optical platinum sheet was used as the auxiliary electrode. The applied voltage is 100V, and the reaction is 30s to obtain graphite oxide film. Then place the graphite oxide film in saturated hydrazine hydrate vapor at 60°C for 12 hours to form a graphene film with a film thickness of 10 nm.

[0019] Weigh 120g of nickel sulfate and 20g of potassium persulfate into a beaker, then add 1000mL of deionized water and stir until completely dissolved. Afterwards, the graphene film supported by nickel foam was vertically pasted on the wall of the beaker, with the conductive surface facing the solution, and...

Embodiment 2

[0021] Weigh 20g graphite oxide flakes and add them to 2000mL isopropanol solution, then add 0.2g magnesium nitrate, and ultrasonicate for 30min to form a stable pale yellow graphite oxide flake sol as electrolyte. Then the electrolyte was transferred to an electrochemical double-electrode system, in which nickel foam was used as the working electrode, and the optical platinum sheet was used as the auxiliary electrode. The applied voltage was 50V, and the reaction was performed for 5 minutes to obtain a graphite oxide flake film. Then place the graphite oxide film in saturated hydrazine hydrate vapor at 75°C for 12 hours to form a graphene film with a film thickness of 50 nm.

[0022] Weigh 240g of nickel sulfate and 40g of potassium persulfate respectively and place them in a beaker, then add 2500mL of deionized water and stir until completely dissolved. Afterwards, the graphene film supported by nickel foam was vertically pasted on the wall of the beaker, with the conductiv...

Embodiment 3

[0024] Weigh 40g of graphite oxide flakes and add them to 2500mL of isopropanol solution, then add 0.4g of magnesium nitrate, and ultrasonicate for 30min to form a stable pale yellow graphite oxide flake sol as the electrolyte. Then the electrolyte was transferred to an electrochemical double-electrode system, in which nickel foam was used as the working electrode, and the optical platinum sheet was used as the auxiliary electrode. The applied voltage was 150V, and the reaction was performed for 5 minutes to obtain a graphite oxide flake film. Then place the graphite oxide film in saturated hydrazine hydrate vapor at 90 °C for 12 h to form a graphene film with a thickness of 100 nm.

[0025] Weigh 480g of nickel sulfate and 80g of potassium persulfate respectively and place them in a beaker, then add 4000mL of deionized water and stir until completely dissolved. Afterwards, the graphene film supported by nickel foam was vertically pasted on the wall of the beaker, with the co...

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Abstract

The invention discloses a film for a graphene/porous nickel oxide composite super capacitor. The invention is characterized in that the film is of a disordered nano porous structure, the aperture range is 10 to 350nm, the thickness of the film is 1 to 5 mu m, and the weight ratio of graphene to nickel oxide is (0.5:100) to (2:100). The method for preparing the film comprises the following steps: dissolving graphite oxide sheets and magnesium nitrate into an isopropanol solution so as to form a positively-charged graphite oxide sheet sol, then carrying out electrophoretic deposition on the obtained sol so as to obtain a graphene film; and through taking the graphene film as a deposition carrier, preparing a three-dimensional porous film for the graphene/porous nickel oxide composite super capacitor by using a chemical bath film-coating method. The porous composite thin film prepared by the method has the advantages of good mechanical capacity and super-capacitance property, high-discharge specific capacitance, high-ratio charge-discharge properties, high cycle life and the like, and has wide application prospects in the fields such as electric automobiles, communication, consumer electronics, signal control and the like.

Description

technical field [0001] The invention relates to a carbon material and transition metal compound composite supercapacitor film and a preparation method thereof, in particular to a graphene / porous nickel oxide composite supercapacitor film and a preparation method thereof. Background technique [0002] Supercapacitor is a high-energy, green energy storage device with performance between batteries and traditional capacitors. It has the advantages of high power density, fast charge and discharge speed, long cycle life and wide operating temperature range. It is used in electric vehicles, communications, electronics It has broad application prospects in fields such as consumption and signal control. Electrode materials are the core components of supercapacitors, and their performance directly determines the quality of the overall device. With the expansion and deepening of the application field of supercapacitors, it is particularly urgent to research and develop electrode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/04
CPCY02E60/13
Inventor 涂江平夏新辉麦永津王秀丽谷长栋
Owner ZHEJIANG UNIV
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