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Electrochemical preparation method of graphene/nickel-aluminum bimetal hydroxide composite material for super capacitor

A hydroxide and composite material technology, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of serious graphene agglomeration, poor dispersion of composite materials, environmental pollution, etc., and achieve obvious capacitance, good reproducibility, and improved The effect of conductivity

Active Publication Date: 2014-06-25
盐城市纺织染整产业园实业开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the shortcomings of existing graphene / nickel-aluminum double metal hydroxide composite materials such as serious environmental pollution, serious graphene agglomeration, large double metal hydroxide particle size, and poor dispersion of composite materials, and provides a Electrochemical Preparation of New Graphene / Double Metal Hydroxide Composites

Method used

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  • Electrochemical preparation method of graphene/nickel-aluminum bimetal hydroxide composite material for super capacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0024]Put 10mg of graphite oxide into a beaker, add 100mL of deionized water and 1.2g of potassium nitrate, 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 0.002mol / L nickel nitrate, 0.01mol / L aluminum nitrate and 0.01mol / L sodium sulfate. Potential electrolysis for 10 seconds, take out the electrode, wash with deionized water, and dry. Repeat the electrodeposition operation 100 times, use the obtained graphene / nickel-aluminum double metal hydroxide composite as the working electrode and the counter electrode, and use 6.0mol / L potassium hydroxide solution as the electrolyte to assemble a supercapacitor with a capacitance of 1510F / g, after charging and discharging 1000 times, the capacity remains 99.5%.

Embodiment 2

[0026] 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 5°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 0.05mol / L nickel nitrate, 0.2mol / L aluminum nitrate and 0.02mol / L sodium chloride, select the potential value of -1.2V and the temperature at 0°C Electrolyze at constant potential for 10 seconds, take out the electrodes, wash with deionized water, and dry. Repeat the electrodeposition operation 100 times, use the obtained graphene / nickel-aluminum double metal hydroxide composite as the working electrode and the counter electrode, and use 5.0mol / L potassium hydroxide as the electrolyte to assemble a supercapacitor with a capacitance of 1950F / g. After charging and discharg...

Embodiment 3

[0028] 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 0.01mol / L nickel acetate, 0.01mol / L aluminum acetate and 0.06mol / L sodium sulfate. Potential electrolysis for 20 seconds, take out the electrode, wash with deionized water, and dry. Repeat the electrodeposition operation 100 times, use the obtained graphene / nickel-aluminum double metal hydroxide composite material as the working electrode and counter electrode, and 1.0mol / L potassium hydroxide solution as the electrolyte to assemble a supercapacitor with a capacitance of 1710F / g, after charging and discharging 1000 times, the capacity remains 99.9%.

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Abstract

The invention relates to an electrochemical preparation method of a graphene / nickel-aluminum bimetal hydroxide composite material for a super capacitor, belonging to the technical field of capacitor preparation. The method comprises the following steps of: putting graphite oxide in a beaker; adding deionized water and supporting electrolyte; performing ultrasonic oscillation and constant-potential electrolysis; taking out the electrode; washing the electrode with the deionized water and drying; putting the obtained graphene-modified electrode into a solution containing the precursor of nickel salt and aluminum salt; adding the supporting electrolyte; performing constant-potential electrolysis for 10 seconds; taking out the electrode; and washing the electrode with the deionized water and drying. In the invention, the electrolysis is performed under controlled potential to electrically and alternately deposit the graphene and bimetal hydroxide on the surface of the electrode, therefore, the reduction and deposition of the graphene oxide are finished at the same time, and more importantly, the accurate control on the layer thickness of graphene as well as the size and distribution density of bimetal hydroxide particles is realized; and moreover, the preparation of the material does not produce the 'three wastes' (waste gas, waste water and waste residues).

Description

technical field [0001] The invention relates to an electrochemical preparation method of a graphene / nickel-aluminum double metal hydroxide composite material for a super capacitor, belonging to the technical field of capacitor preparation. Background technique [0002] As a new type of energy storage device, supercapacitors have the characteristics of high energy density, high power density, fast charging speed, and long cycle life. They have broad application prospects in national defense, railways, electric vehicle electronics, communications, aerospace and other fields. . According to the energy storage mechanism, supercapacitors can be divided into electric double-layer capacitors and Faraday quasi-capacitors. The former uses the electric double layer generated by the directional arrangement of electrons, ions or dipoles on the surface of the electrode / solution to store charges, while the latter uses electrochemically active substances to generate chemical reactions in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 李在均牛玉莲顾志国郑佳金鑫
Owner 盐城市纺织染整产业园实业开发有限公司
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