Method for synthesizing graphene-nickel hydroxide composite supercapacitor electrode by using one-step hydrothermal method

A technology of supercapacitor and nickel hydroxide, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of low specific capacitance and no material capacitance performance, and achieve low cost and good electrochemical energy storage. Performance, simple process effect

Inactive Publication Date: 2016-11-09
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the development of graphene-nickel hydroxide composite electrode materials, the patent (preparation method of supercapacitor electrode material nickel hydroxide and graphene composite, CN103107022A) synthesized a nickel hydroxide-graphene composite with a sheet-like stacking structure, But it does not involve the capacitance performance of the material; the patent (a preparation method of graphene / α nickel hydroxide nanocomposite material, CN102683040A) prepared a graphene-nickel hydroxide composite, but the specific capacitance is relatively low

Method used

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  • Method for synthesizing graphene-nickel hydroxide composite supercapacitor electrode by using one-step hydrothermal method
  • Method for synthesizing graphene-nickel hydroxide composite supercapacitor electrode by using one-step hydrothermal method
  • Method for synthesizing graphene-nickel hydroxide composite supercapacitor electrode by using one-step hydrothermal method

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Experimental program
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Embodiment 1

[0014] Dissolve 0.1g of P123 and 0.01g of graphene oxide (prepared by the Hummer method, the same as above) in 20mL of deionized water, ultrasonically disperse for 2 hours to form a uniform dispersion, and then add 0.5816g (2mmol) nickel nitrate hexahydrate and 0.12g (2mmol) urea was added to the above uniform dispersion, stirred for 1h to form a uniform precursor solution, then the above precursor solution was transferred to a 25mL hydrothermal reaction kettle, and the weighed foamed nickel substrate (10mm×10mm×1mm ) was immersed in the precursor solution in the hydrothermal reactor, and reacted hydrothermally at 100°C for 5 hours to grow and deposit graphene-nickel hydroxide composite on the nickel foam substrate. After the reaction was completed, the nickel foam was taken out and placed in deionized water for ultrasonication. Wash until the washing solution is colorless, and then dry to obtain a graphene-nickel hydroxide composite active electrode.

[0015] The prepared act...

Embodiment 2

[0017] Dissolve 0.1g P123 and 0.01g graphene oxide in 20mL deionized water, ultrasonically disperse for 2 hours to form a uniform dispersion, then add 1.1632g (4mmol) nickel nitrate hexahydrate and 0.24g (4mmol) urea to the above uniform dispersion , stirred for 1 h to form a uniform precursor solution, then transferred the above precursor solution to a 25mL hydrothermal reactor, and immersed the weighed foam nickel substrate (10mm×10mm×1mm) in the precursor solution in the hydrothermal reactor In the body solution, hydrothermal reaction at 180 °C for 2 hours, the graphene-nickel hydroxide composite was grown and deposited on the foamed nickel substrate. After the reaction was completed, the foamed nickel was taken out and placed in deionized water for ultrasonic cleaning until the washing liquid was colorless, and then dried A graphene-nickel hydroxide composite active electrode is obtained.

[0018] With the prepared active electrode as the working electrode, the electrochem...

Embodiment 3

[0020] Dissolve 0.1g P123 and 0.01g graphene oxide in 20mL deionized water, ultrasonically disperse for 2 hours to form a uniform dispersion, then add 2.3264g (8mmol) nickel nitrate hexahydrate and 0.48g (8mmol) urea to the above uniform dispersion , stirred for 1 h to form a uniform precursor solution, then transferred the above precursor solution to a 25mL hydrothermal reactor, and immersed the weighed foam nickel substrate (10mm×10mm×1mm) in the precursor solution in the hydrothermal reactor In the body solution, hydrothermal reaction at 120 °C for 24 hours, the graphene-nickel hydroxide composite was grown and deposited on the foamed nickel substrate. After the reaction was completed, the foamed nickel was taken out and placed in deionized water for ultrasonic cleaning until the washing liquid was colorless, and then dried A graphene-nickel hydroxide composite active electrode is obtained. In this composite electrode, graphene-nickel hydroxide is uniformly deposited on the...

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Abstract

The invention discloses a method for synthesizing a graphene-nickel hydroxide composite supercapacitor electrode by using a one-step hydrothermal method. The method for synthesizing the graphene-nickel hydroxide composite supercapacitor electrode by using the one-step hydrothermal method comprises the following steps that: a non-ionic type polymer surfactant P123 (polyethylene oxide-polyoxypropylene-polyethylene oxide triblock copolymer) and oxidized graphene are dispersed in deionized water by ultrasonic dispersion, so that a uniform dispersion liquid can be formed; soluble nickel salt and urea are added into the above uniform dispersion liquid, the uniform dispersion liquid is stirred, so that a precursor solution can be obtained; and the precursor solution is transferred into a hydrothermal reactor, pre-washed foamed nickel is immersed in the precursor solution in the hydrothermal reactor, and the pre-washed foamed nickel and the precursor solution are subjected to a hydrothermal reaction for 24 hours under 100 DEG C to 180 DEG C, a graphene-nickel hydroxide composite can be grown and deposited on the surface of a foamed nickel substrate, so that an active electrode can be formed. The synthesizing method is simple, is easy to control and is low in cost. The active electrode prepared by using the synthesizing method has high specific capacitance and high rate performance.

Description

technical field [0001] The invention belongs to the technical field of synthesis of supercapacitor electrodes, in particular to a method for synthesizing graphene-nickel hydroxide composite supercapacitor electrodes by a one-step hydrothermal method. Background technique [0002] Supercapacitor is a kind of electrochemical energy storage device with high power density, fast charge and discharge rate, long life and wide operating temperature range. There are broad application prospects in facilities. Electrode materials are the key components of supercapacitors, and their structure, composition and surface properties directly determine the electrochemical energy storage performance of supercapacitors. According to the energy storage mechanism, supercapacitors mainly store charges through ion adsorption on the surface of porous electrodes (electric double layer capacitance) and fast reversible redox reactions on the surface of active electrodes (pseudocapacitance). Carbon ma...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/32
CPCY02E60/13H01G11/86H01G11/30H01G11/32
Inventor 高志永刘晓武大鹏常玖利徐芳蒋凯
Owner HENAN NORMAL UNIV
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