Nano nickel oxide/graphene composite electrode material as well as preparation method and application thereof

A composite technology of nano-nickel oxide and graphene, which is applied in the field of nanomaterials and electrochemical energy, can solve the problems of easy agglomeration of NiO nanomaterials, electrolyte pollution of the environment, and restrictions on commercial development, achieving high energy density, low cost, and high efficiency. The effect of power density

Active Publication Date: 2014-03-26
WENZHOU UNIVERSITY
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Problems solved by technology

[0005] As we all know, amorphous hydrated ruthenium oxide is the most promising electrode material for high-power and high-energy-density supercapacitors, but it is expensive and resource-scarce, and the electrolyte used pollutes the environment, which greatly limits its commercial development.
NiO and other oxide electrode materials have the same characteristics as RuO 2 ·xH 2 O has similar functions and is cheap, but NiO has two very fatal shortcomings as a supercapacitor material: one is that the conductivity is relatively poor, and the other is that NiO nanomaterials are easy to agglomerate
Patent CN101733985A discloses a graphene / nickel oxide layered structure composite film and its preparation method, using ultrasonic method to mix graphene and nickel oxide, and then heat treatment at high temperature to obtain graphene / nickel oxide layered structure composite film, which is prepared The resulting composite film has good electrical conductivity and mechanical strength, but it needs to be obtained by high-temperature sintering, and the reaction time is too long; patent CN102184781A reports a nano-nickel oxide / graphene composite material and its preparation method, mainly using a chemical solution method Prepare the precursor material of nickel oxide / graphene, and then sinter at high temperature to obtain nickel oxide / graphene composite material. Although this method improves the specific capacitance of the composite material to a certain extent, it is also carried out under high temperature sintering, and the cost is relatively low. higher

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  • Nano nickel oxide/graphene composite electrode material as well as preparation method and application thereof
  • Nano nickel oxide/graphene composite electrode material as well as preparation method and application thereof
  • Nano nickel oxide/graphene composite electrode material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0053] Take 20mL of 0.2M Ni(NO 3 ) 2 solution, added to the beaker, and then dripped into 18mL of 1M urea (CO(NH 2 ) 2 ), stirred at 90° C. for 6 hours, cooled rapidly to room temperature, precipitated, filtered, and the filter cake was washed 3 times with 50 mL of distilled water and 30 mL of absolute ethanol respectively. The solid product was dried under vacuum at 110°C for 5 hours and then heated to 300°C in air to obtain 180 mg of NiO.

[0054] Take 15 mg of the above-mentioned NiO, add it to the prepared 50 mL aqueous solution of graphene oxide with a concentration of 0.2 mg / mL, sonicate for 10 minutes, add 2 mL of hydrazine hydrate dropwise, stir and heat at 80 ° C for 5 hours, and naturally cool to room temperature. After centrifugation, the solid was washed three times with 30 mL of deionized water and 30 mL of ethanol, and the solid product was vacuum-dried at 90° C. for 6 hours to obtain 25 mg of a nickel oxide-graphene composite, that is, the weight ratio NiO / rG...

Embodiment 2

[0057] Take 20mL of 0.2M NiSO 4 solution, added to the beaker, and then dripped into 18mL of 1M urea (CO(NH 2 ) 2 ), stirred at 90° C. for 6 hours, cooled rapidly to room temperature, precipitated, filtered, and the filter cake was washed 3 times with 50 mL of distilled water and 30 mL of absolute ethanol respectively. The solid product was dried under vacuum at 110°C for 5 hours, and then heated to 300°C in air to obtain 208 mg of NiO.

[0058] Take 30mg of the above-mentioned NiO, add it to the prepared 38mL aqueous solution of graphite oxide with a concentration of 0.2mg / mL, sonicate for 10 minutes, add 2mL of hydrazine hydrate dropwise, stir and heat at 80°C for 5 hours, cool naturally to room temperature, and centrifuge Separated, the solid was washed three times with 30mL deionized water and 30mL ethanol respectively, and the solid product was vacuum-dried at 90°C for 6 hours to obtain 37.6mg of a nickel oxide-graphene composite, that is, the weight ratio NiO / rGO=4 / 1...

Embodiment 3

[0061] Take 20mL of 0.2M NiCl 2 solution, added to the beaker, and then dripped into 18mL of 1M urea (CO(NH 2 ) 2), stirred at 90° C. for 6 hours, cooled rapidly to room temperature, precipitated, filtered, and the filter cake was washed 3 times with 50 mL of distilled water and 30 mL of absolute ethanol respectively. The solid product was dried under vacuum at 110°C for 5 hours, and then heated to 300°C in air to obtain 117 mg of NiO.

[0062] Take 20mg of the above-mentioned NiO, add it to the prepared 230mL aqueous solution of graphite oxide with a concentration of 0.2mg / mL, sonicate for 10 minutes, add 5mL of hydrazine hydrate dropwise, stir and heat at 80°C for 5 hours, cool naturally to room temperature, centrifuge Separation, the solid was washed three times with 30mL deionized water and 30mL ethanol respectively, and the solid product was vacuum-dried at 90°C for 6 hours, and the product nickel oxide graphene composite was 66mg, that is, the weight ratio NiO / rGO=3 / 7 ...

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Abstract

The invention discloses a nano nickel oxide / graphene composite electrode material as well as a preparation method and an application thereof. The pore diameter range of the nano nickel oxide / graphene composite electrode material is 2-65nm, the nano nickel oxide / graphene composite electrode material comprises nano nickel oxide with the average particle diameter of 750nm and reduction-oxidation graphene with the thickness of 1-20nm, and the mass ratio of the nano nickel oxide to the reduction-oxidation graphene is 1:(0.01-100). According to the invention, the internal resistance of a composite electrode is lowered mainly by utilizing the high conductivity of the reduction-oxidation graphene, and the high-power discharge capability of a composite capacitor is improved by utilizing the characteristics, such as high specific surface area and capability of serving as a double electric layer capacitor, of the reduction-oxidation graphene; and simultaneously, by utilizing the high pseudo-capacitance characteristic of the nano-porous nickel oxide in the composite electrode, the composite electrode has the good power characteristic of the double electric layer capacitor and the high specific capacitance characteristic of a pseudo-capacitor at the same time, so that the composite electrode material prepared by the invention has the characteristics of high specific capacitance, high energy density, high power density and long cycle life and is a super capacitor which is good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy and the field of nanomaterials, and specifically relates to a nano-nickel oxide / reduced graphene oxide composite supercapacitor with a large-current discharge function and a preparation method of an electrode material thereof. Background technique [0002] As a new type of energy storage element, supercapacitor has the advantages of high energy density and power density, long cycle life and low voltage operation. It is widely used in high-power pulse power supply, electric vehicle drive power supply and other fields. According to its energy storage mechanism, supercapacitors are usually divided into electric double layer supercapacitors and pseudocapacitor supercapacitors. [0003] Electric double layer supercapacitors are based on the adsorption of positive and negative ions on the surface between the carbon electrode and the electrolyte interface, respectively, resulting in a pote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 王舜金辉乐卜永锋
Owner WENZHOU UNIVERSITY
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