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Preparation method of porous metal nickel and nickel-based porous film super-capacitor electrode material on surface of porous metal nickel

A technology of supercapacitor electrodes and porous metals, which can be used in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, and can solve problems such as insufficient cost and process difficulty.

Inactive Publication Date: 2015-02-04
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] Although the above-mentioned subsequent improved methods can achieve the effect of improving the rate performance, but in the preparation process, a three-electrode electrochemical workstation is required to control the morphology of the film, so it has obvious shortcomings in terms of cost and process difficulty.

Method used

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  • Preparation method of porous metal nickel and nickel-based porous film super-capacitor electrode material on surface of porous metal nickel
  • Preparation method of porous metal nickel and nickel-based porous film super-capacitor electrode material on surface of porous metal nickel
  • Preparation method of porous metal nickel and nickel-based porous film super-capacitor electrode material on surface of porous metal nickel

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preparation example Construction

[0024] The embodiment of the present invention provides a method for preparing porous metal nickel and its surface nickel-based oxide porous thin film supercapacitor electrode material, comprising the following steps:

[0025] S10, cleaning the metal nickel base;

[0026] S20, the metal nickel base is used as the positive electrode and the platinum sheet is used as the negative electrode, and the metal nickel base of the positive electrode is anodized by a step anodic oxidation method to form porous nickel;

[0027] S30, treating the porous nickel obtained in step S20 in a 1M-6M alkali solution by cyclic voltammetry at a rate of 10mV / s-100mV / s to obtain a porous nickel oxide film;

[0028] Alternatively, the porous nickel obtained in step S20 is treated with a constant current charge and discharge method with a surface current density of 1mA / cm2-60mA / cm2 in a lye solution of 1M to 6M to obtain porous metal nickel and its surface nickel-based oxide A method for preparing a por...

Embodiment 1

[0039] S10, put 1cm 2 Metal nickel is cleaned by ultrasonic cleaning with acetone, ethanol and deionized water for 10 minutes each;

[0040] S20, in a common power supply, use a nickel sheet as the positive electrode, a platinum sheet as the negative electrode, and use a cesium fluoride solution containing 1M sulfuric acid and 0.02M as the electrolyte, and carry out step anodic oxidation treatment under stirring conditions; wherein,

[0041] The step length is 5s, and the step length of each step is equal, and each step is boosted by 0.1V, so that the voltage rises to 1.2V, and then the constant potential is maintained for 4h to form porous nickel oxide;

[0042] S30, treating the porous nickel oxide in 1M potassium hydroxide or sodium hydroxide aqueous solution with a voltage change rate of 10 mV / s by cyclic voltammetry, and obtaining a porous nickel oxide film after 48 hours of treatment.

[0043] The porous nickel oxide film obtained in the present embodiment 1 was tested ...

Embodiment 2

[0045] S10, put 1cm 2 Metal nickel is cleaned by ultrasonic cleaning with acetone, ethanol and deionized water for 10 minutes each;

[0046] S20, under a programmable DC power supply, with a nickel sheet as the positive electrode, a platinum sheet as the negative electrode, and a solution containing 1M sulfuric acid and 0.02M cesium fluoride as the electrolyte; step anodic oxidation treatment is performed under stirring conditions, wherein,

[0047] The step length is 10s, and each step is equal in length, and the voltage is boosted by 0.1V in each step, so that the voltage rises to 1.2V, and then the constant potential is maintained for 3h to form porous nickel oxide;

[0048] S30, treating the porous nickel oxide with cyclic voltammetry at a rate of 20 mV / s in 1M potassium hydroxide or sodium hydroxide aqueous solution for 120 hours to obtain a porous nickel oxide film.

[0049] The porous nickel oxide film obtained in this embodiment 2 was tested at 40mA / cm 2 Under the co...

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Abstract

The invention provides a preparation method of a porous metal nickel and a nickel-based porous film super-capacitor electrode material on the surface of the porous metal nickel. The method comprises the steps of taking a metal nickel base as an anode, and performing step anodization on the anode metal nickel base by a step anodization method to form the porous nickel; and then dissolving the porous nickel into alkali liquor, processing by a circulating voltammetry or a constant current charging and discharging method, so as to form the porous metal nickel and the nickel-based porous film super-capacitor electrode material on the surface of the porous metal nickel. According to the method provided by the invention, the electric vibration is generated on the anode by a step anodization method, and performing pore-forming on the metal nickel. The method can be realized simply by two-pole equipment, and a prepared nickel-based oxide thin film is very high in rate capability, therefore the specific capacitance can reach 0.564F / cm2 after circulating for 100,000 times under the condition of large current of 40Ma / cm2; furthermore, the specific capacitance can reach 0.6F / cm2 under the condition of large current of 100mA / cm2, and the circulating life is not lower than 10,000 times.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a method for preparing porous metal nickel and its surface nickel-based oxide porous film supercapacitor electrode material. Background technique [0002] Supercapacitor, also known as electrochemical capacitor, is a new type of energy storage device with energy density and power density between traditional capacitors and secondary batteries. It has high power density, long service life, wide operating temperature range, clean and non-toxic, and is widely used in military, hybrid vehicles, wireless communications, electric power and other industries. According to the principle of energy storage in use, supercapacitors can be divided into electric double layer capacitors such as carbon materials, and pseudocapacitors such as conductive polymers and transition metal oxides. Among them, compared with electric double layer supercapacitor materials, pseudocapacito...

Claims

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Application Information

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IPC IPC(8): H01G11/26H01G11/86
CPCY02E60/13H01G11/26H01G11/86
Inventor 熊信柏程苗苗易超曾燮榕马俊
Owner SHENZHEN UNIV
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