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Preparation method of three-dimensional graphene/nickel hydroxide composite electrode material

A technology of nickel hydroxide and composite electrodes, applied in the field of physics, can solve the problems of low specific surface area, affecting the performance of material electrodes, etc., and achieve the effects of high specific surface area, high storage capacity, and high cycle charge and discharge times

Active Publication Date: 2018-03-06
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, the weak point that this method still exists is: the Ni(OH) that this method prepares 2 The electrode material composited with graphene has a sheet-like stacking structure, and the specific surface area is not high, which affects the electrode performance of the material

Method used

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  • Preparation method of three-dimensional graphene/nickel hydroxide composite electrode material
  • Preparation method of three-dimensional graphene/nickel hydroxide composite electrode material
  • Preparation method of three-dimensional graphene/nickel hydroxide composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: Preparation of a three-dimensional graphene / nickel hydroxide composite electrode based on a nickel hydroxide growth time of 2 hours.

[0053] Step A: Substrate pretreatment.

[0054] Use a flattener to thin the foamed nickel sheet with a thickness of 1.6mm to obtain a foamed nickel sheet with a thickness of 0.25mm, then clean the foamed nickel sheet with ethanol, deionized water, and 5M HCl solution, and finally use deionized water to remove the foamed nickel sheet. After cleaning, the foamed nickel flakes after cleaning are obtained.

[0055] Step B: Electrochemical deposition of copper.

[0056] The electrochemical three-electrode method is adopted, in which the working electrode is a foamed nickel sheet, the reference electrode is Ag / AgCl, and the auxiliary electrode is Pt, and the cleaned foamed nickel sheet is placed in 2M CuSO 4 ·5H 2 O and 1M HBO 3 In the mixed solution, add the electrochemical deposition voltage of -1V, deposit for 100 minutes, an...

Embodiment 2

[0069] Example 2: Preparation of a three-dimensional graphene / nickel hydroxide composite electrode at a nickel hydroxide growth time of 8 hours.

[0070] Step 1: Substrate pretreatment.

[0071] Use a flattener to thin the foamed nickel sheet with a thickness of 1.6mm to obtain a foamed nickel sheet with a thickness of 0.25mm, then clean the foamed nickel sheet with ethanol, deionized water, and 5M HCl solution, and finally use deionized water to remove the foamed nickel sheet. After cleaning, the foamed nickel flakes after cleaning are obtained.

[0072] Step 2: Electrochemical deposition of copper.

[0073] The electrochemical three-electrode method is adopted, in which the working electrode is a foamed nickel sheet, the reference electrode is Ag / AgCl, and the auxiliary electrode is Pt, and the cleaned foamed nickel sheet is placed in 2M CuSO 4 ·5H 2 O and 1M HBO 3 In the mixed solution, add the electrochemical deposition voltage of -0.5V, deposit for 150 minutes, and ob...

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Abstract

The invention discloses a preparation method based on a three-dimensional graphene / nickel hydroxide composite electrode material. The present invention first adopts the chemical vapor deposition method to grow graphene on the three-dimensional copper-nickel alloy, then uses the mixed solution of ferric chloride and hydrochloric acid to remove the alloy substrate, and finally, immerses the three-dimensional graphene in the mixed solution of nickel chloride and urea, Nickel hydroxide is grown on three-dimensional graphene to prepare a three-dimensional graphene / nickel hydroxide composite electrode material. The prepared three-dimensional graphene / nickel hydroxide composite electrode has ultra-high specific surface area, high storage capacity, and multiple ion transport channels, which can effectively improve the charge transmission efficiency. The invention provides a new idea for the preparation of the electrode material of the energy storage element, and can be used for preparing the composite electrode of the supercapacitor, and can also be used for preparing the composite electrode of the battery.

Description

technical field [0001] The invention belongs to the field of physical technology, and further relates to a method for preparing a three-dimensional graphene / nickel hydroxide composite electrode material in the field of material science and electrochemical technology. The composite electrode material prepared by the invention can be used for composite electrodes of supercapacitors and batteries. Background technique [0002] A supercapacitor is an energy storage element that stores energy through a polarized electrolyte. It is different from traditional chemical power sources, and is a power source with special properties between traditional capacitors and batteries. Electrode materials for supercapacitors include carbon-based electrode materials, metal oxide electrode materials, and conductive polymer electrode materials. [0003] Graphene is a single layer of carbon atoms through sp 2 Graphene is a two-dimensional honeycomb lattice carbon-based new material that is hybri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86
CPCY02E60/13
Inventor 王东宁静张进成陆芹穆美珊郝跃
Owner XIDIAN UNIV
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