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Preparation method of flower-shaped nanometer nickel oxide

A nano-nickel oxide and sheet-like technology, which is applied in the field of electrochemical material preparation, can solve the problems that are difficult to meet the requirements, and achieve the effect of improving electrochemical performance and excellent cycle stability

Active Publication Date: 2019-05-14
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the size of existing commercial products is more than micron, it is difficult to meet the requirements

Method used

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  • Preparation method of flower-shaped nanometer nickel oxide
  • Preparation method of flower-shaped nanometer nickel oxide
  • Preparation method of flower-shaped nanometer nickel oxide

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preparation example Construction

[0023] The invention provides a method for preparing flower flake nano-nickel oxide, comprising the following steps:

[0024] The nickel matrix is ​​electrolyzed in a chloride salt electrolyte to obtain a precursor;

[0025] The precursor is subjected to heat treatment to obtain flake-shaped nano-nickel oxide.

[0026] In the invention, the nickel matrix is ​​electrolyzed in a chloride salt electrolyte to obtain a precursor. In the present invention, the nickel matrix preferably includes flat nickel or porous nickel, and the purity of the flat nickel or porous nickel is preferably above 99%. The present invention has no special requirements on the source of the flat nickel or porous nickel, and commercially available products known to those skilled in the art as working electrodes can be used.

[0027] In the present invention, in the chloride salt electrolyte, the concentration of chloride ions is preferably 15-100 g / L, more preferably 18-90 g / L, and even more preferably 20...

Embodiment 1

[0036] First, clean the pure nickel plate with distilled water to remove dust and sodium hydroxide solution, and then wash it with ionized water and ethanol to obtain a clean nickel surface; secondly, prepare NaCl electrolyte, Cl - Concentration is 35g / L; Then, the nickel plate that cleans up is immersed in electrolyte as working electrode; Utilize electrochemical anode constant current technique to carry out electrolysis (anode current is: 10mA / cm 2 ). As the electrolysis proceeds, green nickel hydroxide precipitates can be obtained in the solution. After the precipitate is washed and dried, it is placed in a muffle furnace for heat treatment at 250° C. for 10 hours to obtain a flake-shaped nano-nickel oxide product.

[0037] Utilize transmission electron microscope to characterize the morphology of embodiment 1 gained product, the result is as follows figure 1 shown. Depend on figure 1 It can be seen that the product obtained in Example 1 is a flake-like nano-nickel oxid...

Embodiment 2

[0040] First, the porous nickel was cleaned with distilled water to remove dust and concentrated alkali to remove oil, and then cleaned with ionized water and ethanol to obtain a clean nickel surface; secondly, NaCl+KCl electrolyte was prepared with a mass concentration ratio of 50%:50%, Cl - The total concentration is 15g / L; then, immerse the cleaned nickel plate as the working electrode in the electrolyte; utilize the electrochemical anode constant voltage technique to carry out electrolysis (by regulating the voltage so that the average value of the current is: 5mA / cm 2 ). As the electrolysis proceeds, green nickel hydroxide precipitates can be obtained in the solution. After the precipitate is washed and dried, it is placed in a muffle furnace for heat treatment at 450° C. for 1 hour to obtain a flake-shaped nano-nickel oxide product.

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Abstract

The invention belongs to the technical field of electrochemical materials, and in particular relates to a preparation method of flower-shaped nanometer nickel oxide. The preparation method of the flower-shaped nanometer nickel oxide comprises the following steps: electrolyzing a nickel substrate in a chloride electrolyte to obtain a precursor; and performing heat treatment on the precursor to obtain the flower-shaped nanometer nickel oxide. According to the invention, electrochemical oxidation and heat treatment are combined, so that the nickel oxide with a flower-like stacked structure is obtained; and the single piece of nickel oxide has an ultra-thin structure, which is beneficial to improving the electrochemical performance of the material. The results of embodiments show that the nickel oxide prepared by the preparation method provided by the invention has a specific capacity of 170 mAh / g when the nickel oxide is used as a super-capacitor positive electrode material, and has excellent cycle stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical materials, and in particular relates to a preparation method of flake-shaped nano-nickel oxide. Background technique [0002] In recent years, research on electrochemical supercapacitors has received great attention worldwide. Supercapacitors have the advantages of high rate charge and discharge, long cycle life, and environmental friendliness. Therefore, the development of highly active electrode materials is an urgent and promising work in the field of energy storage. Supercapacitors are usually based on activated carbon materials, but the energy density of activated carbon is too low, which limits its application in the field of energy storage. [0003] The specific capacity of nickel oxide is dozens of times that of carbon materials, and it can be widely concerned and reported as a battery-type supercapacitor material. In alkaline electrolyte, nickel oxide is a highly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/46H01G11/86
CPCY02E60/13
Inventor 樊玉欠高天翼杨兰玉袁朝晖王靖宇闫硕范展鹏
Owner YANSHAN UNIV
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