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Preparation method of caky-structure nano zinc oxide material

A nano-zinc oxide, cake-like technology, applied in the field of preparation of zinc oxide materials, can solve the problems of unfavorable zinc oxide charge and discharge rate and electrode stability, unfavorable lithium ion intercalation and deintercalation, and long electron path, so as to reduce the electron space The effect of high hole recombination rate, low requirement for reaction equipment and low production cost

Inactive Publication Date: 2014-02-05
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although granular nano-zinc oxide with general morphology has a large specific surface area, the process path for electrons to travel from the particles to the electrode is long, resulting in recombination of electrons with holes before reaching the electrode.
In energy storage materials, such as lithium-ion batteries, large particles of zinc oxide are not conducive to the intercalation and deintercalation of lithium ions, and the particles are often pulverized due to volume changes during the charge-discharge cycle, which is not conducive to improving the charge-discharge rate of zinc oxide. and electrode stability

Method used

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  • Preparation method of caky-structure nano zinc oxide material

Examples

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Embodiment 1

[0011] A method for preparing nano-zinc oxide material with a cake-like structure, and proceed as follows: 1. Prepare a hexamethylene tetramine (HMT) aqueous solution of 0.1 mol / L of zinc nitrate with an equimolar ratio in the solution Add the surfactant compounded with alkylammonium bromide and Tween 80, the molar ratio of the two is 1:1, and the molar concentration of alkylammonium bromide is 1 mmol / L; 2. Use nitric acid to adjust the pH of the solution to 6.5; 3. The solution is placed in the reactor, the reactor is lined with polytetrafluoroethylene, and the glass electrode coated with ITO (ITO is indium tin oxide, a transparent conductive film) is added while the solution is added to the reactor, so that the zinc oxide is on the electrode 4. Keep the reaction kettle at 96°C in a constant temperature box and react for 3 hours; 5. Anneal the obtained electrode with zinc oxide in a sintering furnace at 400°C for 2 hours to obtain a special assembly shape Electrode or powder o...

Embodiment 2

[0013] A method for preparing nano-zinc oxide material with a cake-like structure, and proceed as follows: 1. Prepare a hexamethine tetraethyl (HMT) aqueous solution of zinc nitrate with an equimolar ratio of 0.05 mol / L in the solution Add the surfactant compounded with cationic and nonionic surfactants, the molar ratio of the two is 2:1, the molar concentration of the cationic surfactant is 0.01mmol / L; 2. Use nitric acid to adjust the pH of the solution to 5; 3. , Put the solution in the reactor, the reactor is lined with polytetrafluoroethylene, keep at 80℃ in a constant temperature device, and the reaction will proceed for 2 hours; 4. While the solution is added to the reactor, place the ITO glass electrode where zinc oxide needs to be deposited. The zinc oxide is grown on the electrode, washed and dried to obtain a powder; 5. The obtained electrode with zinc oxide or powder zinc oxide is annealed in a sintering furnace at 150° C. for 1 hour.

Embodiment 3

[0015] The difference between this embodiment and embodiment 1 is that the concentration of zinc nitrate and HMT in step 1 is 0.1 mol / L; in step 4, no electrode is added, and the precipitated zinc oxide is directly washed and dried to obtain the powder directly. Others are the same as in Example 1.

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Abstract

The invention discloses a preparation method of a caky-structure nano zinc oxide material, relating to a preparation method of a zinc oxide material.Zinc nitrate, hexamethylenetetramine, surfactant and the like are all common raw materials. The caky-structure nano zinc oxide material is synthesized by a hydrothermal process. The method comprises the following steps: adding a composite surfactant into a zinc nitrate-hexamethylenetetramine water solution, keeping the temperature at 80-100 DEG C to react for 2-5 hours in a reaction kettle, washing, drying, and carrying out annealing treatment to obtain the caky-structure nano zinc oxide. The method solves the problem that the nanocrystal in the dye-sensitized solar cell (DSSC) has large specific area and can shorten the electronic transmission path, and is beneficial to enhancing the conversion efficiency of the DSSC. The method has the advantages of low production cost, simple preparation process, low requirements for the reactor, mild reaction conditions and no environmental pollution, and can implement large-scale production.

Description

Technical field [0001] The invention relates to a method for preparing zinc oxide material. Background technique [0002] Undoped zinc oxide is an N-type semiconductor material with a direct band gap, with a band gap of 3.37 eV and a theoretical lithium content of 978 mAh / g, which is much larger than the 372 mAh / g of graphite. Zinc oxide material is cheap, non-toxic, and has similar photocorrosion resistance and photochemical stability to titanium dioxide, so it has a wide range of applications in photoelectric, photocatalysis, dye-sensitized nanocrystalline solar cells, lithium ion batteries and other fields. Although the granular nano-zinc oxide with a general appearance has a larger specific surface area, the process path for electrons from the particles to the electrode is longer, which causes the electrons to recombine with holes before they reach the electrode. In energy storage materials, such as lithium ion batteries, large particles of zinc oxide are not conducive to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485B82Y30/00
CPCY02E60/122C01G9/02B82Y30/00B82Y40/00
Inventor 吴海南薛名山李文王法军欧军飞
Owner NANCHANG HANGKONG UNIVERSITY
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