Method for preparing high-thermoelectric-property metal oxide

A technology of thermoelectric properties and oxides, which is applied in the field of preparing high-performance thermoelectric materials, can solve problems such as hidden dangers of safe industrial production, and achieve the effects of improving ZT value, high repeatability, and improving power factor.

Inactive Publication Date: 2013-08-28
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, reducing gases pose a huge hidden danger to safe industrial production

Method used

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  • Method for preparing high-thermoelectric-property metal oxide
  • Method for preparing high-thermoelectric-property metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method for preparing metal oxides with high thermoelectric properties comprises the following three steps:

[0024] a. Stir and mix titanium dioxide nanopowder (4g) with a particle size of 5-30nm, niobium pentachloride (3.9g) and urea (23.7g) evenly, then transfer them into a 250ml crucible, and then put the crucible into a 600°C horse Keep the temperature constant in the furnace for 45 minutes, then take out the crucible and wait for cooling to obtain a light yellow powder with an average particle size of 14nm (scanning electron microscope picture is shown in figure 1 shown);

[0025] b. Weigh 4g of the yellow powder obtained in step a and 0.26g of metal titanium powder (the mass of the metal titanium powder and heteroatom-doped titanium dioxide metal oxide nanoparticles is 0.065:1) into the planetary ball mill In the agate jar, add absolute ethanol again, then ball mill on the planetary ball mill for 36 hours, and the rotating speed is 600RPM. The precipitate ob...

Embodiment 2

[0028] a. Stir and mix titanium dioxide nanopowder (4g) with a particle size of 5-30nm, niobium pentachloride (3.9g) and urea (7.9g) evenly, then transfer it into a 250ml crucible, and then put the crucible into a 700°C horse Keep the temperature in the furnace for 30 minutes, then take out the crucible and wait for cooling to obtain a light yellow powder;

[0029] B, weighing the pale yellow powder obtained in 4g step a and 0.26g metal titanium powder (the quality of the titanium dioxide metal oxide nanoparticles doped with metal titanium powder and heteroatoms is 0.065:1) put into the agate of planetary ball mill In the tank, add absolute ethanol again, then ball mill on planetary ball mill for 20 hours, the rotating speed is 600RPM. The precipitate obtained after ball milling was washed with 400ml of absolute ethanol, and dried at 120°C for 2 hours to obtain a dry product;

[0030] c, the dry product that obtains in the step b in 1 * 10 4 kgf / cm 2 It was formed by cold p...

Embodiment 3

[0032] a. Stir and mix titanium dioxide nanopowder (4g) with a particle size of 5-30nm, niobium pentachloride (13.5g) and urea (17.6g) evenly, then transfer it into a 250ml crucible, and then put the crucible into a 500°C horse Keep the temperature in the furnace for 120 minutes, then take out the crucible and wait for cooling to obtain a light yellow powder;

[0033] B, weigh the light yellow powder obtained in 4g step a and 0.02g metal titanium powder (the quality of metal titanium powder and the titanium dioxide metal oxide nanoparticle doped with heteroatoms is 0.005:1) put into the agate of planetary ball mill In the tank, add absolute ethanol again, then ball mill on planetary ball mill for 20 hours, the rotating speed is 300RPM. The precipitate obtained after ball milling was washed with 400ml of absolute ethanol, and dried at 80°C for 2 hours to obtain a dry product;

[0034] c, the dry product that obtains in the step b in 5 * 10 3 kgf / cm 2 It was formed by cold pr...

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Abstract

The invention discloses a method for preparing a high-thermoelectric-property metal oxide. The method comprises the following three steps of a, synthesizing metal oxide nano particles which are doped with heteroatom; b, mechanically ball milling and mixing the nano particles; and c, sintering the metal oxide nano particles. The metal oxide nano particles doped with the heteroatom prepared by adopting a burning method are simple and rapid to synthesize in one step, and the repetition is high. By adopting the method, the power factor which is related to the electric performance can be maximally increased while the heat conductivity is reduced, so that the ZT (zone time) value, i.e. the thermoelectric property, of a thermoelectric material can be greatly increased.

Description

Technical field: [0001] The invention relates to a method for preparing high-performance thermoelectric materials, in particular to a method for preparing metal oxides with high thermoelectric performance. Background technique: [0002] Thermoelectric materials are a type of semiconductor that use the movement of internal carriers (electrons and holes) to directly convert thermal energy into electrical energy, or transfer thermal energy from the cold end to the hot end driven by electrical energy. Therefore, thermoelectric materials can be manufactured into thermoelectric devices and applied in fields such as thermoelectric power generation and refrigeration. Thermoelectric devices have the advantages of compact structure, reliable performance, no noise, no wear, no leakage, flexible movement, and miniaturization during operation. Various energy sources can be used in a green and environmentally friendly manner, and the efficiency of energy utilization can also be improved....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/01C04B35/46C04B35/453
Inventor 苗蕾刘呈燕周建华
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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