Method of preparing high-purity nano skutterudite thermoelectricity compound powder by non-water coprecipitation

A technology of skutterudite and co-precipitation, which is applied in the field of preparation of nano-skutterudite thermoelectric compound powder, can solve the problems of poor repeatability, inability to effectively reduce thermal conductivity, and large particle size of nano-powder, and achieve easy Effects of handling, narrow particle size distribution range, fine particle size

Inactive Publication Date: 2007-10-24
WUHAN UNIV OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the microstructural scales of the skutterudite compounds prepared by the current preparation technology are micron and submicron, which cannot effectively reduce the thermal conductivity and improve the thermoelectric performance.
[0004] The preparation of nanopowder by co-prec

Method used

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  • Method of preparing high-purity nano skutterudite thermoelectricity compound powder by non-water coprecipitation
  • Method of preparing high-purity nano skutterudite thermoelectricity compound powder by non-water coprecipitation
  • Method of preparing high-purity nano skutterudite thermoelectricity compound powder by non-water coprecipitation

Examples

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Example Embodiment

[0022] Example 1: (Preparation of CoSb 3 Compound nano powder)

[0023] As shown in Figure 1, with 1.4276g CoCl 2 ·6H 2 O and 4.1061g SbCl 3 As the starting material, it was dissolved in 70ml absolute ethanol solution to form A solution; 4.3821g NaOH was used as precipitant, dissolved in 50ml absolute ethanol solution to form B solution. The solution B is slowly added to the solution A while stirring to produce a gray-green precipitate with very fine particles to obtain a precursor mixed solution containing the precipitate. The precursor mixed solution containing the precipitate is directly dried and ground into powder, and then the ground powder is placed in a tubular atmosphere furnace, 2 Raise the temperature to 300-600℃ in the atmosphere for reduction heat treatment. After the holding time is 0.5-3h, it is cooled with the furnace. The obtained powder (black powder) is filtered with deionized water, washed, and vacuum-dried to obtain nano-square cobalt. Mineral compound powder....

Example Embodiment

[0024] Example 2: (Preparation of Ni 0.5 Co 3.5 Sb 12 Compound nano powder)

[0025] With 0.1782g NiCl 2 ·6H 2 O, 1.2491g CoCl 2 ·6H 2 O and 4.1060g SbCl 3 As the starting material, it was dissolved in 70ml absolute ethanol solution to form A solution; 4.3653g NaOH was used as precipitant and dissolved in 50ml absolute ethanol solution to form B solution. The B solution was slowly added to the A solution while stirring, resulting in a very fine gray-green precipitate, and a precursor mixed solution containing the precipitate was obtained. The precursor mixed solution containing the precipitate is directly dried and ground into powder, and then the ground powder is placed in a tubular atmosphere furnace, 2 The temperature is raised to 300-600℃ under the atmosphere for reduction heat treatment, the holding time is 0.5-3h and then the furnace is cooled. The obtained powder is filtered with deionized water, washed, and vacuum dried to obtain high-purity nano-skutterudite Ni 0.5 Co 3.5...

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Abstract

The invention discloses a making method of thermoelectric compound powder of nanometer skutterudite, which comprises the following steps: (1) adopting chloride of atom M and chloride of atom X as original material with chemical structure formula of the thermoelectric compound powder of nanometer skutterudite at MX3; setting the molar rate of M and X at 1/(2. 8-3. 1); setting the weight rate of sediment NaOH and chloride at 0. 5-1. 2:1; allocating the molar density of original material of chloride and NaOH sediment at 0. 1-1mol/L in the anhydrous alcohol; (2) dissolving original material of chloride and NaOH sediment in the anhydrous alcohol; obtaining the composite predecessor solution with sediment; (3) drying; grinding; powdering; (4) reducing heat disposal; filtering; washing; drying in the vacuum; obtaining the product. The invention reduces grain size of thermoelectric compound powder of nanometer skutterudite with even phase and high phase, which possesses good repeatability, simple technical course and simple operation.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a preparation method of nano-skutterudite thermoelectric compound powder. Background technique [0002] Thermoelectric conversion technology is a new type of environmentally friendly power generation and refrigeration technology that is becoming more and more important in the field of new energy. It shows broad application prospects in thermoelectric power generation and thermoelectric refrigeration. It is an indispensable aspect for the sustainable development of mankind in the 21st century One of the important technical foundations that is missing. Thermoelectric materials are the core substances in thermoelectric conversion technology. At present, skutterudite thermoelectric compounds are a new type of medium-temperature thermoelectric materials with excellent thermoelectric properties that have attracted widespread attention. It is named for its origin in the ...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01G51/00C01G49/00C01G30/00C01G28/00
Inventor 唐新峰褚颖陈玉立徐源张清杰
Owner WUHAN UNIV OF TECH
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