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Sonochemistry method for preparing AgSbTe2 thermoelectric compound powder

An ultrasonic chemistry and compound technology, applied in chemical instruments and methods, selenium/tellurium compounds, inorganic chemistry, etc., can solve the problems of polycrystalline materials with different phases, microstructures and properties, single compounds, and long reaction cycles, etc. The raw materials are cheap and easy to obtain, the process is simple and easy to control, and the reaction time is short.

Inactive Publication Date: 2009-12-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, for AgSbTe 2 The preparation methods of polycrystalline compounds include solid state reaction (Solid state reaction, SSR), melting method (Melt reaction, MR), mechanical alloying (Mechanicai alloying, MA), but the above methods require high temperature or a long reaction cycle. Energy consumption is large, and AgSbTe obtained by different preparation methods 2 Polycrystalline materials have different phases, microstructures and properties, and it is difficult to obtain compounds with a single phase composition

Method used

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  • Sonochemistry method for preparing AgSbTe2 thermoelectric compound powder
  • Sonochemistry method for preparing AgSbTe2 thermoelectric compound powder
  • Sonochemistry method for preparing AgSbTe2 thermoelectric compound powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, AgSbTe 2 The sonochemical preparation method of thermoelectric compound powder, it comprises the following steps:

[0025] 1) According to deionized water: AgNO 3 Ag in + : C 4 h 4 KO 7 Sb 1 / 2H 2 Sb in O 3+ : TeO 2 Te in 4+ The ratio is 1L: 0.0166mol: 0.0212mol: 0.04mol, deionized water, AgNO 3 、C 4 h 4 KO 7 Sb 1 / 2H 2 O and TeO 2 ,spare;

[0026] Deionized water was used as solvent, followed by analytically pure AgNO 3 、C 4 h 4 KO 7 Sb 1 / 2H 2 O and TeO 2 , and stirred and mixed to obtain a mixed solution A;

[0027] 2) Measure the ammonia water according to the volume ratio of the ammonia water and the mixed solution A as 8:100, pour the ammonia water into the mixed solution A, and sonicate for 30 minutes to obtain the mixed solution B;

[0028] 3) According to mixed solution B: reducing agent NaBH 4 The ratio is 1L: 0.08mol, choose the reducing agent NaBH 4 ; Add reducing agent NaBH in mixed solution B 4 (concentrati...

Embodiment 2

[0034] Such as figure 1 As shown, AgSbTe 2 The sonochemical preparation method of thermoelectric compound powder, it comprises the following steps:

[0035] 1) According to deionized water: AgNO 3 Ag in + : C 4 h 4 KO 7 Sb 1 / 2H 2 Sb in O 3+: TeO 2 Te in 4+ The ratio is 1L: 0.02mol: 0.02mol: 0.04mol, deionized water, AgNO 3 、C 4 h 4 KO 7 Sb 1 / 2H 2 O and TeO 2 ,spare;

[0036] Deionized water was used as solvent, followed by analytically pure AgNO 3 、C 4 h 4 KO 7 Sb 1 / 2H 2 O and TeO 2 , and stirred and mixed to obtain a mixed solution A (Ag is formed in the mixed solution A + , Sb 3+ 、 Te 4+ The concentrations of the three metal ions are 0.0166mol / L, 0.02mol / L, and 0.04mol / L, respectively);

[0037] 2) Measure the ammonia water according to the volume ratio of the ammonia water and the mixed solution A as 8:100, pour the ammonia water into the mixed solution A, and sonicate for 30 minutes to obtain the mixed solution B;

[0038] 3) According to mixed so...

Embodiment 3

[0043] Such as figure 1 As shown, AgSbTe 2 The sonochemical preparation method of thermoelectric compound powder, it comprises the following steps:

[0044] 1) According to deionized water: AgNO 3 Ag in + : C 4 h 4 KO 7 Sb 1 / 2H 2 Sb in O 3+ : TeO 2 Te in 4+ The ratio is 1L: 0.0176mol: 0.0204mol: 0.04mol, deionized water, AgNO 3 、C 4 h 4 KO 7 Sb 1 / 2H 2 O and TeO 2 ,spare;

[0045] Deionized water was used as solvent, followed by analytically pure AgNO 3 、C 4 h 4 KO 7 Sb 1 / 2H 2 O and TeO 2 , and stirred and mixed to obtain a mixed solution A (Ag is formed in the mixed solution A + , Sb 3+ 、 Te 4+ The concentrations of the three metal ions are 0.02mol / L, 0.0212mol / L, and 0.04mol / L, respectively);

[0046] 2) Measure the ammonia water according to the volume ratio of the ammonia water and the mixed solution A as 8:100, pour the ammonia water into the mixed solution A, and sonicate for 30 minutes to obtain the mixed solution B;

[0047] 3) According to mix...

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Abstract

The invention relates to a method for preparing AgSbTe2 thermoelectric compound powder, in particular to a sonochemistry method for preparing the AgSbTe2 thermoelectric compound powder. The method is characterized by including the following steps: 1) deionized water is used as solvent, and analytically pure AgNO3, C4H4KO7Sb-1 / 2H2O and TeO2 are added to and stirred and mixed with the solvent, thereby obtaining mixed liquid A; 2) ammonia is poured into the mixed liquid A, and the mixture obtained is processed by ultrasound for 30 minutes, thereby obtaining mixed liquid B; 3) reducing agent NaBH4 is added to and thoroughly reacts with the mixed liquid B under ultrasound for 2 to 6 hours, thereby obtaining a product C; 4) the product C obtained in the step 3) is centrifuged and is dried in a vacuum drying oven to obtain a precursor of the AgSbTe2 thermoelectric compound; and 5) the precursor obtained in the step 4) is processed by reduction in hydrogen at 450 to 500 DEG C for 1 to 4 hours, thereby obtaining the AgSbTe2 thermoelectric compound powder. The method has the advantages of low-cost and easily accessed raw materials, simple and easily controlled technology, short reaction time, low energy consumption, high safety, favorable repeatability and no pollution, and can be used for large-scale preparation.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to an AgSbTe 2 The preparation method of thermoelectric compound powder. Background technique [0002] Thermoelectric conversion technology is a technology that uses the Seebeck effect of semiconductor thermoelectric materials to directly convert thermal energy into electrical energy. Because it does not contain the huge transmission mechanism required by other power generation technologies, it has the characteristics of small size, long life, high reliability, simple manufacturing process, low manufacturing and operating costs, and wide application, so it has been valued by scientists. The field has broad prospects for development. [0003] AgSbTe 2 The compound is a kind of p-type thermoelectric material studied earlier. It has a very low lattice thermal conductivity at room temperature, so that the material has a higher ZT value than other traditional materials. Because th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00
Inventor 唐新峰徐静静杜保立张文浩张清杰
Owner WUHAN UNIV OF TECH
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