Method for preparing In4Se3 thermoelectric compound powder

A compound and powder technology, which is applied in the field of preparation of In4Se3 thermoelectric compound powder, can solve the problems of high reaction temperature, poor repeatability, and long cycle, and achieve the effects of good repeatability, low pollution, and short reaction time

Inactive Publication Date: 2010-12-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, the reported In 4 Se 3 The preparation methods of polycrystalline compounds are generally solid state reaction (Solid state reaction, SSR), melting method (Melt reaction, MR), etc., but the above-mentioned methods generally have poor repeatability, high reaction temperature, long cycle, and high energy consumption. question

Method used

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  • Method for preparing In4Se3 thermoelectric compound powder
  • Method for preparing In4Se3 thermoelectric compound powder
  • Method for preparing In4Se3 thermoelectric compound powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, an In 4 Se 3 The preparation method of thermoelectric compound powder, it comprises the steps:

[0024] 1) Take a 400 ml beaker, weigh 0.5865 g of analytically pure indium chloride tetrahydrate, 0.2681 g of sodium selenite in turn, take 200 ml of deionized water, stir and mix evenly to obtain a mixed solution A;

[0025] 2) Add 1 mL of commercially available 85% hydrazine hydrate solution to the mixed solution A obtained in step 1) as a reducing agent, control the reaction temperature to 60° C., and perform ultrasonic reaction for 3 hours to obtain product B. The ultrasonic frequency is 42 KHz, and the power is 100-400W;

[0026] 3) Centrifuge the product B obtained in step 2) at a centrifugation rate of 8000r / min for 3min, and freeze-dry the precipitate obtained by centrifugation in a freeze-drying device at a freeze-drying temperature of -80°C and a drying time of 2h , to obtain dark red powder;

[0027] 4) The dark red powder obtained ...

Embodiment 2

[0030] Such as figure 1 As shown, an In 4 Se 3 The preparation method of thermoelectric compound powder, it comprises the steps:

[0031] 1) Take a 500 ml beaker, weigh 1.5276 grams of analytically pure indium nitrate 4.5 hydrate, 0.5188 grams of sodium selenite in turn, take 400 milliliters of deionized water, stir and mix evenly to obtain a mixed solution A;

[0032] 2) Add 10 mL of commercially available 85% hydrazine hydrate solution as a reducing agent to the mixed solution A obtained in step 1), control the reaction temperature to 80° C., and perform ultrasonic reaction for 12 hours to obtain product B. The ultrasonic frequency is 42 KHz and the power is 100-400W;

[0033] 3) Centrifuge the product B obtained in step 2) at a centrifugation rate of 10,000 r / min for 5 minutes, and freeze-dry the precipitate obtained by centrifugation in a freeze-drying device at a freeze-drying temperature of -85°C and a drying time of 6 hours. Obtain dark red powder;

[0034] 4) Put ...

Embodiment 3

[0037] Such as figure 1 As shown, an In 4 Se 3 The preparation method of thermoelectric compound powder, it comprises the steps:

[0038] 1) Take a 400 ml beaker, weigh 0.5865 g of analytically pure indium chloride tetrahydrate, 0.2594 g of sodium selenite in turn, take 200 ml of deionized water, stir and mix evenly to obtain a mixed solution A;

[0039] 2) Add 3 mL of commercially available 85% hydrazine hydrate solution to the mixed solution A obtained in step 1) as a reducing agent, control the reaction temperature to 50° C., and react under stirring for 10 hours to obtain product B;

[0040] 3) Centrifuge the product B obtained in step 2) at a centrifugation rate of 12000r / min for 3min, and freeze-dry the precipitate obtained by centrifugation in a freeze-drying device at a freeze-drying temperature of -75°C and a drying time of 2h , to obtain dark red powder;

[0041] 4) The dark red powder obtained in step 3) was reduced in an atmosphere furnace at 475°C for 2 hours ...

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Abstract

The invention belongs to the field of new energy materials, and relates to a method for preparing In4Se3 thermoelectric compound powder. The method is characterized by comprising the following steps of: 1) preparing mixed solution A of an indium hydrated soluble salt and sodium selenite in a molar ratio of a selenium element to an indium element in the sodium selenite and the indium hydrated soluble salt of 3:4-3.1-4; 2) adding reducing agent hydrazine hydrate into the mixed solution A, controlling the reaction temperature to be between 50 and 80 DEG C and reacting for 3 to 12 hours to obtain a product B; 3) centrifuging the product B and performing freeze drying on sediment obtained by centrifuging to obtain dark red powder; and 4) reducing the dark red powder for 1 to 3 hours in the hydrogen atmosphere at the temperature of between 450 and 525 DEG C to obtain the In4Se3 thermoelectric compound powder. The method has the advantages of cheap and readily available raw materials, simple and easily controlled process, short reaction time, low power consumption, light pollution, high repeatability and suitability for large-scale preparation.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to an In 4 Se 3 The preparation method of thermoelectric compound powder. Background technique [0002] Thermoelectric materials are environmentally friendly functional materials, which have great potential in replacing traditional fossil fuels and improving the environment. Thermoelectric conversion technology is a technology that uses the Seebeck effect and Peltier effect of semiconductor thermoelectric materials to directly convert heat energy and 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] In 4 Se 3 The compound is a newly reported n-typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
Inventor 唐新峰刘丹丹李涵张清杰
Owner WUHAN UNIV OF TECH
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