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Preparation of Bi2Te3 thermoelectric compound nanopowder

A nano-powder and compound technology is applied in the field of preparation of Bi2Te3 thermoelectric compound nano-powder, which can solve problems such as being difficult to obtain, and achieve the effects of simple production equipment, uniform particle distribution, and simple and easy-to-control process.

Inactive Publication Date: 2008-12-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bi obtained by different preparation methods 2 Te 3 The microstructure and performance of compound materials are not the same, each has its advantages and disadvantages, but it is difficult to obtain high-purity and uniform Bi with an average particle size of less than 30nm. 2 Te 3 Nano powder

Method used

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  • Preparation of Bi2Te3 thermoelectric compound nanopowder
  • Preparation of Bi2Te3 thermoelectric compound nanopowder
  • Preparation of Bi2Te3 thermoelectric compound nanopowder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] like figure 1 As shown, a Bi 2 Te 3 A method for preparing a thermoelectric compound nanopowder, which comprises the steps of:

[0022] 1). Combine 4mmolTe and 8mmolNaBH 4 Place in a glass bottle with a rubber stopper to mix, and add 8ml of deionized water; then place the glass bottle in an ice-water bath and stir for 1 hour. During the reaction, the system communicates with the atmosphere through a small pinhole, and stirs to obtain NaHTe solution with clear color is A solution;

[0023] 2). Prepare Bi(NO at a concentration of 0.5mol / L 3 ) 3 ·5H 2 O aqueous solution 50ml, adjust pH value to be 12 (adjust pH value with alkali, as NaOH), be B solution;

[0024] 3). After degassing solution B for 3 minutes under an Ar gas atmosphere, add 6ml of A solution; heat to 80°C under an Ar gas atmosphere, and stir for 4 hours; the reaction principle is as follows:

[0025] 2Na + +4BH 4 - +2Te+7H 2 O=2HTe - +Na 2 B 4 o 7 ↓+14H 2 ↑

[0026] 3HTe - +2Bi 3+ +3OH -...

Embodiment 2

[0031] A Bi 2 Te 3 A method for preparing a thermoelectric compound nanopowder, which comprises the steps of:

[0032] 1). Te: NaBH 4 After selecting at a molar ratio of 1:2.0, mix in a glass bottle with a rubber stopper, and add deionized water, the ratio of deionized water to Te is 4ml:1g; then place the glass bottle in an ice-water bath to stir the reaction 0.5 hours, during the reaction, the system communicated with the atmosphere through a small pinhole, and stirred to obtain a colorless and transparent NaHTe solution, which was A solution;

[0033] 2). Prepare Bi(NO at a concentration of 0.05mol / L 3 ) 3 ·5H 2 O aqueous solution, adjust pH value to be 9 (adjust pH value with alkali, as NaOH), be B solution;

[0034] 3). After degassing the B solution for 3 minutes under the Ar gas atmosphere, then add the A solution according to the molar ratio of Bi ions in the B solution to Te ions in the A solution = 2.1:3; heat to 70°C under the Ar gas atmosphere , stirring and...

Embodiment 3

[0037] A Bi 2 Te 3 A method for preparing a thermoelectric compound nanopowder, which comprises the steps of:

[0038] 1). Te: NaBH 4After selection at a molar ratio of 1:2.1, mix in a glass bottle with a rubber stopper, and add deionized water, the ratio of deionized water to Te is 32ml:1g; then place the glass bottle in an ice-water bath to stir the reaction For 3 hours, the system communicated with the atmosphere through a small pinhole during the reaction, and stirred to obtain a colorless and transparent NaHTe solution, which was A solution;

[0039] 2). Prepare Bi(NO at a concentration of 0.5mol / L 3 ) 3 ·5H 2 O aqueous solution, adjust the pH value to 12 (adjust the pH value with alkali, such as NaOH), be the B solution;

[0040] 3). After degassing the B solution for 10 minutes under an Ar gas atmosphere, then add the A solution according to the molar ratio of Bi ions in the B solution to Te ions in the A solution = 2.3:3; heat to 90°C under an Ar gas atmosphere ...

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Abstract

The invention relates to a preparation method of Bi2Te3 thermoelectric compound nano-powder which is characterized by 1) mixing the Te and NaBH4 according to the mol ratio 1:2.0-2.1 of Te:NaBH4 and adding deionized water to obtain a solution of NaHTe as a solution A; 2)preparing a water solution of Bi(NO3)3.5H2O with a concentration of 0.05-0.5 mol / L and adjusting the pH value to 9-12 as a solution B; 3) charging the B solution after degassing under Ar atmosphere for 3-10 minutes into A solution, heating the mixture to 70-90 DEG C, stirring and reacting for 3-5 hours; 4) treating the product obtained from step 3) by deionized water ultrasound at normal temperature and washing and centrifuging the product 3 to 5 times; vacuum freezing and drying to obtain Bi2Te3 thermoelectricity compound nano-powder. The method has advantages of short reaction period, simple controlled technology, which is suitable for preparation in large scale. The Bi2Te3 thermoelectricity compound nano-powder prepared by the method has advantages of fine and uniform particle diameter and high purity.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, in particular to a Bi 2 Te 3 The preparation method of thermoelectric compound nanopowder. Background technique [0002] New energy materials are one of the important material foundations for the sustainable development of human beings in the 21st century. Low-dimensional thermoelectric materials are considered to be a new type of environmentally friendly new energy materials in the 21st century, showing broad application prospects in thermoelectric power generation and thermoelectric refrigeration. [0003] Bi 2 Te 3 Nano-based compounds are currently the best thermoelectric materials used near room temperature. Nanoizing its structure is an effective way to greatly reduce its lattice thermal conductivity, increase Seebeck coefficient, and then greatly improve thermoelectric figure of merit and conversion efficiency. However, in the past 50 years, the thermoelectric figure of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
Inventor 唐新峰郑艳丽柳伟张清杰
Owner WUHAN UNIV OF TECH
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