Thermoelectric material and preparation method thereof

A technology of thermoelectric materials and raw materials, which is applied in the direction of thermoelectric device node lead-out materials, thermoelectric device manufacturing/processing, etc., which can solve the problems of poor thermoelectric performance of thermoelectric materials, damage to the crystal structure of bismuth selenide, and affect the thermoelectric properties of materials, etc. , to achieve the effects of reducing ionized impurity scattering, high Seebeck coefficient, and reducing thermal conductivity

Inactive Publication Date: 2020-04-28
DONGGUAN TIANYI MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, Kulsi et al. doped bismuth selenide with nickel (Ni), reducing its resistivity and significantly reducing thermal conductivity
However, the Seebeck coefficient decreases with the decrease of Ni concentration, and excessive doping easily destroys the original crystal structure of bismuth selenide, thus affecting the thermoelectric properties of the material.
It can be seen that the existing Bi 2 Se 3 Thermoelectric materials have poor thermoelectric properties

Method used

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  • Thermoelectric material and preparation method thereof
  • Thermoelectric material and preparation method thereof
  • Thermoelectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of thermoelectric material of this embodiment, comprises the raw material composition of following molar ratio:

[0040] Bismuth nitrate pentahydrate (Bi(NO 3 ) 3 .5H 2 O, 98%) 0.8mmol

[0041] Selenium powder (99%) 1.5mmol

[0042] Cerium nitrate hexahydrate (Ce(NO 3 ) 3 .6H 2 O, 99.99%) 0.2mmol

[0043] Ethanolamine (≥99.0%) 0.59mmol

[0044] Anhydrous 2-methoxyethanol (99.8%) 0.91 mmol.

[0045] The preparation method of the thermoelectric material of this embodiment includes the following steps:

[0046] S1 Mix anhydrous 2-methoxyethanol and ethanolamine with selenium powder, and stir continuously for 15 minutes to obtain a mixture;

[0047] S2 will Bi(NO 3 ) 3 .5H 2 O and Ce(NO 3 )3 .6H 2 O was added to the mixture of step S1 respectively, stirred for 3h to obtain a suspension;

[0048] S3 Transfer the suspension in step S2 to a 50ml Teflon autoclave, and react overnight at 180°C to obtain a black precipitate;

[0049] S4 Collect the black p...

Embodiment 2

[0051] The thermoelectric material of this embodiment includes the following molar ratios of raw material components:

[0052] Bismuth nitrate pentahydrate (Bi(NO 3 ) 3 .5H 2 O, 98%) 0.85mmol

[0053] Selenium powder (99%) 1.35mmol

[0054] Cerium nitrate hexahydrate (Ce(NO 3 ) 3 .6H 2 O, 99.99%) 0.15mmol

[0055] Ethanolamine (≥99.0%) 0.53mmol

[0056] 2-Methoxyethanol (99.8%) 0.82 mmol.

[0057] The preparation method of the thermoelectric material of this embodiment includes the following steps:

[0058] S1 Mix anhydrous 2-methoxyethanol and ethanolamine with selenium powder, and stir continuously for 30 minutes to obtain a mixture;

[0059] S2 will Bi(NO 3 ) 3 .5H 2 O and Ce(NO 3 ) 3 .6H 2 O was added to the mixture of step S1 respectively, stirred for 2.5h to obtain a suspension;

[0060] S3 Transfer the suspension in step S2 to a 50ml Teflon autoclave, and react overnight at 200°C to obtain a black precipitate;

[0061] S4 Collect the black precipitate ...

Embodiment 3

[0063] The thermoelectric material of this embodiment includes the following molar ratios of raw material components:

[0064] Bismuth nitrate pentahydrate (Bi(NO 3 ) 3 .5H 2 O, 98%) 0.925mmol

[0065] Selenium powder (99%) 1.65mmol

[0066] Cerium nitrate hexahydrate (Ce(NO 3 ) 3 .6H 2 O, 99.99%) 0.075mmol

[0067] Ethanolamine (≥99.0%) 0.65mmol

[0068] 2-Methoxyethanol (99.8%) 1 mmol.

[0069] The preparation method of the thermoelectric material of this embodiment includes the following steps:

[0070] S1 Mix anhydrous 2-methoxyethanol and ethanolamine with selenium powder, and stir continuously for 10 minutes to obtain a mixture;

[0071] S2 will Bi(NO 3 ) 3 .5H 2 O and Ce(NO 3 ) 3 .6H 2 O was added to the mixture of step S1 respectively, stirred for 2h to obtain a suspension;

[0072] S3 Transfer the suspension in step S2 to a 50ml Teflon autoclave, and react overnight at 170°C to obtain a black precipitate;

[0073] S4 Collect the black precipitate fro...

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Abstract

The invention provides a thermoelectric material and a preparation method thereof, and belongs to the technical field of thermoelectric materials. The thermoelectric material comprises the following raw material components according to the molar weight ratio: 0.8 to 0.925 mmol of bismuth nitrate pentahydrate, 1.35 to 1.65 mmol of selenium powder, 0.075 to 0.2 mmol of cerium nitrate hexahydrate, 0.53 to 0.65 mmol of ethanolamine and 0.82 to 1 mmol of 2-methoxyethanol; according to the thermoelectric material, Ce < 3 + > of cerium nitrate hexahydrate equivalently replaces a doping mode of Bi < 3+ > in bismuth selenide obtained by selenium powder and bismuth nitrate pentahydrate; interdependence of the seebeck coefficient and the conductivity of the cerium-doped bismuth selenide thermoelectric material is eliminated, and the obtained thermoelectric material has the characteristics of high conductivity, high seebeck coefficient, high quality factor and the like.

Description

technical field [0001] The invention relates to the technical field of thermoelectric materials, in particular to a thermoelectric material and a preparation method thereof. Background technique [0002] A thermoelectric material is a functional material that can convert heat energy and electric energy. Its performance is characterized by a dimensionless measure, that is, the quality factor. Its expression is: zT=S2σT / κ T , where S represents the Seebeck coefficient (that is, thermal power), σ represents the electrical conductivity, T represents the temperature, and κ T Indicates the overall thermal conductivity of the material. In order to improve the thermoelectric properties of materials, some methods tend to obtain thermoelectric materials through defect engineering, grain boundary modification, dislocation density, nanostructure, etc. While the Seebeck coefficient and electrical conductivity are central factors defining the thermoelectric properties of any material, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34
CPCH10N10/852H10N10/01
Inventor 肖艳君尹东明叶丽红尹贺
Owner DONGGUAN TIANYI MOTOR
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