A kind of preparation method of n-type SNSE-based thermoelectric nanomaterial

A nanomaterial and thermoelectric technology, which is applied in the manufacture/processing of thermoelectric devices, and lead-out wire materials of thermoelectric devices, can solve problems such as the instability of SnSe materials, reduce lattice thermal conductivity, and achieve excellent overall electrical performance. The effect of optimizing the power factor

Active Publication Date: 2021-05-04
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

The volatilization of Sn and Se can be suppressed by the solution method, but the SnSe material obtained by the solution method is unstable at high temperature

Method used

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  • A kind of preparation method of n-type SNSE-based thermoelectric nanomaterial
  • A kind of preparation method of n-type SNSE-based thermoelectric nanomaterial

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Using SnCl 2 (mass percentage purity is 98%), Se powder (purity is 99.999%), bismuth 2-ethylhexanoate, NaOH (mass percentage content > 96%), NaBH 4 (mass percentage content is 98%), anhydrous ethylenediamine (mass percentage content > 99%), deionized water are used as reaction raw materials, and solid medicine is stored in the glove box, and all raw materials are purchased from the market without secondary treatment Use directly.

[0027] The complete preparation process is as follows: NaOH (3g) and NaBH 4 (1g) was dissolved in a mixture of 120ml deionized water and 40ml anhydrous ethylenediamine, and then transferred to a mixture containing Se powder (10mmol), SnCl 2 (9.9mmol) and bismuth 2-ethylhexanoate (0.1mmol) in a flask, the flask was connected to the Schlank reaction line, after the oxygen removal operation, the temperature was raised to 150°C with an oil bath, and the reaction was carried out for 2h. After the reaction was completed, it was cooled in an ice-...

Embodiment 2

[0029] On the basis of Example 1, adjust SnCl 2 The dosage of bismuth 2-ethylhexanoate is 9.8mmol, and the dosage of bismuth 2-ethylhexanoate is 0.2mmol to obtain an n-type SnSe-based thermoelectric nanomaterial with a Bi-doped molar percentage of 2%.

Embodiment 3

[0031] On the basis of Example 1, adjust SnCl 2 The dosage of bismuth 2-ethylhexanoate is 9.7mmol, and the dosage of bismuth 2-ethylhexanoate is 0.3mmol to obtain an n-type SnSe-based thermoelectric nanomaterial with a Bi-doped molar percentage of 3%.

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Abstract

The invention provides a preparation method of an n-type SnSe-based thermoelectric nanomaterial, which adopts a chemical synthesis method, uses bismuth 2-ethylhexanoate as a Bi source, and adds Bi element into the SnSe-based thermoelectric material, and the Bi element is mixed with The molar percentage of miscellaneous is 1~5%. By adopting the technical solution of the present invention, n-type doping can be effectively realized by using metal organic bismuth ethylhexanoate as a dopant, and an n-type conductive SnSe-based thermoelectric material that is still stable at 500° C. is obtained; by effectively Bi doping can adjust the carrier concentration, thereby optimizing the power factor of SnSe-based thermoelectric materials. Through nano-synthesis, it can increase phonon scattering and reduce lattice thermal conductivity, thereby optimizing its Z T value, and its comprehensive electrical properties are superior to Bi-doped SnSe-based thermoelectric materials obtained by traditional smelting methods.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials, and in particular relates to a preparation method of an n-type SnSe-based thermoelectric nanometer material. Background technique [0002] With the rapid advancement of industrialization, global energy consumption continues to grow, and people's demand for fossil energy such as coal, oil, and natural gas is increasing. At the same time, the environmental pollution caused by the combustion of fossil fuels has seriously affected people's work and life. Therefore, improving the efficiency of traditional energy use and developing new types of renewable energy is an urgent problem to be solved by human beings. According to U.S. Department of Energy estimates of primary energy consumption, more than 60 percent of energy is ultimately released to the environment as waste heat. Therefore, research on the reuse of waste heat is of great significance for improving energy efficiency, redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/34H01L35/16
CPCH10N10/852H10N10/01
Inventor 张倩李孝芳陈辰曹峰刘兴军
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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