Bismuth telluride-molybdenum diselenide nanosheet as well as preparation method and application thereof

A technology of molybdenum diselenide and bismuth telluride, which is applied in nanotechnology, nanotechnology, binary selenium/tellurium compounds, etc., can solve the problems of poor thermoelectric performance and stability, and materials are easily oxidized, and achieve excellent thermoelectric performance, Reduce the overall concentration and mobility, improve the effect of phonon scattering

Active Publication Date: 2022-04-29
INST OF CHEM ENG GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to solve the problems of traditional N-type thermoelectric materials such as easy oxidation, poor thermoelectric performance and stability, and provide a bismuth telluride-di Molybdenum Selenide Nanosheets

Method used

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  • Bismuth telluride-molybdenum diselenide nanosheet as well as preparation method and application thereof
  • Bismuth telluride-molybdenum diselenide nanosheet as well as preparation method and application thereof
  • Bismuth telluride-molybdenum diselenide nanosheet as well as preparation method and application thereof

Examples

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Embodiment 1

[0045] A preparation method of bismuth telluride-molybdenum diselenide nanosheets, comprising the following steps:

[0046] 1) Dissolve 0.96g of sodium molybdate dihydrate in 50mL of deionized water, and stir until completely dissolved to obtain a sodium molybdate solution;

[0047] 2) Add 2.0g of bismuth telluride and 0.85g of selenium dioxide into the sodium molybdate solution in step 1), fully stir for 5 minutes, then add 2.7g of sodium sulfite as a reducing agent, and fully stir for 5 minutes to obtain a precursor solution. Transfer the precursor solution to a 100mL polytetrafluoroethylene hydrothermal reactor;

[0048] 3) Put the polytetrafluoroethylene hydrothermal reaction kettle at 200°C for 24 hours, cool it down to room temperature naturally after the reaction, wash it with deionized water three times and dry it at 60°C to obtain a solid; put the solid into the tube In a type furnace, calcined at 300°C for 1 h in a nitrogen atmosphere, and cooled to obtain bismuth t...

Embodiment 2

[0055] Compared with Example 1, the main difference is that powdered selenium is used as the selenium source, and potassium molybdate is used as the molybdenum source.

[0056] A preparation method of bismuth telluride-molybdenum diselenide nanosheets, comprising the following steps:

[0057] 1) Dissolve 1.37g potassium molybdate in 50mL deionized water, stir until completely dissolved to obtain potassium molybdate solution;

[0058]2) Add 2.0g of bismuth telluride and 0.75g of selenium powder into the potassium molybdate solution in step 1), fully stir for 5 minutes, then add 1.3g of sodium sulfite as a reducing agent, and fully stir for 5 minutes to obtain a precursor solution. The precursor solution was transferred to a 100mL polytetrafluoroethylene hydrothermal reactor;

[0059] 3) Put the polytetrafluoroethylene hydrothermal reaction kettle at 200°C for 24 hours, cool it down to room temperature naturally after the reaction, wash it with deionized water three times and d...

Embodiment 3

[0062] Compared with Example 1, the main difference is that hydrazine hydrate is used as reducing agent.

[0063] A preparation method of bismuth telluride-molybdenum diselenide nanosheets, comprising the following steps:

[0064] 1) Dissolve 0.96g of sodium molybdate dihydrate in 50mL of deionized water, and stir until completely dissolved to obtain a sodium molybdate solution;

[0065] 2) Add 2.0g of bismuth telluride and 0.85g of selenium dioxide into the sodium molybdate solution in step 1), fully stir for 5 minutes, then add 15mL of hydrazine hydrate as a reducing agent, and fully stir for 5 minutes to obtain a precursor solution. Transfer the precursor solution to a 100mL polytetrafluoroethylene hydrothermal reactor;

[0066] 3) Put the polytetrafluoroethylene hydrothermal reaction kettle at 200°C for 24 hours, cool it down to room temperature naturally after the reaction, wash it with deionized water three times and dry it at 60°C to obtain a solid; put the solid into ...

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Abstract

The invention discloses a bismuth telluride-molybdenum diselenide nanosheet as well as a preparation method and application thereof. The bismuth telluride-molybdenum diselenide nanosheet is an N-type thermoelectric material with bismuth telluride as a substrate and the molybdenum diselenide nanosheet as a barrier layer, and has the advantages of high absolute value of Seebeck coefficient and good thermoelectric performance. The preparation method of the bismuth telluride-molybdenum diselenide nanosheet comprises the steps that a molybdenum source, bismuth telluride, a selenium source and a reducing agent are dispersed in water for a hydrothermal reaction, then a solid product is separated out and calcined, and the bismuth telluride-molybdenum diselenide nanosheet is obtained. The preparation method of the bismuth telluride-molybdenum diselenide nanosheet has the advantages of simplicity and convenience. The bismuth telluride-molybdenum diselenide nanosheet and the preparation method thereof can be applied to the fields of environmental protection, thermoelectricity and energy storage materials.

Description

technical field [0001] The invention relates to the field of thermoelectric materials, in particular to a bismuth telluride-molybdenum diselenide nanosheet and a preparation method and application thereof. Background technique [0002] Energy is an important issue related to the development of human society. According to statistics, more than 50% of the heat energy generated in industrial production is dissipated in the air meaninglessly, and at the same time, a large amount of energy is consumed to cool buildings and industrial production equipment. Therefore, how to effectively recycle waste heat from industrial production has become an urgent problem to be solved in the scientific and industrial circles. [0003] Thermoelectric materials are materials that can realize direct mutual conversion of heat energy and electric energy, and have shown great application and development potential in the fields of waste heat recovery and green refrigeration. Thermoelectric material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04H01L35/14H01L35/16B82Y15/00B82Y30/00B82Y40/00
CPCC01B19/007B82Y30/00B82Y40/00B82Y15/00C01P2004/80C01P2002/72C01P2006/40H10N10/851H10N10/852Y02P20/129
Inventor 曾炜李龙斌石超生
Owner INST OF CHEM ENG GUANGDONG ACAD OF SCI
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