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Lead selenide coated lead telluride dendritic crystal composite and preparation method thereof

A composite material, lead telluride technology, applied in binary selenium/tellurium compounds, nanotechnology for materials and surface science, nanotechnology, etc., to achieve the effects of low temperature, high product purity, and simple process

Inactive Publication Date: 2014-01-01
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no related report on the composite material of lead selenide wrapped lead telluride dendrite

Method used

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  • Lead selenide coated lead telluride dendritic crystal composite and preparation method thereof
  • Lead selenide coated lead telluride dendritic crystal composite and preparation method thereof
  • Lead selenide coated lead telluride dendritic crystal composite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 1) The raw material Pb(CH 3 COO) 2 ·3H 2 O,TeO 2 and SeO 2 Dissolved in 30mL aqueous sodium hydroxide solution, Pb(CH 3 COO) 2 .3H 2 O,TeO 2 and SeO 2 The molar masses are 3mmol, 1.5mmol, 1.5mmol respectively, and 0.3g NaBH is added at the same time 4 as a reducing agent;

[0023] 2) Stir magnetically at room temperature for 30 minutes to mix the raw materials evenly to obtain a precursor solution for hydrothermal reaction;

[0024] 3) Transfer the precursor solution obtained in step 2) into a polytetrafluoroethylene-lined reaction kettle, then put the reaction kettle into an oven, and stop the reaction after keeping the temperature at 180°C for 20 hours;

[0025] 4) After the reaction temperature drops to room temperature, take out the reaction kettle, separate the precipitate, wash it with deionized water and absolute ethanol until neutral, and dry it at a constant temperature at 60°C to obtain pure lead selenide-coated telluride Lead composite powder.

[...

Embodiment 2

[0028] 1) The raw material Pb(CH 3 COO) 2 ·3H 2 O,TeO 2 and SeO 2 Dissolved in 30mL aqueous sodium hydroxide solution, Pb(CH 3 COO) 2 .3H 2 O,TeO 2 and SeO 2 The molar masses are 3mmol, 1.5mmol, 1.5mmol respectively, and 0.3g NaBH is added at the same time 4 as a reducing agent;

[0029] 2) Stir magnetically at room temperature for 30 minutes to mix the raw materials evenly to obtain a precursor solution for hydrothermal reaction;

[0030] 3) Transfer the precursor solution obtained in step 2) into a polytetrafluoroethylene-lined reaction kettle, then put the reaction kettle into an oven, and stop the reaction after keeping the temperature at 180°C for 18 hours;

[0031] 4) After the reaction temperature drops to room temperature, take out the reaction kettle, separate the precipitate, wash it with deionized water and absolute ethanol until neutral, and dry it at a constant temperature at 60°C to obtain pure lead selenide-coated telluride Lead composite powder.

Embodiment 3

[0033] 1) The raw material Pb(CH 3 COO) 2 ·3H 2 O,TeO 2 and SeO 2 Dissolved in 30mL aqueous sodium hydroxide solution, Pb(CH 3 COO) 2 .3H 2 O,TeO 2 and SeO 2 The molar masses are 3mmol, 1.5mmol, 1.5mmol respectively, and 0.3g NaBH is added at the same time 4 as a reducing agent;

[0034] 2) Stir magnetically at room temperature for 30 minutes to mix the raw materials evenly to obtain a precursor solution for hydrothermal reaction;

[0035] 3) Transfer the precursor solution obtained in step 2) into a polytetrafluoroethylene-lined reaction kettle, then put the reaction kettle into an oven, and stop the reaction after keeping the temperature at 180°C for 22 hours;

[0036] 4) After the reaction temperature drops to room temperature, take out the reaction kettle, separate the precipitate, wash it with deionized water and absolute ethanol until neutral, and dry it at a constant temperature at 60°C to obtain pure lead selenide-coated telluride Lead composite powder.

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Abstract

The invention provides a lead selenide coated lead telluride dendritic crystal composite and a preparation method thereof, and relates to a thermoelectric material. The lead selenide coated lead telluride dendritic crystal composite and the preparation method provided by the invention have the advantages that the preparation method is low in reaction temperature, simple in process and friendly to environment, and the synthesized powder is high in purity and good in morphology. The lead selenide coated lead telluride dendritic crystal composite is composed of lead telluride and lead selenide, wherein PbTe in a stoichiometric proportion is coated with PbSe in a stoichiometric proportion. The preparation method comprises the steps that Pb(CH3COO)2.3H2O, TeO2 and SeO2 are dissolved in a sodium hydroxide aqueous solution in the mol ratio of Pb: Te: Se=2: 1: 1; NaBH4 is added to the solution and mixed together to obtain a precursor solution; next, the precursor solution is transferred into a reaction kettle and preserved with heat for 18-22 h at a temperature ranging from 160 to 200 DEG C and then the reaction is stopped; after the reaction temperature is reduced to the room temperature, precipitate is separated out, washed until neutrality and dried at a constant temperature; finally, the lead selenide coated lead telluride dendritic crystal composite is obtained.

Description

technical field [0001] The invention relates to thermoelectric materials, in particular to a lead selenide-wrapped lead telluride dendrite composite material and a preparation method thereof. Background technique [0002] As the energy crisis, global warming and other issues become more and more serious, thermoelectric materials have received extensive attention. Thermoelectric materials are a new class of functional materials that utilize the Seebeck effect and the Peltier effect to convert thermal energy and electrical energy into each other. The application of thermoelectric devices does not require the use of transmission components. It has no noise, no waste, and no pollution to the environment. It is an environmentally friendly material and will play an increasingly important role in the field of clean and renewable energy. At present, thermoelectric materials have been widely used in mobile small power generation devices, small refrigeration devices, and portable ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04B82Y30/00B82Y40/00
Inventor 周健陈仲林孙志梅彭宇萨百晟潘元春
Owner XIAMEN UNIV
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