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Nanofiber based flexible high performance thermoelectric material and preparation method thereof

A technology of nanofibers and thermoelectric materials, applied in the field of new energy thermoelectric conversion materials, can solve the problems of increasing the Seebeck coefficient, reducing the thermal conductivity of the lattice, and unable to solve the problem of thermal shock stress, which is easy to operate, repeat, and produce. Simple and convenient equipment, easy to promote and apply

Inactive Publication Date: 2012-11-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, thermoelectric materials are limited to nanostructures to greatly reduce their lattice thermal conductivity, increase Seebeck coefficient, and increase the ZT value at a certain temperature, but subsequent hot pressing and SPS sintering into bulk materials are required. , still unable to solve the stress problem caused by thermal shock

Method used

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  • Nanofiber based flexible high performance thermoelectric material and preparation method thereof
  • Nanofiber based flexible high performance thermoelectric material and preparation method thereof
  • Nanofiber based flexible high performance thermoelectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In a 50ml Erlenmeyer flask, add 0.7g polyacrylonitrile (Mw=80,000) into 10ml N,N-dimethylformamide, stir at 60°C for 8h until the solution is completely clear, then cool to room temperature; 0.3g of silver nitrate was added to the above-mentioned polymer mixed solution, and stirred vigorously for 1h under the condition of avoiding light to make it evenly mixed.

[0044] Put the mixed solution into the glass spinneret of the electrospinning equipment. The inner diameter of the tube head of the glass spinneret is 1mm, the aluminum sleeve is used as the anode, and the aluminum foil is used as the cathode plate to accept the product. The distance between the two poles is 20cm. A voltage of 20KV was applied between the two electrodes for electrospinning, so that a composite nanofiber membrane of polyacrylonitrile and silver nitrate was collected on the cathode.

[0045] In a 50ml beaker, add 0.16g of sodium hydroxide and 20ml of ethylene glycol, stir well until the solution ...

Embodiment 2

[0051] Solution preparation, spinning process and silver nitrate reduction are consistent with Example 1.

[0052] Dissolve 0.5 g of silver nitrate in 30 ml of deionized water, add ammonia water dropwise under rapid stirring until the solution becomes clear, and soak the nanofiber membrane in the solution. Another 30 ml of deionized water was taken to dissolve 3.0 g of potassium sodium tartrate, and the solution was transferred to the solution soaked with nanofiber membranes. After stirring at room temperature for 5 h, the nanofiber membranes were taken out, washed with deionized water and dried.

[0053] The in-situ redox and vulcanization process is consistent with that of Example 1.

[0054] At 340K, the Seebeck coefficient reaches a maximum of 1100μV / K, and the maximum value of ZT reaches about 0.66.

Embodiment 3

[0056] Solution preparation, spinning process and silver nitrate reduction are consistent with Example 1.

[0057] Dissolve 1.0 g of silver nitrate in 30 ml of deionized water, add ammonia water dropwise under rapid stirring until the solution becomes clear, and soak the nanofibrous membrane in the solution. Another 30 ml of deionized water was taken to dissolve 3.0 g of potassium sodium tartrate, and the solution was transferred to the solution soaked with nanofiber membranes. After stirring at room temperature for 1 h, the nanofiber membranes were taken out, washed with deionized water and dried.

[0058] Prepare 250ml of ferric chloride aqueous solution with a concentration of 0.003M, soak the nanofiber membrane in the solution and let it stand for 40min, take out the fiber membrane, wash it with deionized water and dry it.

[0059] Take a vacuum desiccator, add 30ml of concentrated sulfuric acid (mass fraction 98%) to the bottom, place the nanofiber membrane on the support...

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Abstract

The invention belongs to the technical field of a thermoelectric conversion material of novel energy, and in particular relates to a flexible semiconductor nanostructural material with high thermoelectric figure of merit based on electrostatic spun nanofiber and a preparation method of the material. The preparation method comprises the steps of taking high polymer and silver nitrate compound nanofiber as a substrate, depositing a silver shell on the surface of the fiber by an electroless method after reducing silver nitrate, and carrying oxidation reduction in situ and vulcanization to obtain a high polymer / silver sulfide nuclear shell nanofiber material. The nanofiber based thermoelectric material prepared by the method has ultrahigh Seebeck coefficient and thermoelectric figure of merit as well as good flexibility, which cannot be compared with conventional thermoelectric materials. For example, the Seebeck coefficient of polyacrylonitrile / silver sulfide nuclear shell nanofiber material reaches more than 103, the maximum thermoelectric figure of merit reaches 0.9 at temperature of 340K, and the original flexibility of the polyacrylonitrile nanofiber is maintained.

Description

technical field [0001] The invention belongs to the technical field of new energy thermoelectric conversion materials, and specifically relates to a semiconductor nanostructure material with flexibility and high thermoelectric value based on electrospun nanofibers and a preparation method thereof. Background technique [0002] As the shortage of traditional fossil energy, the greenhouse effect and environmental pollution become increasingly serious, thermoelectric conversion, as a green energy technology with broad application prospects, has attracted widespread attention. Thermoelectric materials are a class of functional materials that use the movement of carriers inside solids to realize direct mutual conversion of thermal energy and electrical energy. They have the advantages of no moving parts, no noise, and no pollution. The use of thermoelectric materials can not only generate electricity or refrigeration in some special needs fields, such as space exploration, but al...

Claims

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Application Information

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IPC IPC(8): H01L35/24H01L35/34B82Y30/00B82Y40/00
Inventor 王策王兆杰李振宇姜婷婷徐秀茹王威
Owner JILIN UNIV
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