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High-effect potassium-doped lead telluride-lead sulfide alloy thermoelectric material and preparation method thereof

A technology of thermoelectric materials and potassium doping, which is applied in the direction of thermoelectric device node lead-out materials, thermoelectric device manufacturing/processing, etc., can solve the problems of thermoelectric materials that need to be improved, and achieve the improvement of thermoelectric performance and energy conversion efficiency. The effect of high thermoelectric performance figure of merit and high energy conversion efficiency

Active Publication Date: 2014-09-24
深圳热电新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the current research on thermoelectric materials still needs to be improved.

Method used

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  • High-effect potassium-doped lead telluride-lead sulfide alloy thermoelectric material and preparation method thereof
  • High-effect potassium-doped lead telluride-lead sulfide alloy thermoelectric material and preparation method thereof
  • High-effect potassium-doped lead telluride-lead sulfide alloy thermoelectric material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1: Preparation of potassium-doped lead telluride-lead sulfide alloy material

[0043] Raw materials: Pb (99.99%, American Elements, USA), Te (99.999%, 5N Plus, Canada), S (99.999%, 5N Plus, Canada), K (99.999%, Sigma-Aldrich, USA) .

[0044] Preparation steps: in a nitrogen atmosphere glove box, according to the molar ratio of Pb, Te, S and K is 0.995:0.7:0.3:0.005, high-purity Pb, Te, S and K raw materials are melted on the carbon coating Mix well in the quartz tube, then, adjust the pressure in the quartz tube to be about 10 -4 Then, the carbon-coated fused silica tube was sealed, and then, under the condition of 1323K, the sealed carbon-coated fused silica tube containing the raw material mixture was smelted for 10 hours, and then the furnace was cooled to room temperature to obtain an ingot, and subsequently, The resulting ingot was crushed in a mortar to a grain size of less than 5mm 3 , and then, the obtained particles were mechanically milled to a g...

Embodiment 2

[0045] Embodiment 2: Preparation of potassium-doped lead telluride-lead sulfide alloy material

[0046] Potassium-doped lead telluride-lead sulfide alloy material was prepared according to the method of Example 1, except that the molar ratio of Pb, Te, S and K was 0.99:0.7:0.3:0.01.

Embodiment 3

[0047] Embodiment 3: Preparation of potassium-doped lead telluride-lead sulfide alloy material

[0048] Potassium-doped lead telluride-lead sulfide alloy material was prepared according to the method of Example 1, except that the molar ratio of Pb, Te, S and K was 0.985:0.7:0.3:0.015.

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Abstract

The invention provides a high-effect potassium-doped lead telluride-lead sulfide alloy thermoelectric material and a preparation method thereof. The high-effect potassium-doped lead telluride-lead sulfide alloy thermoelectric material is composed as shown in the formula: Ky (lower coordinate)PB(1-y) (lower coordinate)Te (1-x) (lower coordinate) Sx (lower coordinate), wherein x ranges from 0.1 to 0., and y ranges from 0.05 to 005 to 0.05. The high-effect potassium-doped lead telluride-lead sulfide alloy thermoelectric material has relatively high seebeck coefficient and conductivity and small heat conductivity, and therefore, high thermoelectric performance optimum value and energy conversion efficiency are high; when x is 0.3 and y is 0.025, the thermoelectric performance optimum value (ZT) within a wide temperature range from 673 to 923k is more than 2; the average thermoelectric performance optimum value is 1.56 under the temperature gradient from 300 to 900k, and the corresponding energy conversion efficiency is up to 20.7%.

Description

technical field [0001] The invention relates to the field of thermoelectric materials, in particular to a high-efficiency potassium-doped lead telluride-lead sulfide alloy thermoelectric material and a preparation method thereof. Background technique [0002] Fossil energy is currently the most important energy consumed in the world. In 2006, the proportion of fossil energy in the energy consumed in the world was as high as 87.9%, and the proportion in my country was as high as 93.8%. However, with the continuous mining of human beings, the depletion of fossil energy is inevitable, and most of the fossil energy will be exhausted in this century. In addition, this kind of one-time fossil energy-based development and utilization has brought us convenience but also caused great environmental pollution, which has severely challenged the sustainable development of human society. Therefore, how to deal with the energy crisis caused by the imminent depletion of disposable fossil e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34H10N10/852H10N10/01
Inventor 何佳清武海军
Owner 深圳热电新能源科技有限公司
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