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Nanoparticle composite bismuth telluride-based thermoelectric material and preparation method thereof

A technology of nano-particles and thermoelectric materials, which is applied in the fields of thermoelectric device junction lead-out material and thermoelectric device manufacturing/processing, etc. Achieve good chemical stability, reduce lattice thermal conductivity, and optimize thermoelectric performance

Active Publication Date: 2011-04-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the reported nanoparticle composite thermoelectric materials also have certain problems.
For example, while nanoparticles enhance phonon scattering and reduce the thermal conductivity of the lattice, the carriers are also scattered to a certain extent, thus reducing the electrical conductivity of the material.
Especially when the composite second phase is nanoparticles with poor conductivity, the electrical transport properties of the matrix are usually negatively affected; and when the metal nanophase with relatively good conductivity is used as the second phase, it may be due to the metal The poor thermal stability of itself affects the chemical stability of the matrix material, and these problems will limit the further improvement of the thermoelectric performance of the material

Method used

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  • Nanoparticle composite bismuth telluride-based thermoelectric material and preparation method thereof
  • Nanoparticle composite bismuth telluride-based thermoelectric material and preparation method thereof
  • Nanoparticle composite bismuth telluride-based thermoelectric material and preparation method thereof

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Effect test

Embodiment 1

[0028] In the matrix material composed of bismuth Bi, tellurium Te and selenium Se elements, zinc-aluminum alloy oxide with nanoparticles is mixed to form N-type Bi composited with zinc-aluminum alloy oxide nanoparticles 2 (Te, Se) 3 A crystalline thermoelectric material in which zinc-aluminum-aluminum oxide nanoparticles account for 1.5% of the matrix material. The specific preparation method is as follows:

[0029] With the elements Bi, Te, Se as the matrix raw materials, according to the N-type Bi 2 (Te, Se) 3 The composition ratio of the matrix element powder is weighed with a total amount of 50g, and then 0.75g of nano-powder of zinc-aluminum alloy oxide is weighed according to 1.5% of the total mass of the matrix element powder as the second phase; the second phase and the matrix element powder Mix them into a quartz glass tube, vacuum seal the quartz glass tube at 0.01Pa, place it in a swing furnace, heat and melt it at 700°C for 2 hours, so that the second phase and...

Embodiment 2

[0032] In the matrix material composed of bismuth Bi, tellurium Te and antimony Sb elements, zinc-aluminum alloy oxide with nanoparticles is mixed to form a P-type (Bi, Sb) composite of zinc-aluminum alloy oxide nanoparticles. 2 Te 3Crystalline thermoelectric materials in which zinc-aluminum-aluminum oxide nanoparticles account for 2% of the matrix material. The specific preparation method is as follows:

[0033] With the elements Bi, Te, Sb as the base material, according to the P type (Bi, Sb) 2 Te 3 The composition ratio of the matrix element powder is weighed with a total amount of 50g, and then 1g of nano-powder of zinc-aluminum alloy oxide is weighed according to 2% of the total mass of the matrix element powder as the second phase; the second phase is mixed with the matrix element powder Put it into a quartz glass tube, vacuum seal the quartz glass tube at 0.01Pa, then place it in a swing furnace, heat and melt it at 700°C for 1 hour, so that the second phase and the...

Embodiment 3

[0036] In the matrix material composed of bismuth Bi, tellurium Te and antimony Sb elements, zinc-aluminum alloy oxide with nanoparticles is mixed to form a P-type (Bi, Sb) composite of zinc-aluminum alloy oxide nanoparticles. 2 Te 3 A crystalline thermoelectric material in which zinc-aluminum-aluminum oxide nanoparticles account for 10% of the matrix material.

[0037] The specific preparation method is as follows:

[0038] With Bi, Te, Sb as matrix elements, according to P type (Bi, Sb) 2 Te 3 The proportion of ingredients weighed a total of 50g matrix element powder; Zn, Al, Bi 2 o 3 As the precursor of zinc-aluminum alloy oxide, the precursor undergoes oxidation-reduction reaction to obtain zinc-aluminum alloy oxide. According to the zinc-aluminum alloy oxide accounts for 10% of the total mass of matrix element powder, the required precursor Zn, Al and Bi 2 o 3 The respective mass, and weigh the precursor Zn, Al and Bi of this mass 2 o 3 ; mix the precursor and ma...

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Abstract

The invention discloses a nanoparticle composite bismuth telluride-based thermoelectric material and a preparation method thereof. In the nanoparticle composite bismuth telluride-based thermoelectric material, a bismuth telluride thermoelectric material is used as a substrate, and nanoparticles are mixed in the substrate, wherein the nanoparticles are electrical-conduction oxide nanoparticles. Compared with the prior art, since the electrical-conduction oxide nanoparticles are used as a second phase and compounded with a bismuth telluride-based alloy substrate; on one hand, the electrical-conduction oxide nanoparticles can enhance the selective scattering to low-frequency phonons so that the crystal lattice heat conductivity of the bismuth telluride-based thermoelectric material can be effectively reduced, and on the other hand, the electrical-conduction oxide nanoparticles can improve the electrical conductivity of the material on the other hand, therefore, an integral regulation and control effect improves the thermoelectric figure of merit ZR of the bismuth telluride-based thermoelectric material so that the thermoelectric property of the bismuth telluride-based thermoelectric material is optimized.

Description

technical field [0001] The invention relates to the field of thermoelectric materials, in particular to a nanoparticle composite bismuth telluride-based thermoelectric material and a preparation method thereof. Background technique [0002] Thermoelectric materials are a class of functional materials that directly couple and convert thermal energy and electrical energy through the Seebeck effect and Peltier effect of semiconductor materials. With the increasingly severe energy crisis and environmental pollution, thermoelectric materials have attracted widespread attention due to their advantages such as no pollution, no noise, small size, long life, and precise control. [0003] Bismuth telluride-based alloy is one of the thermoelectric materials with the best performance near room temperature so far, and has very broad application prospects in thermoelectric refrigeration and thermoelectric power generation. At present, the main bottleneck restricting the development and a...

Claims

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Application Information

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IPC IPC(8): H01L35/16H01L35/34
Inventor 蒋俊张婷陈建敏熊震李炜张秋实许高杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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