Method for preparing Ag nano granule compound CoSb3-based pyroelectric material

A technology of thermoelectric materials and nanoparticles, which is applied in the direction of conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve the problems that nanoparticles are not easy to disperse, and achieve simple and easy preparation methods and excellent thermoelectricity. The effect of increasing the value and decreasing the thermal conductivity

Inactive Publication Date: 2010-08-04
TSINGHUA UNIV
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Problems solved by technology

[0004] The object of the present invention is to provide a kind of Ag nanoparticle composite CoSb 3 The preparation method of based thermoelectric materials, in order to overcome the shortcomings of the traditional technology that directly adding nanoparticles is not easy to disperse, and realize the effect of reducing the thermal conductivity without affecting the electrical conductivity, and finally improving the thermoelectric figure of merit

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  • Method for preparing Ag nano granule compound CoSb3-based pyroelectric material
  • Method for preparing Ag nano granule compound CoSb3-based pyroelectric material
  • Method for preparing Ag nano granule compound CoSb3-based pyroelectric material

Examples

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Embodiment 1

[0025] Example 1: AgNO 3 Dissolved in ethanol to prepare AgNO with a molar concentration of 0.01mol / L 3 ethanol solution, 4.3g of doped CoSb 3 The mechanically alloyed powder (particle size3 Ethanol solution 0.4ml. The completed solution is dripped into and dried into the pre-sintered body, and then put into the spark plasma sintering equipment for sintering. The sintering temperature is 450° C., the holding time is 8 minutes, the sintering pressure is 30 MPa, and the heating rate is 100° C. / min. Finally get Ag and CoSb 3 The composite material with a molar ratio of 0.0004:1 has a density of about 93%. The room temperature resistivity and Seebeck coefficient of the composite material are 12.4μΩm and -146μV / K, respectively.

Embodiment 2

[0026] Example 2: AgNO 3 Dissolved in ethanol to prepare AgNO with a molar concentration of 0.05mol / L 3 ethanol solution, 4.3g of doped CoSb 3 The base thermoelectric material mechanically alloyed powder (particle size 3 Ethanol solution 0.4ml. The completed solution is dripped into and dried into the pre-sintered body, and then put into the spark plasma sintering equipment for sintering. The sintering temperature is 450° C., the holding time is 3 minutes, the sintering pressure is 70 MPa, and the heating rate is 100° C. / min. Finally get Ag and CoSb 3 The composite material with a molar ratio of 0.002:1 has a density of about 92%. The room temperature resistivity and Seebeck coefficient of the composite material are 12.2μΩm and -146μV / K, respectively.

Embodiment 3

[0027] Example 3: AgNO 3 Dissolve in ethanol to prepare AgNO with a molar concentration of 0.1mol / L 3 ethanol solution, 4.3g of doped CoSb 3 The base thermoelectric material mechanically alloyed powder (particle size 3 Ethanol solution 0.4ml. The completed solution is dripped into and dried into the pre-sintered body, and then put into the spark plasma sintering equipment for sintering. The sintering temperature is 450° C., the holding time is 5 minutes, the sintering pressure is 50 MPa, and the heating rate is 100° C. / min. Finally get Ag and CoSb 3 The composite material with a molar ratio of 0.004:1 has a density of about 94%. figure 1 It is the TEM photo of the composite composite material. From the figure we can see that the CoSb 3 The grain size of the matrix is ​​~100 nm, while the size of the Ag particles located in the inter-grain space is about 10-20 nm. figure 2 , image 3 with Figure 4 Ag / CoSb were compared separately 3 Composite and pure CoSb 3 The res...

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Abstract

The invention discloses a preparation method for Ag nano-particles CoSb3 matrix thermoelectric material. In the invention, ethanol solution of AgNO3 is dropped into CoSb3 pre-sintering powder compacted by a chemical soaking method. The surface of powder particles on thermoelectric material is coated with AgNO3 solution membrane by utilizing the soaking effect, then dried quickly to promote the shrinkage, precipitate nanometer particles and dispersed on the surface of CoSb3 powder particles, and finally fast sintered by the spark plasma sintering technology, the decomposition of AgNO3 is promoted at high temperature, and the thermoelectric composite material with Ag nano-particles which are dispersed homogeneously on the grain boundary of CoSb3 matrix is obtained. The method overcomes the disadvantage that nano-particles are not easy to disperse by direct adding in a traditional way. Ag has high electrical conductivity, therefore, the adding of Ag nano-particles can lower the thermal conductivity based on no reduction of electrical conductivity, and improve thermoelectric figure of merit ZT.

Description

technical field [0001] The present invention particularly relates to a kind of CoSb compounded with metal nanoparticles 3 The base thermoelectric material belongs to the technical field of new energy materials. Background technique [0002] With the increasingly serious energy and environmental problems, people are paying more and more attention to the reuse of a large amount of waste heat released from industrial production, transportation and residents' lives. Thermoelectric power generation devices based on the Seebeck effect have irreplaceable advantages in the reuse of these large, low-grade, and dispersed waste heat sources. Therefore, the development of medium-temperature thermoelectric materials with high thermoelectric figure of merit ZT (ZT=Tα 2 / ρλ, where T is the temperature, α is the Seebeck coefficient, ρ is the electrical resistivity, and λ is the thermal conductivity), which is of great significance for alleviating existing energy and environmental problems...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16H01B13/00H01B1/16
Inventor 李敬锋刘玮书张波萍赵立东
Owner TSINGHUA UNIV
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