A temperature-controllable oxide thermoelectric material, a preparing method thereof and applications of the oxide thermoelectric material

A technology of thermoelectric materials and oxides, which is applied in the field of temperature-controllable oxide thermoelectric materials and its preparation, can solve the problems of unsatisfactory thermoelectric performance of carbon nanotubes, low Seebeck coefficient of carbon nanotubes, high thermal conductivity, etc. The effect of short, low cost and high Seebeck coefficient

Inactive Publication Date: 2016-08-17
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermoelectric properties of carbon nanotubes are not ideal. The main reason is that although carbon nanotubes have high electrical conductivity, their thermal conductivity is also high, and the Seebeck coefficient of carbon nanotubes is generally not high.

Method used

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  • A temperature-controllable oxide thermoelectric material, a preparing method thereof and applications of the oxide thermoelectric material
  • A temperature-controllable oxide thermoelectric material, a preparing method thereof and applications of the oxide thermoelectric material
  • A temperature-controllable oxide thermoelectric material, a preparing method thereof and applications of the oxide thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 2.9630g MnCl 2 .4H 2 O, 0.8744g ZnCl 2 , 11.5619g FeCl 3 .6H 2 O to make a metal chloride salt solution with a total metal ion concentration of 1mol / L; weigh 6.8438g NaOH to make a 1mol / L solution and add it to form Mn 0.7 Zn 0.3 Fe 2 o 4 The carbon nanotubes of 0wt%, 2wt%, 4wt%, 6wt%, 8wt%, 10wt% of mass; NaOH solution is heated up to 80 ℃, feeds high-purity nitrogen, makes NaOH solution be in high-purity nitrogen atmosphere, then The chloride salt solution was slowly added dropwise into the continuously stirring NaOH solution, and then the mixed solution was heated to 100° C. in a high-purity nitrogen atmosphere, and reacted in a high-purity nitrogen atmosphere for 1 hour. After the reaction was completed, the suspension was allowed to stand at room temperature for 5 hours, and then the precipitate was washed to neutrality with deionized water and ethanol during suction filtration, and vacuum-dried at 80°C for 10 hours to obtain 0wt%, 2wt%, 4wt%, 6wt%, 8wt%, 1...

Embodiment 2

[0043] 2.9630g MnCl 2 .4H 2 O, 0.8744g ZnCl2 , 11.5619g FeCl 3 .6H 2 O to make a metal chloride salt solution with a total metal ion concentration of 1mol / L; weigh 6.8438g NaOH to make a 1mol / L solution and add it to form Mn 0.7 Zn 0.3 Fe 2 o 4 2wt% carbon nanotubes by mass; the NaOH solution is heated up to 80° C., and high-purity nitrogen gas is passed into it, so that the NaOH solution is in a high-purity nitrogen atmosphere, and then the chloride salt solution is slowly added dropwise to the continuously stirring NaOH solution, Then the mixed solution was heated to 100° C. in a high-purity nitrogen atmosphere, and reacted in a high-purity nitrogen atmosphere for 1 hour. After the reaction was completed, the suspension was allowed to stand at room temperature for 5 hours, and then the precipitate was washed with deionized water and ethanol until neutral during suction filtration, and dried in vacuum at 80°C for 10 hours to obtain carbon nanotube-Mn 0.7 Zn 0.3 Fe 2 ...

Embodiment 3

[0047] The preparation of the powder is the same as in Example 2. Put the obtained composite powder into a graphite mold for spark plasma sintering. The heating rate is 100°C / min, and the final temperature is 700°C for 10min, and the pressure is 60MPa to obtain the carbon nanotube-Mn 0.7 Zn 0.3 Fe 2 o 4 composite material. The thermoelectric properties of the samples were tested at room temperature to 700°C.

[0048] The scanning electron microscope picture of the sample prepared in this example is shown in Fig. 4(b), and it can be seen from the figure that the grain size of the sample is about 200nm.

[0049] The thermoelectric performance of the sample prepared in this example varies with temperature curve as Figure 5-9 As shown, it can be seen from the figure that the conductivity of the composite material at 700°C is 963.419S / m, the Seebeck coefficient is -184.271μV / K, and the power factor is 3.271×10 -5 W / mK 2 , thermal conductivity=1.583W / mK, ZT=0.02011.

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Abstract

A temperature-controllable oxide thermoelectric material, a preparing method thereof and applications of the oxide thermoelectric material are disclosed. The oxide thermoelectric material is prepared by preparing metal salts containing Mn<2+>, Fe<3+> and Zn<2+> into a solution, adding dropwise the solution into an alkali solution of carbon nanotubes, reacting, performing suction filtration, washing to obtain carbon nanotube-Mn<1-x>Zn<x>Fe2O4 composite powder, and finally sintering, wherein the objective of precise temperature controlling is achieved by controlling the adding amount of the carbon nanotubes, and the x is less than 1. The composite material formed by adding the carbon nanotubes into a manganese-zinc-iron ferrite has increased conductivity, a high Seebeck coefficient and low thermal conductivity. The composite material of the carbon nanotubes and the manganese-zinc-iron ferrite can control the temperature rising situation of the manganese-zinc-iron ferrite under actions of an alternating magnetic field through controlling the adding amount of the carbon nanotubes, thus achieving high thermoelectric performance and achieving a precise temperature controlling objective. The oxide thermoelectric material, the method and the applications have advantages of a simple process, a low cost, simple operation, short preparation time, a small grain size of the prepared material, and the like.

Description

technical field [0001] The invention relates to a temperature-controllable oxide thermoelectric material and a preparation method thereof, belonging to the technical field of biological materials, oxide thermoelectric materials and their preparation. Background technique [0002] Thermoelectric materials, as a new type of functional material that uses the repeated circulation of carriers inside a solid to achieve direct mutual conversion between thermal energy and electrical energy, can use various thermal energies such as solar energy, automobile exhaust heat, industrial waste heat, and CPU dissipation to directly convert into Electric energy, and thermoelectric devices have the advantages of small size, long life, no noise, no pollution, etc. The energy conversion efficiency of thermoelectric materials usually uses the dimensionless figure of merit ZT(=S 2 σT / κ), where S is the Seebeck coefficient, σ is the electrical conductivity, T is the absolute temperature, and κ is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26
CPCC04B35/2658C04B2235/422
Inventor 孙康宁张书品李爱民刘昭君
Owner SHANDONG UNIV
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