CoSb3/graphene composite material, and preparation method and application thereof

A composite material and graphene technology, which is applied to thermoelectric devices with thermal changes in dielectric constant, etc., can solve the problems of weakened phonon scattering mechanism, easy agglomeration and sintering of nanomaterials, and achieves effective scattering, low cost, and improved thermoelectricity. performance effect

Inactive Publication Date: 2012-10-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanomaterials are easy to agglomerate and sinter during heat treatment, thus weakening the scattering mechanism for phonons

Method used

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  • CoSb3/graphene composite material, and preparation method and application thereof
  • CoSb3/graphene composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) The analytically pure SbCl 3 and CoCl 2 ·6H 2 O, according to the ratio of Co:Sb atomic ratio of 1:3, mixed in absolute ethanol to obtain CoSb 3 The meter concentration is the mixed solution of 0.015mol / L, and the mixed solution volume is 80 milliliters.

[0033] 2) Add 25 mg of GO to the mixture in step 1) and fully ultrasonically disperse it, then place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and then add 1.1 g of reducing agent NaBH to the solution 4, then seal immediately.

[0034] 3) Heating the reactor to 180°C and reacting for 24 hours.

[0035] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a composite material powder 0.52 grams, the weight percentage of graphene in the ...

Embodiment 2

[0038] 1) Analytical pure Sb(NO 3 ) 3 and CoC 2 o 4 2H 2 O, according to the proportion of Co:Sb atomic ratio of 1:3 and mixed in deionized water to obtain CoSb 3 The meter concentration is the mixed solution of 0.03mol / L, and the mixed solution volume is 80 milliliters.

[0039] 2) Add 30 mg of GO to the mixture in step 1) and fully ultrasonically disperse it, then place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and add 2.8 g of reducing agent KBH to the solution 4 , then seal immediately.

[0040] 3) Heating the reactor to 160°C and reacting for 48 hours.

[0041] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a composite material powder 1.0 grams, the weight percentage of graphene in t...

Embodiment 3

[0044] 1) will analyze pure SbF 3 and CoSO 4 ·7H 2 O is blended in anhydrous ethylene glycol according to the ratio of Co:Sb atomic ratio of 1:3 to obtain CoSb 3 The meter concentration is the mixed solution of 0.09mol / L, and the mixed solution volume is 80 milliliters.

[0045] 2) Add 31 mg of GO to the mixture in step 1) and fully ultrasonically disperse it, then place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and add 4.3 g of reducing agent NaBH to the solution 4 , then seal immediately.

[0046] 3) Heating the reactor to 200°C and reacting for 36 hours.

[0047] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a composite material powder 3.1 grams, the weight percentage of graphene in the...

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Abstract

The invention discloses a CoSb3 / graphene composite material which is composed of nano CoSb3 particles and graphene. Under the dispersion, loading and isolation actions of the graphene, the sintering of the nano CoSb3 particles can be effectively prevented in the heat treatment process to keep the effective scattering of nanocrystals for phonons, and thus, the invention has important meaning for enhancing thermoelectric properties of the CoSb3 material. The composite material can be used as a thermoelectric material. The invention also discloses a preparation method of the composite material by a one-step hydrothermal process or one-step solvothermal process, which has the advantages of simple technique, low cost, short cycle, low energy consumption and the like.

Description

technical field [0001] The invention relates to the field of thermoelectric composite materials, in particular to a CoSb 3 / Graphene composite materials and their preparation methods and applications. Background technique [0002] A thermoelectric material is a semiconductor material that directly converts electrical energy and thermal energy through the movement of carriers (electrons or holes). When there is a temperature difference between the two ends of the thermoelectric material, the thermoelectric material can convert heat energy into electrical energy output; or conversely, when a current is passed through the thermoelectric material, the thermoelectric material can convert electrical energy into heat energy, absorbing heat at one end and releasing heat at the other end. Thermoelectric materials have broad application prospects in the fields of power generation or refrigeration. Thermoelectric power generation devices using thermoelectric materials can be used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L37/02
Inventor 谢健屠芳芳刘双宇朱铁军曹高劭赵新兵
Owner ZHEJIANG UNIV
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