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Cu-Se-S system thermoelectric material and preparation method thereof

A thermoelectric material, cu-se-s technology, applied in the direction of thermoelectric device junction lead-out material, thermoelectric device manufacturing/processing, polycrystalline material growth, etc., can solve the problem of difficult to obtain alloy materials, and achieve thermoelectric performance improvement , the effect of improving the thermoelectric performance

Active Publication Date: 2019-05-03
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The invention provides a method for preparing a Cu-Se-S system thermoelectric material to solve the problem that it is difficult to obtain an alloy material containing both cuprous sulfide and cuprous selenide in the prior art

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  • Cu-Se-S system thermoelectric material and preparation method thereof
  • Cu-Se-S system thermoelectric material and preparation method thereof
  • Cu-Se-S system thermoelectric material and preparation method thereof

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preparation example Construction

[0033] The preparation process of the above-mentioned Cu-Se-S system thermoelectric material includes the following steps:

[0034] (1) The prepared Cu:Se:S molar ratio is 2:(1-x):x sulfur powder, selenium powder and copper oxide powder are added in the ethylenediamine solvent, form mixed solution, sulfur powder, selenium The purity of powder and copper oxide powder is not less than 99.9%, after adding reducing agent and NaOH in the mixed solution, reducing agent is hydrazine hydrate (N 2 h 4 ·H 2 (0), so that the pH value of the mixed solution is 12 to 14, and the hydrothermal reaction is carried out at a temperature of 100 to 200 ° C. The time of the hydrothermal reaction is 6 to 12 hours, and the single-phase Cu-Se-S alloy powder and residual solution.

[0035] The reaction equation in the above hydrothermal reaction is:

[0036] 2CuO+2N 2 h 4 ·H 2 O→Cu 2 O+2NH 4 ++H 2 O+N 2 ↑ (1)

[0037] Se+2N 2 h 4 ·H 2 O→Se 2- +2NH 4 +N 2 +H 2 O↑ (2)

[0038] 2CuO+2N ...

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Abstract

The invention relates to the technical field of thermoelectric materials, and specifically discloses a Cu-Se-S system thermoelectric material. The molar ratio of Cu, Se and S in the material is 2:(1-x):x, wherein 0<x<1; and the material is composed of a Cu2Se phase and a Cu2S phase obtained by in-situ phase separation of single-phase Cu-Se-S ternary alloy, wherein the Cu2S phase is dispersed in the Cu2Se phase, the grain size of the Cu2Se phase is 200-500 nm, and the size of the Cu2S phase is 10-50 nm. An alloy material containing both Cu2S and Cu2Se is obtained by employing a technical schemeof the thermoelectric material, and thermoelectric properties of Cu-Se-S system alloy are greatly improved.

Description

technical field [0001] The invention relates to the technical field of thermoelectric materials, in particular to a Cu-Se-S system thermoelectric material and a preparation method thereof. Background technique [0002] The performance of thermoelectric materials is characterized by the dimensionless thermoelectric figure of merit ZT, ZT=σS 2 T / κ, where σ, κ, S and T represent electrical conductivity, thermal conductivity, Seebeck coefficient and absolute temperature, respectively. The T value is the average of the temperature of the hot end and the cold end. The higher the ZT value, the better the thermoelectric performance of the material, and a high ZT value requires the presence of high Seebeck coefficient, high electrical conductivity and low thermal conductivity in the material at the same time, but due to the coupling between these parameters Improving the ZT value has been a challenge for a long time. PbTe-PbS material has a very low thermal conductivity due to its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34B22F3/105B22F9/24C22C9/00C30B1/10C30B29/46H10N10/852H10N10/01
Inventor 葛振华唐赟乔冯晶
Owner KUNMING UNIV OF SCI & TECH
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