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Method for rapidly synthetizing Cu2Se-based thermoelectric material through autocatalysis at low temperature

A thermoelectric material and self-catalysis technology, which can be used in binary selenium/tellurium compounds, photovoltaic power generation, metal selenide/tellurium compounds, etc. The effect of precise composition, optimized thermoelectric performance

Active Publication Date: 2019-01-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, 221°C is not a temperature that is very easy to achieve, and it still takes a certain amount of energy to maintain this temperature in real commercial applications. In addition, Se becomes more volatile after it exceeds the melting point, and it is difficult to control the final product very precisely. Composition, for semiconductors, precise control of composition is the key to ensure controllable material properties

Method used

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  • Method for rapidly synthetizing Cu2Se-based thermoelectric material through autocatalysis at low temperature
  • Method for rapidly synthetizing Cu2Se-based thermoelectric material through autocatalysis at low temperature
  • Method for rapidly synthetizing Cu2Se-based thermoelectric material through autocatalysis at low temperature

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Experimental program
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Effect test

Embodiment 1

[0030] A self-catalyzed low-temperature rapid synthesis of Cu 2 The method for Se-based thermoelectric material, comprises the steps:

[0031] 1) Using Cu powder and Se powder as raw materials, according to the stoichiometric ratio of Cu 2(1+x) Se, x = 3% weighed, a total of 7g;

[0032] 2) Mix the weighed raw materials evenly in an agate mortar to obtain the mixed raw materials, then put them into a steel mold, use a pressure of 6 MPa on the tablet press and keep the pressure for 5 minutes to make a Φ12mm green body, and then put the green body into a test tube , and then the test tube was placed in an oil bath at 130°C for 3 minutes, and it was found that the green body turned from dark brown to black, and the green body was taken out for XRD analysis (see figure 2 ), the resulting XRD pattern and Cu 2 The Se standard card fits, indicating the formation of Cu 2 Se single-phase compound, indicating that a small amount of Cu excess can catalyze the synthesis of Cu from Cu...

Embodiment 2～5

[0037] A self-catalyzed low-temperature rapid synthesis of Cu 2 The method for Se-based thermoelectric material, comprises the steps:

[0038] 1) Using Cu powder and Se powder as raw materials, according to the stoichiometric ratio of Cu 2(1+x) Se, x are respectively 0.5%, 1%, 2%, 5% to weigh, respectively 7g;

[0039] 2) Mix the weighed raw materials in an agate mortar evenly to obtain the mixed raw materials, then put them into a steel mold, use a pressure of 6 MPa on the tablet press and keep the pressure for 5 minutes to make a Φ12mm green body, and then put the green body into In the test tube, the test tube was placed in an oil bath at a temperature of 130°C for 3 minutes. It was found that the green body turned from dark brown to black, and the green body was taken out for XRD analysis (see figure 2), the resulting XRD patterns are all consistent with Cu 2 The Se standard cards match, indicating that Cu was generated 2 Se single-phase compound;

[0040] 3) with st...

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Abstract

The invention develops a method for rapidly synthetizing a Cu2Se-based thermoelectric material through autocatalysis at low temperature. The method comprises the following steps: with Cu powder and Sepowder as raw materials, treating powder formed by mixing according to the stoichiometric ratio of Cu2(1+x)Se(x>0) within the short time by using the autocatalysis of excessive Cu to obtain a Cu2Se-based single-phase compound; and the compound powder is simply cold-pressed at room temperature to obtain a high-density block which has high thermoelectric performance. The raw materials used in the method are low in cost, the process is super simple, the preparation time is super short, and a good foundation is laid for preparation and large-scale application of the Cu2Se-based thermoelectric material.

Description

technical field [0001] The invention belongs to the field of material preparation science, in particular to a self-catalyzed low-temperature rapid synthesis of Cu 2 Approaches to Se-based thermoelectric materials. Background technique [0002] Thermoelectric conversion technology uses thermoelectric materials to directly convert heat energy and electric energy. It has the characteristics of small system size, high reliability, no emission of pollutants, wide applicable temperature range, and effective use of low-density energy. It is used in industrial waste heat and automobile exhaust waste heat. It has a wide range of applications in the fields of recycling, high-precision temperature control and special power supply technology. The conversion efficiency of thermoelectric materials is determined by the dimensionless thermoelectric figure of merit ZT (ZT=α 2 σT / κ, where α is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and T is...

Claims

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Application Information

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IPC IPC(8): C01B19/04
CPCC01B19/007C01P2006/40C01P2006/32C01P2002/72C01P2004/03Y02E10/50
Inventor 唐新峰杨东旺黎俊张敏柳伟鄢永高
Owner WUHAN UNIV OF TECH
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