Method for preparing silver telluride thermoelectric material by using ordinary pressure microwave synthesis method

A technology of microwave synthesis and thermoelectric materials, applied in the direction of binary selenium/tellurium compounds, etc., can solve the problems of uneven morphology and poor thermoelectric properties of alloy thermoelectric materials, and achieve excellent electrical properties, narrow particle size distribution, and simple process effects

Inactive Publication Date: 2014-04-02
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing silver telluride thermoelectric materials by atmospheric pressure microwave synthesis in order to solve the problems of inhomogeneous appearance and poor thermoelectric performance in the preparation of alloy thermoelectric materials by existing methods

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  • Method for preparing silver telluride thermoelectric material by using ordinary pressure microwave synthesis method
  • Method for preparing silver telluride thermoelectric material by using ordinary pressure microwave synthesis method
  • Method for preparing silver telluride thermoelectric material by using ordinary pressure microwave synthesis method

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specific Embodiment approach 1

[0014] Specific embodiment one: the method for preparing silver telluride thermoelectric material by a kind of atmospheric pressure microwave synthesis method of the present embodiment is to realize according to the following steps: one, Na 2 TeO 3 and ethylene glycol solvent at a mass volume ratio of 0.4-0.5g: 35mL at room temperature and at a speed of 500-600 rpm for 1-3min to obtain solution A; in addition, AgNO 3 and ethylene glycol solvent at a ratio of 0.6 to 0.7 g by mass volume: 10 mL, and stirred at a speed of 500 to 600 rpm for 1 to 3 minutes at room temperature to obtain solution B; Solution A is mixed evenly according to the ratio of mass volume ratio of 0.2g: 30-40mL, put it into the normal pressure microwave synthesizer, and react for 2-3min under the conditions of power 200-400W and temperature 170℃-180℃. Obtain solution C; 3. Mix the solution B obtained in step 1 with the solution C obtained in step 2 in a ratio of 10:30 to 40 by volume, and put it into an atm...

specific Embodiment approach 2

[0016] Specific implementation mode two: the difference between this implementation mode and the specific implementation mode one is: the Na described in step one 2 TeO 3 The mass volume ratio with ethylene glycol solvent is 0.422g: 35mL. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0017] Specific implementation mode three: the difference between this implementation mode and specific implementation modes one to two is: the AgNO described in step one 3 The mass volume ratio with ethylene glycol solvent is 0.68g: 10mL. Other steps and parameters are the same as those in Embodiments 1 to 2.

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Abstract

The invention discloses a method for preparing a silver telluride thermoelectric material by using an ordinary pressure microwave synthesis method and relates to a thermoelectric material and a preparation method thereof. The invention aims to solve the problems that process is complicated and reaction time is long in the process of preparing an alloy thermoelectric material with the existing method. The preparation method disclosed by the invention comprises the following steps of: 1, respectively dissolving Na2TeO3 and AgNO3 into a glycol solvent; 2, adding NaOH into the glycol solution of Na2TeO3 and then placing into an ordinary pressure microwave synthesis instrument, and reacting at a certain temperature until the solution is blue; 3, temporarily stopping the microwave synthesis instrument, pouring the glycol solution of AgNO3 prepared in advance into the blue solution, and then further reacting for a plurality of minutes; and 4, washing the obtained product with deionized water, and drying to obtain the silver telluride thermoelectric material. The method disclosed by the invention is low in reaction temperature, short in reaction time, simple in process and energy-saving, and is operated at ordinary pressure. The prepared material is uniform in powder particle, good in crystallization degree and high in yield. The method disclosed by the invention can be applied to the field of alloy thermoelectric materials.

Description

technical field [0001] The invention relates to a thermoelectric material and a preparation method, belonging to the field of alloy thermoelectric materials in functional materials; in particular to an Ag 2 Te thermoelectric material and its preparation method. Background technique [0002] Thermoelectric power generation and thermoelectric refrigeration are a kind of solid-state energy conversion methods. Compared with other energy conversion methods, they have the characteristics of no moving parts, no noise, easy miniaturization, safety and reliability, and can work in harsh environments. However, due to their conversion efficiency Low, so thermoelectric conversion devices are only used in limited occasions where reliability and convenience are more important than economy, and it is difficult to industrialize and promote to form a huge market. The key to improving the efficiency of thermoelectric conversion devices is to prepare high-performance thermoelectric materials....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/04
Inventor 裴健董秋实陈艳孙博王兴帅
Owner HARBIN INST OF TECH
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