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

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....

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