Ultrafast synthetic method of Ag2X block thermoelectric material

Abstract

The invention discloses an ultrafast synthetic method of a Ag2X block thermoelectric material. The ultrafast synthetic method is characterized in that Ag and an X elementary substance are taken as raw materials, high pressure is applied at the normal temperature after the raw materials are mixed uniformly, the mixed materials react and are densified by one step, and the Ag2X block thermoelectric material is prepared, wherein X is Se or Te. The densities of Ag2Se and Ag2Te blocks prepared by the ultrafast synthetic method are above 97%; the relevant preparation time is short, and a technology is simple; in addition, the problem of element volatilization in high-temperature synthetic processes of selenide and telluride is solved; accurate control on components and a microstructure is realized; the thermoelectric properties of obtained products are superior to those of products prepared by the traditional preparation method; ZTmax of obtained Ag2Se is equal to 0.65@107 DEG; ZTmax of obtained Ag2Te is equal to 0.7@127 DEG; and the ultrafast synthetic method lays a good foundation for large-scale preparation and large-scale application of Ag2Seand Ag2Te thermoelectric materials.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, in particular to an Ag 2 Ultrafast Synthetic Method for X Bulk Thermoelectric Materials. Background technique [0002] In the past ten years, energy and environmental issues have gradually become prominent, and the energy crisis and environmental crisis have attracted increasing attention. At present, about 70% of the energy consumed in the world every year is wasted in the form of waste heat. If the waste heat can be effectively recycled, the problem of energy shortage will be greatly alleviated. Thermoelectric materials can directly convert thermal energy into electrical energy. They have the advantages of no transmission parts, small size, no noise, no pollution, and good reliability. They have great application prospects in the recycling of automobile waste heat and industrial waste heat power generation. The conversion efficiency of thermoelectric materials is d...

AI Technical Summary

Problems solved by technology

Currently, compound Ag 2 Se, Ag 2 The synthesis methods of Te mainly focus on hydrothermal method, solvothermal method, etc., which prepare Ag in solution. 2 Se, Ag 2 Te's method often requires complex reaction process and strict reaction conditions

What's more regrettable is that some toxic chemical reagents need to be used, which consumes time and energy and pollutes the environment

However, the preparation by conventional long-term high-temperature melting method and high-temperature solid-state reaction method requires strict equipment requirements and consumes energy, which is likely to cause the absence of Se or Te, and it is difficult to accurately control the composition.

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