a kind of ag 2 Ultrafast synthesis method for x bulk thermoelectric materials

Abstract

The present invention discloses a kind of Ag for the first time 2 An ultra-fast synthesis method of X bulk thermoelectric materials, which uses Ag and X simple substances as raw materials, mixes them uniformly and applies high pressure at room temperature, the reaction and densification are completed in one step, and Ag is prepared 2 X bulk thermoelectric material, wherein X is Se or Te. Ag prepared by the present invention 2 Se, Ag 2 The density of the Te block is above 97%, and the preparation time involved is short and the process is simple. At the same time, this method solves the problem of volatilization of elements during the high-temperature synthesis of selenide and telluride, and realizes precise control of composition and microstructure. The thermoelectric performance of the obtained product is better than that of the traditional preparation method, and the obtained Ag 2 Se's ZT max =0.65@107℃,Ag 2 Te's ZT max =0.7@127°C. The present invention is Ag 2 Se and Ag 2 The large-scale preparation and large-scale application of Te thermoelectric materials have laid a good foundation.

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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