A kind of preparation method of GES-based thermoelectric material

Abstract

The invention discloses a preparation method of a GeS-based thermoelectric material, which belongs to the technical field of energy materials. The present invention adopts solid state reaction method (SSR) combined with discharge plasma (SPS) sintering process to prepare, uses Ge powder, S powder and doping element A as raw material, and described A is Se or Te, according to the general chemical formula GeS 1‑x A x (0≤x≤0.05) for proportioning, using low-temperature solid-state reaction to prepare precursor powder with uniform composition, and then combining with spark plasma (SPS) sintering process to prepare polycrystalline GeS-based thermoelectric material block. The polycrystalline GeS thermoelectric material prepared by the present invention has a power factor of 0.02-4 μWm along the vertical SPS pressure direction ‑ 1 K ‑2 , the thermal conductivity is 1.3‑2.5Wm ‑1 K ‑1 . The power factor in the direction of parallel SPS pressure is 0.01‑2μWm ‑1 K ‑2 , the thermal conductivity is 0.5‑1.5Wm ‑1 K ‑1 . The preparation of polycrystalline GeS bulk thermoelectric materials by solid-state reaction method combined with SPS method has the characteristics of simple process, easy operation, low requirements on equipment and preparation environment, and low sintering temperature. The prepared polycrystalline GeS thermoelectric materials may be widely used in the fields of thermoelectric power generation and thermoelectric refrigeration.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a preparation method of a GeS-based thermoelectric material. Background technique [0002] Thermoelectric materials can realize mutual conversion of thermal energy and electrical energy through Seebeck effect and Peltier effect, and realize thermoelectric power generation and thermoelectric refrigeration. Thermoelectric devices composed of N-type and P-type thermoelectric materials have the advantages of small size, no noise, no moving parts, no pollution, high reliability and long life. They are used in industrial waste heat utilization, fluorine-free refrigeration, aerospace, high-performance receiving It has broad application prospects in the fields of devices and sensors. The thermoelectric properties of materials can be measured by the dimensionless thermoelectric figure of merit ZT = α 2 σT / κ, where α is the Seebeck coefficient, σ is the electrical co...

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Problems solved by technology

[0004] So far, polycrystalline GeS bulk thermoelectric materials with good crystallinity and dense structure have been prepared in combination with the SPS sintering process described in the present invention in advance by using solid state reaction method.

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