Cu-S-Se ternary thermoelectric material and preparation method thereof

Abstract

The invention relates to a Cu-S-Se ternary thermoelectric material and a preparation method of the material, belonging to the technical field of energy material. The method for preparing the Cu-S-Se ternary thermoelectric material is characterized in that high-pure metal simple substance Cu powder, high-pure Se powder and high-pure S powder are taken as raw materials and are proportioned according to the chemical general formula Cu 1.8 S 1-x Se x (wherein x is the mole fraction of Se component element and is more than or equal to 0.01 and less than or equal to 0.99); and the compound powder is synthesized by a mechanical alloying method, and a block is prepared by spark plasma sintering. The method can be used for preparing the Cu-S-Se ternary thermoelectric material simply, conveniently and accurately, and the Cu-S-Se ternary thermoelectric material has the excellent thermoelectric property at the medium temperature area.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a Cu-S-Se ternary thermoelectric material and a preparation method thereof, and relates to mechanical alloying and discharge plasma sintering processes. Background technique [0002] With the development of science and technology and productivity, human's demand for energy is increasing day by day. The use of a large amount of fossil fuels has caused serious environmental pollution and is facing the danger of depletion. Therefore, it is particularly necessary to develop new energy sources and improve the comprehensive utilization rate of existing energy sources. Thermoelectric materials can directly convert heat and electricity to realize thermoelectric power generation, effectively use energy and protect the environment. The thermoelectric performance is characterized by the dimensionless thermoelectric figure of merit ZT, ZT=TS 2 σ / κ, S is Seebeck coeffic...

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Problems solved by technology

But the biggest problem facing this material is that although it has a high electrical conductance / thermal conductance ratio, its Seebeck coefficient is very low, lower than 100μVK -1 , so to make Cu 1.8 The most critical factor for S to become a thermoelectric material that can be used in practice is to increase its Seebeck coefficient.

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