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PBSE-based thermoelectric material compounded with Sr and Na and its preparation method

A technology of composite materials and thermoelectric materials, which is applied in the field of thermoelectric device material preparation, can solve problems such as low conversion efficiency, low conversion efficiency of thermoelectric materials, and restrictions on the application of thermoelectric devices, and achieve reduced thermal conductivity, short sintering time, and improved thermoelectric performance Effect

Inactive Publication Date: 2018-07-10
SHANGHAI UNIV
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Problems solved by technology

[0007] Although thermoelectric devices made of thermoelectric materials have broad application prospects, the conversion efficiency of thermoelectric materials is very low, only about 10%, which is far lower than the 35% conversion efficiency of ordinary heat engines, which greatly limits the use of thermoelectric devices. application
However, theoretical calculations show that there is no upper limit to the ZT value of thermoelectric materials, and their energy conversion efficiency can be infinitely close to the Carnot cycle efficiency.

Method used

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  • PBSE-based thermoelectric material compounded with Sr and Na and its preparation method
  • PBSE-based thermoelectric material compounded with Sr and Na and its preparation method
  • PBSE-based thermoelectric material compounded with Sr and Na and its preparation method

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Embodiment Construction

[0027] Preferred embodiments of the present invention are described in detail as follows:

[0028] In this example, see Figure 1 to Figure 10 , a preparation method of a PbSe-based thermoelectric material doped with Sr and Na, comprising the steps of:

[0029] a. In the glove box according to the composite material composition Pb 0.88 Sr 0.10 Na 0.02 The molar component ratio of the stoichiometric ratio of Se weighed 5.3873g, 0.2595g, 0.15g and 2.3383g of the elemental materials of Sr, Na, Pb and Se respectively, and then weighed the elemental materials of Sr, Na, Pb and Se After the materials are evenly mixed, put them into a graphite crucible, seal the graphite crucible into a quartz tube with a propane flame, then put the vacuum-sealed graphite crucible into a well furnace, and then mix the Sr, Na, Pb and Se in the graphite crucible Material heat treatment smelting and calcination, first heat up at 5°C / min to the melting temperature of 1050°C for 24 hours, then cool do...

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Abstract

The invention discloses a PbSe-based thermoelectric material compositely doped with Sr and Na and a preparation method thereof. First, Pb, Sr, Na and Se are weighed according to the stoichiometric ratio of Pb0.98-xSrxNa0.02Se, and vacuum sealing is carried out after mixing Smelting completes the phase formation stage of the material phase. Grind the heat-treated sample and put it into a graphite mold, and use the rapid hot-pressing sintering technology to make the powder into a block sample to obtain a Pb0.98-xSrxNa0.02Se thermoelectric material. Compared with the traditional hot-pressing sintering, the present invention , has the advantages of uniform heating, fast heating speed, short sintering time, etc., and the performance of sintered samples changes significantly. After Sr and Na doping, the thermal conductivity of the material is greatly reduced, the Seebeck coefficient is increased, and a thermoelectric material with a higher ZT value is obtained.

Description

technical field [0001] The invention relates to a functional composite material and a preparation method thereof, in particular to a PbSe-based thermoelectric composite material and a preparation method thereof, which are applied in the technical field of thermoelectric device material preparation. Background technique [0002] Thermoelectric material is a functional material that utilizes the movement of carriers inside a solid to realize direct mutual conversion of thermal energy and electrical energy. With the development of economy, people's demand for energy is getting higher and higher. Today, the world's energy structure is dominated by fossil energy. However, fossil energy as the main energy source is non-renewable energy. If you use a little, you will use a little less. However, due to the relationship between their own storage capacity and utilization rate, these energy sources cannot fully meet the needs of human production and life. The emergence of thermoelect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/16H10N10/852
Inventor 骆军陈晖张继业曾李骄开张玉
Owner SHANGHAI UNIV
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