Polycrystalline SnSe2 low-cost thermoelectric material and preparation method thereof

A thermoelectric material, low-cost technology, applied in the fields of polycrystalline material growth, thermoelectric device junction lead-out materials, chemical instruments and methods, etc. Performance, effect of high mechanical strength

Inactive Publication Date: 2018-08-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, increasing the carrier concentration can increase the conductivity σ but at the same time reduce the Seebeck coefficient S and increase the electron thermal conductivity electron κ E , it is difficult to effectively improve the thermoelectric performance zT

Method used

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  • Polycrystalline SnSe2 low-cost thermoelectric material and preparation method thereof
  • Polycrystalline SnSe2 low-cost thermoelectric material and preparation method thereof
  • Polycrystalline SnSe2 low-cost thermoelectric material and preparation method thereof

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preparation example Construction

[0043] Polycrystalline SnSe 2 The preparation method of low-cost thermoelectric material preferably comprises the following steps:

[0044] (1) Vacuum packaging: according to the stoichiometric ratio, weigh the elemental Sn, Se and SnBr 2 Compounds, mixed uniformly as raw materials and vacuum-packed in quartz tubes;

[0045] (2) Melting reaction quenching: heating the quartz tube to make the raw materials fully react in the molten state, and then quenching to obtain the first ingot;

[0046] (3) heat treatment and quenching: the first ingot is vacuum-packed in another quartz tube, quenched and cooled after heat treatment to obtain the second ingot;

[0047] (4) Pressurized sintering: the second ingot is ground into powder, placed in a graphite mold, sintered by vacuum and high temperature hot pressing, and then cooled to obtain a bulk material, which is the polycrystalline SnSe 2 Low-cost thermoelectric materials.

[0048] As a preferred embodiment of the present invention...

Embodiment 1

[0055] A polycrystalline SnSe 2 Low-cost thermoelectric material with the chemical formula SnBr x Se 2-x , x=0~0.05, in this embodiment by taking x=0, 0.002, 0.004, 0.006, 0.008, 0.02 and 0.05 (when x=0, the chemical formula is SnSe 2 , when x=0.002, 0.004, 0.006, 0.008, 0.02 and 0.05, that is, by doping different concentrations of Br to optimize the carrier concentration), according to the following preparation method, obtain different carrier concentrations of SnBr x Se 2-x Block material:

[0056] (1) According to different values ​​of x, it is composed of SnBr x Se 2-x (x=0~0.05) stoichiometric ratio Weigh the elemental raw material tin Sn, selenium Se with a purity greater than 99.99%, and the compound tin dibromide SnBr with a purity greater than 98% 2 , place the raw material in a quartz tube, and seal the quartz tube under vacuum.

[0057] (2) Suspend the quartz tube containing the raw materials in a high-temperature muffle furnace, slowly raise the temperature ...

Embodiment 2

[0072] Compared with Example 1, most of them are the same, except that in step (2) of this example: Slowly heat up to 1023K at a rate of 150K / h, and keep warm at a temperature of 1023K for 10h.

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Abstract

The invention relates to a polycrystalline SnSe2 low-cost thermoelectric material and a preparation method thereof. The thermoelectric material has a chemical formula of SnBrxSe(2-x), wherein x = 0-0.05; the preparation method of the thermoelectric material comprises the steps of: adopting a simple substance and SnBr2 as raw materials, performing proportioning according to the stoichiometric ratioin the chemical formula, performing vacuum packaging, melt reaction quenching and heat treatment quenching, grinding the quenched mixture into powder, performing vacuum high-temperature hot-pressingsintering, and performing slow cooling to obtain a block material which is the thermoelectric material. Compared with the prior art, the invention prepares the high-performance anisotropic thermoelectric material with low thermal conductivity and a high thermoelectric property, and the method is explored for preparing the anisotropic thermoelectric material which has high density, high mechanicalstrength and a high thermoelectric property; the thermoelectric material can reach a thermoelectric peak value at a temperature of 750 K, the zT in the direction parallel to hot pressing is 0.65, thezT in the direction perpendicular to hot pressing is 0.40, and therefore the thermoelectric material is a kind of thermoelectric material which has great potential.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a polycrystalline SnSe 2 Low-cost thermoelectric materials and methods for their preparation. Background technique [0002] Energy crisis and environmental pollution have become two major problems that need to be solved urgently in the world. Energy conservation and efficient use of energy occupy a prominent position in my country's medium and long-term energy development strategy. Thermoelectric energy conversion technology is a technology that drives the directional movement of electrons inside materials through temperature differences to achieve direct conversion of thermal energy and electrical energy. The working medium of this technology is electrons. Compared with traditional heat engines, it has outstanding advantages such as no transmission parts, no noise, all solid state, zero emissions and zero maintenance requirements. It is considered as a kind of gree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/48C30B28/02H01L35/16
CPCC30B28/02C30B29/48H10N10/852
Inventor 裴艳中李文吴怡萱
Owner TONGJI UNIV
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