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Preparation of Bi2Sr2Co2Oy thermoelectric compounds

A compound and thermoelectric technology, applied in the direction of cobalt compounds, bismuth compounds, chemical instruments and methods, etc., can solve problems such as difficult to obtain uniform distribution, and achieve the effect of easy to obtain raw materials, simple equipment, and high purity

Inactive Publication Date: 2010-06-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, for Bi 2 Sr 2 co 2 o y The preparation methods of polycrystalline compounds are mainly high-temperature solid state reaction (Solid state reaction, SSR) and sol-gel method (Sol-gel method), but it is difficult to obtain uniformly distributed and nano-scale sheet-like Bi. 2 Sr 2 co 2 o y compound

Method used

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  • Preparation of Bi2Sr2Co2Oy thermoelectric compounds
  • Preparation of Bi2Sr2Co2Oy thermoelectric compounds
  • Preparation of Bi2Sr2Co2Oy thermoelectric compounds

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 As shown, Bi 2 Sr 2 co 2 o y A method for preparing a thermoelectric compound, comprising the steps of:

[0024] 1). Mix analytically pure glacial acetic acid and deionized water at a volume ratio of 1:1 as a solvent; then add analytically pure Co(NO 3 ) 2 ·6H 2 O, Sr(NO 3 ) 2 and Bi(NO 3 ) 3 ·5H 2 O, and stirred to mix, forming Co 2+ 、Sr 2+ 、 Bi 3+ A homogeneous transparent solution A with three metal ion concentrations of 0.03mol / L;

[0025] 2). Accounting for polyethylene glycol and solution A's mass percent by polyethylene glycol is 5% (solution A accounts for polyethylene glycol and solution A's mass percent is 95%), selects polyethylene glycol, and polyethylene glycol Pour into solution A and stir to obtain a uniform and transparent purple-red mixed solution B;

[0026] 3). Fully react the mixed solution B in a water bath at 80°C for 7 hours to obtain a uniform and transparent sol; heat the sol at 90°C in the air to make it gradual...

Embodiment 2

[0032] Bi 2 Sr 2 co 2 o y A method for preparing a thermoelectric compound, comprising the steps of:

[0033] 1). Mix analytically pure glacial acetic acid and deionized water at a volume ratio of 1:1 as a solvent; then add analytically pure Co(NO 3 ) 2 ·6H 2 O, Sr(NO 3 ) 2 and Bi(NO 3 ) 3 ·5H 2 O, and stirred to mix, forming Co 2+ 、Sr 2+ 、 Bi 3+ Homogeneous transparent solution A with three metal ion concentrations of 0.06mol / L;

[0034] 2). Accounting for polyethylene glycol and solution A's mass percent by polyethylene glycol is 5% (solution A accounts for polyethylene glycol and solution A's mass percent is 95%), selects polyethylene glycol, and polyethylene glycol Pour into solution A and stir to obtain a uniform and transparent purple-red mixed solution B;

[0035] 3). Fully react the mixed solution B in a water bath at 80°C for 7 hours to obtain a uniform and transparent sol; heat the sol at 90°C in the air to make it gradually become a dry gel;

[0036]...

Embodiment 3

[0041] Bi 2 Sr 2 co 2 o y A method for preparing a thermoelectric compound, comprising the steps of:

[0042] 1). Mix analytically pure glacial acetic acid and deionized water at a volume ratio of 1:1 as a solvent; then add analytically pure Co(NO 3 ) 2 ·6H 2 O, Sr(NO 3 ) 2 and Bi(NO 3 ) 3 ·5H 2 O, and stirred to mix, forming Co 2+ 、Sr 2+ 、 Bi 3+ A homogeneous transparent solution A with three metal ion concentrations of 0.03mol / L;

[0043] 2). Accounting for Polyethylene Glycol and Solution A's mass percentage by Polyethylene Glycol is 4% (Solution A accounts for Polyethylene Glycol and Solution A's mass percentage is 96%), choose Polyethylene Glycol, Polyethylene Glycol Pour into solution A and stir to obtain a uniform and transparent purple-red mixed solution B;

[0044] 3). Fully react the mixed solution B in a 60°C water bath for 10 hours to obtain a uniform and transparent sol; heat the sol at 60°C in the air to make it gradually become a dry gel;

[0045...

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Abstract

The invention relates to a preparation method of Bi2Sr2Co2Oy thermoelectric compounds which is characterized by: preparing a gel by sol-gel method using polyethylene glycol as a dispersant; pre-burning the gel at 300-500 DEG C after the gel is dried, heating the obtained precursor to 800-900 DEG C at air atmosphere, taking out the precursor after insulation for 1-5 hours, obtaining the uniform nano flake Bi2Sr2Co2Oy thermoelectric compounds. The method has advantages of simple and easily controllable method, short reaction period, easily available of the materials, simple device, which is safeand no pollution. The obtained Bi2Sr2Co2Oy thermoelectric compounds are flake, as well as uniform distribution and high purity with a wafer diameter of 1-3mum and a wafer thickness of 200-400nm.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to a Bi 2 Sr 2 co 2 o y Process for the preparation of thermoelectric compounds. Background technique [0002] Thermoelectric conversion technology is a technology that uses the Seebeck effect of semiconductor thermoelectric materials to directly convert thermal energy into electrical energy. Because it does not contain the huge transmission mechanism required by other power generation technologies, it has the characteristics of small size, long life, high reliability, simple manufacturing process, low manufacturing and operating costs, and wide application, so it has been valued by scientists. The field has broad prospects for development. [0003] Bi 2 Sr 2 co 2 o y It is a kind of oxide thermoelectric material suitable for medium and low temperature areas. It has unique characteristics of high temperature resistance, oxidation resistance, high strength, and no polluti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00C01G29/00C01F11/00
Inventor 唐新峰高文斌张莉张清杰
Owner WUHAN UNIV OF TECH
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