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Preparing method of nano laminar thermoelectric Bi2Se3 compound

A nanosheet and compound technology, which is applied in the fields of nanostructure manufacturing, binary selenium/tellurium compounds, nanotechnology, etc., can solve the problems of complex process, long reaction period, large energy consumption, etc., and achieves simple process and high reaction time. Short, repeatable results

Inactive Publication Date: 2010-06-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, for Bi 2 Se 3 The preparation methods of polycrystalline compounds include: solid state reaction (Solid state reaction, SSR), melting method (Melt reaction, MR), solvothermal method (Solvothermal method, SM), electrochemical deposition method (Electrochemical deposition method, EDM), etc. , but the above method requires high temperature and high pressure, or the reaction cycle is longer, the process is more complicated, the energy consumption is larger, and the Bi obtained by different preparation methods 2 Se 3 Polycrystalline materials vary in morphology

Method used

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  • Preparing method of nano laminar thermoelectric Bi2Se3 compound
  • Preparing method of nano laminar thermoelectric Bi2Se3 compound
  • Preparing method of nano laminar thermoelectric Bi2Se3 compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] like figure 1 As shown, the nanosheet Bi 2 Se 3 The preparation method (one-step wet chemical reaction preparation) of thermoelectric compound, it comprises the steps:

[0022] 1) NH with pH=10 3 ·H 2 O-NH 4 Cl buffer solution was used as solvent, Bi(NO 3 ) 3 ·5H 2 O as bismuth source, with C 10 h 14 N 2 Na 2 o 8 2H 2 O is a complexing agent, according to NH 3 ·H 2 O-NH 4 Cl buffer solution: Bi(NO 3 ) 3 ·5H 2 O:C 10 h 14 N 2 Na 2 o 8 2H 2 O=1L: 0.02mol: 0.02mol is batched, mixed, and magnetically stirred for 30min to obtain mixed solution A (Bi is formed in mixed solution A 3+ , metal ion concentration 0.02mol / L, C 10 h 14 N 2 Na 2 o 8 2H 2 O molar concentration is 0.02mol / L);

[0023] 2) With the synthetic sodium selenosulfate as the selenium source, in the mixed solution A according to the chemical formula Bi 2 Se 3 The stoichiometric ratio of sodium selenosulfate was added (i.e. according to Bi(NO 3 ) 3 ·5H 2 Bi in O 3+ : Se in s...

Embodiment 2

[0028] like figure 1 As shown, the nanosheet Bi2 Se 3 The preparation method (one-step wet chemical reaction preparation) of thermoelectric compound, it comprises the steps:

[0029] 1) NH with pH=10 3 ·H 2 O-NH 4 Cl buffer solution was used as solvent, Bi(NO 3 ) 3 ·5H 2 O as bismuth source, with C 10 h 14 N 2 Na 2 o 8 2H 2 O is a complexing agent, according to NH 3 ·H 2 O-NH 4 Cl buffer solution: Bi(NO 3 ) 3 ·5H 2 O:C 10 h 14 N 2 Na 2 o 8 2H 2 O=1L: 0.02mol: 0.02mol is batched, mixed, and magnetically stirred for 30min to obtain mixed solution A (Bi is formed in mixed solution A 3+ , metal ion concentration 0.02mol / L, C 10 h 14 N 2 Na 2 o 8 2H 2 O molar concentration is 0.02mol / L);

[0030] 2) With the synthetic sodium selenosulfate as the selenium source, in the mixed solution A according to the chemical formula Bi 2 Se 3 The stoichiometric ratio of sodium selenosulfate was added (i.e. according to Bi(NO 3 ) 3 · 5 h 2 Bi in O 3+ : Se in ...

Embodiment 3

[0035] like figure 1 As shown, the nanosheet Bi 2 Se 3 The preparation method (one-step wet chemical reaction preparation) of thermoelectric compound, it comprises the steps:

[0036] 1) NH with pH=10 3 ·H 2 O-NH 4 Cl buffer solution was used as solvent, Bi(NO 3 ) 3 ·5H 2 O as bismuth source, with C 10 h 14 N 2 Na 2 o 8 2H 2 O is a complexing agent, according to NH 3 ·H 2 O-NH 4 Cl buffer solution: Bi(NO 3 ) 3 ·5H 2 O:C 10 h 14 N 2 Na 2 o 8 2H 2 O=1L: 0.02mol: 0.02mol is batched, mixed, and magnetically stirred for 30min to obtain mixed solution A (Bi is formed in mixed solution A 3+ , metal ion concentration 0.02mol / L, C 10 h 14 N 2 Na 2 o 8 2H 2 O molar concentration is 0.02mol / L);

[0037] 2) With the synthetic sodium selenosulfate as the selenium source, in the mixed solution A according to the chemical formula Bi 2 Se 3 The stoichiometric ratio of sodium selenosulfate was added (i.e. according to Bi(NO 3 ) 3 · 5 h 2 Bi in O 3+ : Se i...

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Abstract

The present invention relates to a preparing method of a nano laminar thermoelectric Bi2Se3 compound. The preparing method of a nano laminar thermoelectric Bi2Se3 compound is characterized in that the method comprises the following steps: 1) NH3 H2O-NH4C1 buffer solution, Bi(NO3)3 5H2O and C10H14N2Na2O8 2H2O are prepared at the ratio of 1L to 0.02mol to 0.02mol, mixed and agitated by magnetic force for 30 minutes, and a mixed solution A is obtained; 2) selenosulfate is added to the mixed solution A by the stoichiometric ratio of the chemical formula Bi2Se3, and a mixed solution B is obtained by uniformly agitating the mixture; 3) a product C is obtained by agitating the mixed solution B under argon protective atmosphere; 4) the product C obtained in the step 3 is centrifuged, and the nano laminar thermoelectric Bi2Se3 compound is obtained by freeze-drying the sediments obtained by centrifugation. The method has the advantages of easy raw material acquisition, no reductant requirement, cost saving, short reaction time, low energy consumption, good repeatability, simple equipment, simple technique, high safety and no pollution. The present invention is suitable for large scale industrial production.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to a Bi 2 Se 3 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 Se 3 The compound is an n-type thermoelectric material that was studied earlier, and it has high electrical conductivity at room temperature, which makes the material have a high ZT value and has a good application prospect near room...

Claims

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Application Information

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IPC IPC(8): C01B19/04B82B3/00
Inventor 唐新峰王娟张文浩苏贤礼
Owner WUHAN UNIV OF TECH
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