Acetate doping natrium cobaltite thermoelectric materials and preparation method thereof

A thermoelectric material, acetate technology, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of long time, easy gel breakage, difficult to accurately grasp the drying process, etc., to achieve high chemical uniformity, Significant effect of layered structure

Inactive Publication Date: 2008-09-03
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method reacts evenly and fully, but there are still some problems, such as a large amount of NO2 yellow toxic gas will be released during the heating process of the solution; Easy to break; and low temperature drying takes too long, it is difficult to accurately grasp the drying process

Method used

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  • Acetate doping natrium cobaltite thermoelectric materials and preparation method thereof
  • Acetate doping natrium cobaltite thermoelectric materials and preparation method thereof
  • Acetate doping natrium cobaltite thermoelectric materials and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Example 1. Na 1.5 (Co 0.9 Ni 0.1 ) 2 o 4

[0059] CH 3 COONa·3H 2 O (75mmol), (CH 3 COO) 2 Co 4H 2 O (90mmol), (CH 3 COO) 2 Ni·4H 2 O (10mmol), C 6 h 8 o 7 ·H 2 O (525mmol) was added to the beaker, and then the mixture was dissolved with 1600ml deionized water. Heat and stir at 323K to form a homogeneous solution. Pour it into a rotary evaporator, and evaporate under reduced pressure for 1 hour at a temperature of 353K and a pressure of less than 0.1MP, and the solution gradually becomes viscous. The viscous sol was placed in an oven, and dried under reduced pressure for 120 minutes at a constant temperature of 373K and a pressure of less than 0.1MP to form a fluffy xerogel. The xerogel was further pyrolyzed at 693K for 6 hours to fully drive off the residual organic matter and form a black precursor. After calcination at 1033K for 6 hours, the sintering precursor powder is formed. Grind the sintered precursor powder to a uniform powder, press moldin...

Embodiment 2

[0060] Example 2. Na 1.5 (Co 0.9 Cu 0.1 ) 2 o 4

[0061] CH 3 COONa·3H 2 O (75mmol), (CH 3 COO) 2 Co 4H 2 O (90mmol), (CH 3 COO) 2 Cu·H 2 O (10mmol), C 6 h 8 o 7 ·H 2 O (525mmol) was added to the beaker, and then the mixture was dissolved with 1600ml deionized water. Heat and stir at a temperature of 313K-333K to form a uniform solution. Pour it into a rotary evaporator, and evaporate under reduced pressure for 1 hour at a temperature of 353K-363K and a pressure of less than 0.1MP, and the solution gradually becomes viscous. The viscous sol is placed in an oven, and dried under reduced pressure for 110 minutes at a temperature of 323K-393K and a pressure of less than 0.1MP to form a fluffy xerogel. The xerogel was further pyrolyzed at 693K-773K for 7 hours to fully drive off residual organic matter and form a black precursor. After calcination at 993K-1053K for 6 hours, the sintering precursor powder is formed. Grind the sintered precursor powder to a unifo...

Embodiment 3

[0062] Example 3. Na 1.5 (Co 0.85 Cu 0.15 ) 2 o 4

[0063] CH 3 COONa·3H 2 O (75mmol), (CH 3 COO) 2 Co 4H 2 O (85mmol), (CH 3 COO) 2 Cu·H 2 O (15mmol), C 6 h 8 o 7 ·H 2 O (525mmol) was added to the beaker, and then the mixture was dissolved with 1600ml deionized water. Heat and stir at a temperature of 313K to form a homogeneous solution. Pour it into a rotary evaporator, and evaporate under reduced pressure for 1 hour at a temperature of 353K and a pressure of less than 0.1MP, and the solution gradually becomes viscous. The viscous sol was placed in an oven at a constant temperature of 323K and the pressure was less than 0.1MP, and dried under reduced pressure for 100 minutes to form a fluffy xerogel. The xerogel was further pyrolyzed at 773K for 6 hours to fully drive off the residual organic matter and form a black precursor. After calcination at 1053K for 6 hours, the sintering precursor powder is formed. Grind the sintered precursor powder to a uniform...

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Abstract

The invention belongs to the technology field of oxide thermoelectric materials of the functional materials and the preparation thereof, and relates in particular to thermoelectric materials of acetate doping with co-o-Na. The invention utilizes sol-gal method, takes the acetate as the raw material and the citric acid as the complexing agent. The sol is formed at the temperature of 353 K to 363K and the xerogel is formed at the temperature of 323 K to 393K. The precursor nano meter powder can be obtained by gel pyrolysis and roasting; and the bulk material can be got by sintering finally. The invention utilizes the common water metal acetate as the raw material and the whole preparation process does not produce poisonous and harmful gas. The synthesis technology is simple and safe; furthermore, the drying process adopts decompression drying and realizes the drying process with low temperature and short time; also, the precursor powder has good uniformity and obvious layered structure, which is helpful to producing the bulk thermoelectric materials with high crystal orientation and high performance.

Description

technical field [0001] The invention belongs to the technical field of oxide thermoelectric materials in functional materials and its preparation, and in particular relates to an acetate-doped sodium cobaltate thermoelectric material and a preparation method thereof. Background technique [0002] Thermoelectric materials are functional materials that can convert heat and electricity into each other. The thermoelectric device made of this material has no mechanical transmission part, compact structure, has the advantages of no noise, no pollution, long life, green environmental protection, etc., and can be widely used in military generators, automobile exhaust generators, industrial waste gas thermal power generation, etc. It is an environmentally friendly energy material with great application potential. The performance of thermoelectric materials is usually expressed by the dimensionless constant ZT: ZT=TS 2 / ρκ. Among them, S is the Seebeck coefficient, also known as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C04B35/32
Inventor 王蕾王鸣杜兆富赵栋梁
Owner CENT IRON & STEEL RES INST
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