Modified Ca-Co-O system doped transition metal composite oxides and preparation method thereof

A composite oxide, transition metal technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, cobalt oxide/cobalt hydroxide, etc., can solve the problems of easy generation of impurities, high reaction temperature, long reaction time, etc. To achieve the effect of uniform particles, low reaction temperature and short synthesis time

Inactive Publication Date: 2010-12-08
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of high reaction temperature, long reaction time and easy generation of impurities in the existing preparation method of Ca-Co-O system, and to provide a doped modified Ca-Co-O system transition metal composite oxidation substances and their preparation methods

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  • Modified Ca-Co-O system doped transition metal composite oxides and preparation method thereof
  • Modified Ca-Co-O system doped transition metal composite oxides and preparation method thereof
  • Modified Ca-Co-O system doped transition metal composite oxides and preparation method thereof

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specific Embodiment approach 1

[0011] Specific implementation mode 1: In this implementation mode, the general formula of the doped modified Ca-Co-O system transition metal composite oxide is Ca 3 co 2-x m x o 6 or Ca 3-x-y m x N y co 4 o 9+δ Wherein M is Fe, Ni, Nd or Er, and N is Na or Bi, and its preparation method is to realize by following reaction: one, Ca(NO 3 ) 2 4H 2 Nitrate of O, M and Co(NO 3 ) 2 ·6H 2 O, or Ca(NO 3 ) 2 4H 2 O, M nitrate, N nitrate and Co(NO 3 ) 2 ·6H 2 O was dissolved in deionized water respectively, and then mixed evenly according to the stoichiometric ratio of the molecular formula, and then slowly poured into the citric acid solution according to the molar ratio of citric acid to all metal ions at 1.5-2:1, and then ultrasonically oscillated for 20-40 minutes to form Sol; 2. The sol obtained in step 1 is processed by microwave heating. The microwave heating temperature is 100° C. and the heating time is 20-60 minutes to obtain a wet gel; 3. Dry the wet gel ob...

specific Embodiment approach 2

[0012] Specific embodiment two: the difference between this embodiment and specific embodiment one is that Ca(NO 3 ) 2 4H 2 Nitrate of O, M and Co(NO 3 ) 2 ·6H 2 O is mixed according to the stoichiometric ratio of the molecular formula. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Specific embodiment three: the difference between this embodiment and specific embodiment one is that Ca(NO 3 ) 2 4H 2 O, M nitrate, N nitrate and Co(NO 3 ) 2 ·6H 2 O is mixed according to the stoichiometric ratio of the molecular formula. Others are the same as in the first embodiment.

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Abstract

The invention discloses modified Ca-Co-O system doped composite oxide of transition metals and the preparing method thereof, and relates to thermoelectric material and the preparing method thereof. The invention solves the problems of high reaction temperature, long reaction time and easy impurity production of the prior Ca-Co-O system preparing method. The general formula of the composite oxide is Ca3Co2-xMxO6 or Ca3-x-yMxNyCo4O9+Delta, wherein, M refers to Fe, Ni, Nd or Er, and N refers to Na or Bi. The method contains the following procedures: firstly, dissolving materials into deionized water according to the respective stoichiometric ratio of the molecular formula, mixing the water solution of raw materials uniformly, slowly injecting citric acid solution and performing ultrasonic oscillation to produce homogeneous sol; secondly, heating for dehydration with microwave to get wet sol; thirdly, drying the wet sol to get dry sol and allowing self-propagating combustion; fourthly, baking after grinding. Compared with the prior art, the invention has the advantages of short reaction time, low baking temperature and simple operation. The powder of the material of the invention has uniform particle distribution and high purity; the powder has flaky structure and the particle diameter is smaller than 200nm.

Description

technical field [0001] The invention relates to a thermoelectric material and a preparation method thereof, belonging to the field of oxide thermoelectric materials in functional materials; in particular to a doped modified Ca-Co-O system (Ca 3 co 2-x m x o 6 ) Transition metal composite oxide and preparation method thereof. Background technique [0002] Thermoelectric materials are functional materials that use the Seebeck effect to generate electricity and use the Peltier effect to cool. Thermoelectric materials can convert heat into electrical energy or use electrical energy to cool in some environments with special requirements, and because thermoelectric materials cause little harm to the environment and humans during use (since thermoelectric materials use electrons in solid Migration achieves the purpose of exchanging energy. Therefore, thermoelectric devices have the characteristics of no moving parts, no maintenance, no pollution, and easy miniaturization) and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04C01F11/02C04B35/057C04B35/32C04B35/626
Inventor 陈刚周楠裴建刘璞生陆冬青
Owner HARBIN INST OF TECH
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