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Ni-doped CuCrO2-based oxide thermoelectric material and preparation method thereof

A technology of thermoelectric materials and oxides, applied in thermoelectric device node lead-out materials, thermoelectric device manufacturing/processing, chromate/dichromate, etc., can solve complex repeatability, cobalt volatile process, etc. problem, to achieve the effect that the preparation process is simple and easy to master

Inactive Publication Date: 2016-10-12
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another class of thermoelectric properties that perform well are alkali metal or alkaline earth metal cobalt oxides or calcium cobalt oxides, such as NaCoO 2 and Ca 3 co 4 o 9 However, in the preparation of such materials, cobalt is easy to volatilize, which makes the process complicated and poor in repeatability

Method used

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  • Ni-doped CuCrO2-based oxide thermoelectric material and preparation method thereof
  • Ni-doped CuCrO2-based oxide thermoelectric material and preparation method thereof
  • Ni-doped CuCrO2-based oxide thermoelectric material and preparation method thereof

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Embodiment 1

[0030] Ni-doped CuCrO provided by the invention 2 Based oxide thermoelectric material, the compound formula is CuCr 1-x Ni x o 2 , x is 0.001-0.08; the above thermoelectric material is a p-type semiconductor with rod-shaped grains, the length of rod-shaped grains is 20-30 μm, and the aspect ratio is (8-12):1; the structure is layered rhomboid in R-3m space group phase crystal structure.

[0031] The above-mentioned thermoelectric material is prepared from copper oxide, dichromium trioxide and nickel oxide as starting materials through mixing, pre-sintering, tableting and sintering, wherein the amount of copper oxide, dichromium trioxide and nickel oxide is based on Cu, Cr , Ni, the molar ratio is 1: (1-x): x, x is 0.001-0.08.

[0032] Among them, pre-firing can be carried out in stages, using 850-1000 ° C for 12-24 hours, and then pre-firing again after pressing, the above pre-firing steps can be repeated 2-3 times, the final sintering temperature is 1100-1200 ° C, and the...

Embodiment 2

[0041] (1) First, mix copper oxide with a purity of 99.99%, chromium oxide with a purity of 99.99%, and nickel oxide with a purity of 99% (S.P.) according to the ratio of Cu, Cr, and Ni corresponding to 1:0.995:0.005 , the above mixture is ball-milled with absolute ethanol or deionized water as a medium to obtain a paste-like substance;

[0042] (2) The pasty substance obtained in (1) is kept in an oven at 110ºC for 20 hours to obtain a dry powder, and then pre-fired in a muffle furnace at 900ºC for 20 hours in an air environment;

[0043] (3) Grind the reactant prepared in (2) into a fine uniform powder, press it into a disc with a diameter of about 15mm under a pressure of 20~30MPa, then sinter at 1000ºC for 20h, and grind the reactant again into a fine uniform powder, Obtain pre-sintered powder;

[0044] (4) Press the pre-sintered powder prepared in (3) into a disc with a diameter of about 15mm and a thickness of about 4mm under a pressure of about 25~40MPa, and then sinte...

Embodiment 3

[0047] (1) First, mix copper oxide with a purity of 99.99%, chromium oxide with a purity of 99.99%, and nickel oxide with a purity of 99% (S.P.) according to the ratio of Cu, Cr, and Ni corresponding to the amount of the substance at 1:0.99:0.01 , the above mixture is ball-milled with absolute ethanol or deionized water as a medium to obtain a paste-like substance;

[0048] (2) The pasty substance obtained in (1) is kept in an oven at 100ºC for 24 hours to obtain a dry powder, and then pre-fired in a muffle furnace at 860ºC for 20 hours in an air environment;

[0049] (3) Grind the reactant prepared in (2) into a fine uniform powder, press it into a disc with a diameter of about 15mm under a pressure of 20~30MPa, then sinter at 1010ºC for 25h, and grind the reactant again into a fine uniform powder, Obtain pre-sintered powder;

[0050] (4) Press the pre-sintered powder prepared in (3) into a disc with a diameter of about 15mm and a thickness of about 4mm under a pressure of a...

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Abstract

The invention provides a Ni-doped CuCrO2-based oxide thermoelectric material. A chemical combination formula of the Ni-doped CuCrO2-based oxide thermoelectric material is CuCr1-xNixO2, and x is 0.001-0.08. A preparation method comprises the following steps: taking copper oxide, chromium sesquioxide and nickel oxide as starting materials; mixing, pre-sintering, carrying out tablet compressing and sintering to obtain the Ni-doped CuCrO2-based oxide thermoelectric material. The prepared nickel-doped CuCrO2 metal oxide thermoelectric material is excellent in thermoelectric property, the power factor of the thermoelectric material can reach up to 100 (mu)W / (mK<2>) to a maximum extent when the working temperature is 300 DEG C; meanwhile, by a solid-phase reaction mode, a preparation technology is simple in technological process, easy to control and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, in particular to a Ni-doped CuCrO 2 Oxide-based thermoelectric material and its preparation method. Background technique [0002] In today's society, energy has become the economic lifeline of a country. As the supply of fossil energy raw materials is decreasing day by day, at the same time the human demand for energy is increasing year by year. This has brought a series of challenges to human survival in the future, making people have to turn to the pursuit of new energy. In recent years, various countries in the world have vigorously developed new energy sources such as nuclear energy, hydropower, and wind energy. As an environment-friendly material, hot spot material has also attracted much attention and pursuit. Thermoelectric material is a functional material that can convert heat energy and electric energy. It is based on the Seebeck effect discovered in 1823...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/14C04B35/45H01L35/22H01L35/34H10N10/01H10N10/855
CPCC01G37/14C04B35/45C01P2006/80C01P2004/82C01P2004/03C01P2004/16C01P2002/72C04B2235/3279C04B2235/3281H10N10/855H10N10/01
Inventor 罗世钧徐斌杨晓辉宋晓燕徐凯杨大鹏李艺星
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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