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Spinel powder with high temperature conductivity and synthesis method and application thereof

A spinel and conductivity technology, applied in the field of solid oxide fuel cells, can solve the problems of poor commercialization prospects and poor conductivity, achieve excellent high-temperature oxidation resistance, prevent cathode poisoning, and inhibit growth

Inactive Publication Date: 2017-04-26
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cr-containing spinel film MgCr 2 o 4 , Mn 1.2 Cr 1.8 o 4 、NiCr 2 o 4 、CuCr 2 o 4 、ZnCr 2 o 4 、CoCr 2 o 4 Poor electrical conductivity (except CoCr 2 o 4 Outside the film layer, the other conductivity is 0.01-0.4Scm -1 About), the coefficient of thermal expansion is 7×10 -6 K -1 (The CTE of the stainless steel plate is at 11×10 -6 K -1 left and right), and there are serious problems such as Cr volatilization, and the commercialization prospect is not good. Therefore, the Cr-free film material is the research focus

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of Mn by Sol-Gel Method 0.95 Cu 0.05 co 2 o 4 Spinel powder, the raw material used is analytically pure Mn(NO 3 ) 2 , Co(NO 3 ) 2 , Cu(NO 3 ) 2 and citric acid. First dissolve citric acid and polyvinylpyrrolidone in distilled water, then dissolve Cu salt and Co salt, and finally add manganese nitrate solution. The proportioning of described solution (metal element by molar ratio, polyvinylpyrrolidone by mass ratio) is Cu:Mn molar ratio=0.05:0.95, and Co:(Mn+Cu) molar ratio=2:1, citric acid The concentration is twice the molar concentration of all metal ions, and the polyvinylpyrrolidone is 10% of the total mass of the metal salt and citric acid. The solution was magnetically stirred for 2 hours at room temperature, then placed in an oven for 4 hours at 40°C, 2 hours at 80°C, and 2 hours at 100°C. The water in the solution volatilized to form a sol, and the temperature was raised to 220°C for 8 hours to form a solid powder. The solid powder is calc...

Embodiment 2

[0022] Preparation of Mn by Sol-Gel Method 0.9 Cu 0.1 CoO 4 Spinel powder, the raw material used is analytically pure Mn(NO 3 ) 2 , Co(NO 3 ) 2 , Cu(NO 3 ) 2 and citric acid. First dissolve citric acid and polyvinylpyrrolidone in distilled water, then dissolve Cu salt and Co salt, and finally add manganese nitrate solution. The proportioning ratio of described solution (metal element by molar ratio, polyvinylpyrrolidone by mass ratio) is Cu:Mn molar ratio=0.1:0.9, and Co:(Mn+Cu) molar ratio=1:1, citric acid The concentration is 1 time of the molar concentration of all metal ions, and the polyvinylpyrrolidone is 15% of the total mass of the metal salt and citric acid. The solution was magnetically stirred for 2 hours at room temperature, then placed in an oven at 40° C. for 6 hours, and at 80° C. for 3 hours. Incubate at 100°C for 2 hours, and the water in the solution evaporates to form a sol. Raise the temperature to 220°C and keep it warm for 15 hours to volatiliz...

Embodiment 3

[0025] Preparation of Mn by Sol-Gel Method 0.75 Cu 0.25 co 1.5 o 4 Spinel powder, the raw material used is analytically pure Mn(NO 3 ) 2 , Co(NO 3 ) 2 , Cu(NO 3 ) 2 and citric acid. First dissolve citric acid and polyvinylpyrrolidone in distilled water, then dissolve Cu salt and Co salt, and finally add manganese nitrate solution. The proportioning of described solution (metal element by molar ratio, polyvinylpyrrolidone by mass ratio) is Cu:Mn molar ratio=0.25:0.75, and Co:(Mn+Cu) molar ratio=1.5:1, citric acid The concentration is 1.5 times of the molar concentration of all metal ions, and the polyvinylpyrrolidone is 20% of the total mass of the metal salt and citric acid. The solution was stirred with magnetic force for 3 hours at room temperature, and then put into an oven for 4 hours at 40° C. and 80° C. for 4 hours. Incubate at 100°C for 3 hours, and the water in the solution evaporates to form a sol. Raise the temperature to 220°C and keep it warm for 9 hour...

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Abstract

The invention discloses spinel powder with high temperature conductivity and a synthesis method and application thereof, complexing agent citric acid and binder polyvinylpyrrolidone are dissolved in turn in distilled water, then a Cu salt and a Co salt are dissolved into the distilled water, and finally a manganese nitrate solution is added; the obtained mixed solution is stirred magnetically for 2-3h at room temperature, then thermally insulated for 4-6h at 40 DEG C, then thermally insulated for 2-4h at 80 DEG C, and thermally insulated for 2-4h at 100 DEG C to form a colloid; the colloid is heated to 220 DEG C and thermally insulated for 8-15h for volatilization of organic compounds for formation of solid powder. The spinel powder improves the high temperature oxidation resistance and conductive properties of a metal connector in a solid oxide fuel cell in an oxidizing atmosphere, and inhibits cathode poisoning caused by Cr diffusion in a metal matrix, and the spinel powder can be used for the preparation of a metal connector surface used as a corrosion resistant conductive layer.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cells, in particular to a Mn with high temperature conductivity 1- x Cu x co y o 4 The spinel powder, its synthesis method and its coating preparation process are applied to the surface protection of solid oxide fuel cell metal connectors. Background technique [0002] Solid Oxide Fuel Cell (Solid Oxide Fuel Cell) is a solid-state electronic device that converts the chemical energy generated by the reaction of fuel and oxidant into electrical energy at high temperature. Compared with low-temperature fuel cells, solid oxide fuel cells have the following advantages: high thermal energy conversion efficiency, fast electron movement, good resistance to catalytic toxicity, and the ability to directly use hydrocarbon fuels. The metal link separates the fuel and oxidant while conducting electricity with the adjacent cell structure. In recent years, many research focuses have turned to improve the li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/626C04B35/622H01M8/0297
CPCC04B35/01C04B35/62222C04B35/626C04B2235/3262C04B2235/3281C04B2235/443C04B2235/96C04B2235/9607H01M8/0297Y02E60/50
Inventor 郭平义张宇邵勇赖永彪乔岩欣刘宁
Owner JIANGSU UNIV OF SCI & TECH
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