Preparation method of active (Mn, Re, Co)3O4 spinel mixed electrode materials and application thereof in HEMAA

A mixed electrode and spinel technology, applied to battery electrodes, circuits, electrical components, etc., can solve the problems of easy peeling, high porosity, high cost, etc., and achieve good high temperature oxidation resistance and good electrical conductivity.

Inactive Publication Date: 2013-09-25
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, spinel coating is prepared by electrodeposition, the preparation process is limited by the surface shape of the workpiece, such as the groove-like structure of the connector, and this method is expensive and difficult to obtain a thicker coating
Plasma spraying is suitable for preparing coatings with complex composition and large thickness, but there are also disadvantages such as non-dense coating, high porosity, easy peeling off when subjected to thermal cycles, and high cost.
Sol-gel method and slurry method are economical and practical, but problems such as coating compactness, coating / metal interface bonding, coating thickness and cracking are difficult to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] One active (Mn,Re,Co) 3 o 4 The preparation method of spinel mixed electrode, the steps are as follows:

[0022] (1) Dissolve the manganese nitrate, cobalt nitrate, lanthanum nitrate and citric acid compounds with the molar ratio of metal ions La:Co=0.5:0.5, and (La+Co):Mn=1:1 with distilled water, lemon The acid concentration is twice the sum of the La, Co, and Mn ion concentrations. The prepared solution was stirred at room temperature for 3 h with a magnetic stirrer.

[0023] (2) The stirred solution was dried at 200°C for 1 hour at low temperature, and then calcined at 350°C for 48 hours to remove organic matter. Finally at 5%H 2 And 95% Ar atmosphere, calcined in a high-temperature atmosphere furnace at 600 ° C for 24 hours to obtain ultrafine active mixed powder with a particle size of 10-1000 nm.

[0024] (3) The resulting ultrafine MnO, Co and La 2 o 3 The active mixed powder is put into the mold, under argon atmosphere, 1400°C high temperature and 20MPa ...

Embodiment 2

[0026] One active (Mn,Re,Co) 3 o 4 The preparation method of spinel mixed electrode, the steps are as follows:

[0027] (1) Manganese nitrate, cobalt nitrate, lanthanum nitrate, and dysprosium nitrate with the molar ratio of metal ions as (La+Dy):Co=(0.05+0.05):0.9, and (La+Dy+Co):Mn=1:0.5 and citric acid compound are all dissolved in distilled water, and the concentration of citric acid is 3 times of the sum of La, Co, Dy, and Mn ion concentrations.

[0028] (2) Use a magnetic stirrer to stir the prepared solution at room temperature for 10 h. The stirred solution was dried at a low temperature of 100°C for 80 hours, and then calcined at a medium temperature of 400°C for 20 hours to remove organic matter. Finally at 3%H 2 And 97% Ar atmosphere, calcined in a high-temperature atmosphere furnace at 800 ° C for 5 hours to obtain ultrafine active mixed powder with a particle size of 10-1000 nm.

[0029] (3) The resulting ultrafine MnO, Co and La 2 o 3The active mixed powde...

Embodiment 3

[0031] One active (Mn,Re,Co) 3 o 4 The preparation method of spinel mixed electrode, the steps are as follows:

[0032] (1) Dissolve all the manganese nitrate, cobalt nitrate and EDTA2Na compounds with the molar ratio of metal ions at Co:Mn=1:2 in distilled water, and the concentration of EDTA2Na is 1 times of the sum of Co and Mn ion concentrations.

[0033] (2) Dry the prepared solution at 60°C for 200 hours at low temperature, and then calcinate at 500°C for 2 hours to remove organic matter. Finally at 2%H 2 and 98% Ar atmosphere, calcined in a high-temperature atmosphere furnace at 900°C for 1 hour to obtain an ultrafine active mixed powder with a particle size of 10-1000nm.

[0034] (3) The resulting ultrafine MnO, Co and La 2 o 3 The active mixed powder is put into the mold, under argon atmosphere, 900°C high temperature and 60MPa pressure, sintered and formed, and then processed into the required rod. The obtained rod has a high-temperature electrical conductivity...

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PUM

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Abstract

The invention discloses a preparation method of active (Mn, Re, Co)3O4 spinel mixed electrode materials, and the preparation method is characterized by comprising the following steps: (1) dissolving soluble salts of Mn, Co and rare earth elements, and a complexing agent in distilled water, and uniformly stirring the obtained mixture at room temperature; (2) carrying out low-temperature drying on a solution obtained in the step (1) for 1-200 hours at a temperature of 60-200 DEG C, and carrying out intermediate-temperate calcinating on the obtained object for 2-48 hours at a temperature of 350-500 DEG C so as to remove organic matters, and in a reducing atmosphere, calcining the obtained product for 1-24 hours in a high-temperature atmosphere furnace at a temperature of 600-900 DEG C so as to obtain superfine active mixed powder with the particle size of 10-1000 nm; (3) placing the superfine MnO, Co and Re2O3 active mixed powder obtained in the step (2) into a die, and in a vacuum or protective atmosphere, carrying out sinter molding on the obtained product at a high temperature of 900-1400 DEG C and at a pressure of 20-60 Mpa. The obtained electrode has good room-temperature toughness and electrical conductivity.

Description

technical field [0001] The invention relates to the field of solid oxide fuel cells and high-energy micro-arc electrodeposition technology, more specifically, relates to an active (Mn, Re, Co) with room temperature toughness and conductivity 3 o 4 Preparation method of spinel mixed electrode (Re represents rare earth elements La, Y, Dy). Background technique [0002] Among the various fuel cells as efficient and clean energy sources, Solid Oxide Fuel Cell (Solid Oxide Fuel Cell) is a new type of power generation device, which is a kind of operating temperature between 650-1000 ° C, which can be reduced by a variety of fuels. A power generation device that uses pure oxygen or oxygen in the air as an oxidant to directly convert chemical energy into electrical energy through electrode reactions. Its high operating temperature makes its thermoelectric comprehensive efficiency very high, and it can realize the internal combustion of hydrocarbons used as fuel. Reforming, which d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 邵勇郭平义张名涛王小京芦笙
Owner JIANGSU UNIV OF SCI & TECH
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