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Method for preparing solid oxide fuel cell composite cathode through low-temperature sintering

A solid oxide, composite cathode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of particle growth, uneven mixing, specific surface and three-phase interface loss, etc., to achieve large specific surface area and good contact. , the effect of oxygen reduction active site increase

Inactive Publication Date: 2014-06-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional composite cathode is obtained by mechanical mixing, which has the problem of uneven mixing, and the material has to be sintered at high temperature twice (≥1100°C) for the powder and the electrode, which makes the particle growth serious, and the specific surface and three Severe loss of phase interface

Method used

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  • Method for preparing solid oxide fuel cell composite cathode through low-temperature sintering
  • Method for preparing solid oxide fuel cell composite cathode through low-temperature sintering
  • Method for preparing solid oxide fuel cell composite cathode through low-temperature sintering

Examples

Experimental program
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Embodiment 1

[0026] Synthesized by triammonium citrate method (La 0.8 Sr 0.2 ) 0.9 MnO 3±d –YSZ=60:40wt%, composite cathode material, where (La 0.8 Sr 0.2 ) 0.9 MnO 3+d is 0.02mol, weigh 6.2361g La(NO 3 ) 3 ·6H 2 O (analytically pure), 0.7657g Sr(NO 3 ) 2 (analytically pure), 7.158g Mn(NO 3 ) 2 (analytical pure 50wt% solution), 8.7686gZr(NO 3 ) 4 ·5H 2 O (analytically pure), 1.3560g Y (NO 3 ) 3 ·6H 2 O (analytical pure), completely dissolved in 100ml deionized water, then add 19.0406g triammonium citrate (analytical pure) according to the ratio of triammonium citrate: total molar number of metal ions=1:1.2 (molar ratio), and use nitric acid Adjust the pH value of the mixed solution to 1 to completely dissolve it, then heat it to cause a reaction in the solution system and evaporate water, the solution gradually becomes viscous and becomes a transparent sol, then move it to a heating furnace for heating to cause self-propagating combustion. Collect the primary powder obta...

Embodiment 2

[0028] Synthesized together by the glycine method (La 0.8 Sr 0.2 ) 0.9 MnO 3±d –YSZ=60:40wt% composite material, where (La 0.8 Sr 0.2 ) 0.9 MnO 3+d is 0.01mol, weigh 3.1181g La(NO3 ) 3 ·6H 2 O (analytically pure), 0.3828gSr(NO 3 ) 2 (analytically pure), 3.579g Mn(NO 3 ) 2 (analytical pure 50wt% solution), 4.3804gZr(NO 3 ) 4 ·5H 2 O (analytically pure), 0.6797g Y (NO 3 ) 3 ·6H 2 O (analytical pure), completely dissolved in 100ml deionized water, add 3.8267g glycine (analytical pure) according to the ratio of glycine:total moles of metal ions=1:2.31 (molar ratio), heat complexation and evaporate water after complete dissolution After the solution becomes viscous gradually, it is moved to a heating furnace for heating, and it is burned, and the primary powder obtained is collected, and part of the primary powder is taken and roasted using the same heating program as the electrode (sintering program in the same embodiment 3). SEM photos as figure 2 with image...

Embodiment 3

[0030] As prepared in Example 1 (La 0.8 Sr 0.2 ) 0.9 MnO 3±d – YSZ (mass ratio) = 55:45%, 60:40%, 65:35%, 70:30% primary powder, grind evenly, add 711 glue to make cathode slurry, coat 0.0100g on the anode electrolyte Combined, the temperature is programmed to sinter.

[0031] The sintering program is: from room temperature to 400°C, heat up at 1°C / min; when it is greater than 400°C~800°C, heat up at 5°C / min; when it is greater than 800~950°C, heat up at 2°C / min, Hold at 950°C for 180 minutes; drop to 400°C at 2°C / min; then cool with the furnace.

[0032] Battery evaluations were performed on self-assembled devices. The I-V curve was measured after polarization at 800°C for 16h. The result is as Figure 4 shown.

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Abstract

The invention provides a method for preparing a solid oxide fuel cell composite cathode through low-temperature sintering. The method comprises: employing a composite cathode material primary powder synthesized by employing an ammonium citrate process to prepare a slurry, coating an anode electrolyte two-in-one assembly, and sintering at a low temperature of 900-1000 DEG C for preparing the cell cathode. The composite cathode possesses perovskite phase and cubic fluorite phase at the same time, and is a mixed ionic electronic conductor. Particle size is uniform, specific surface area is large, many three-phase interfaces as electrochemical active sites exists and are uniformly distributed in the whole cathode body, cell performances are higher than those of a conventional mechanically mixed cathode, and a cell can stably run.

Description

technical field [0001] The invention relates to a solid oxide fuel cell composite cathode, in particular to a method for preparing a solid oxide fuel cell composite cathode by low-temperature sintering. Background technique [0002] A solid oxide fuel cell is an energy conversion device that converts chemical energy in fuel directly into electrical energy. A typical solid oxide fuel cell consists of three parts: anode, electrolyte and cathode. For the anode-supported thin-film batteries mainly used today, the cathode polarization loss is the main factor restricting the battery performance. At the cathode, it is mainly the electrochemical reduction process of oxygen, including the diffusion of oxygen in the gas phase to the surface of the cathode through the interstitial pores, where adsorption and dissociation occur, and the electrons transported by the electron-conducting phase are accepted and converted into oxygen ions into the electrolyte crystal. Grid several processe...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCH01M4/881H01M4/8828H01M4/8885H01M4/8889Y02E60/50
Inventor 程谟杰张小敏涂宝峰崔大安区定容
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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