Preparation method of cathode of low-medium temperature solid oxide fuel cell

A fuel cell cathode, solid oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high cathode polarization impedance, poor repeatability, slow transmission, etc.

Inactive Publication Date: 2011-06-22
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the above-mentioned deficiencies existing in the prior art, and provides a method for preparing the cathode of a medium-low temperature solid oxide fuel cell, which solves the difficulty in controllable preparation of the cathode layer structure of the commonly used medium-temperature solid oxide fuel cell, poor repeatability, and oxygen transmission in the cathode. The concentration polarization of oxygen is too slow and the cathode polarization resistance is high. By selecting the powder synthesis process, calcination temperature and heating rate, a cathode layer with a specific lamellar structure is prepared. This structure increases Three-phase interface and reactive sites for cathodic reactions, leading to significant improvement in cathodic performance
The process is simple and easy to repeat because no template is used in the preparation process

Method used

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  • Preparation method of cathode of low-medium temperature solid oxide fuel cell
  • Preparation method of cathode of low-medium temperature solid oxide fuel cell
  • Preparation method of cathode of low-medium temperature solid oxide fuel cell

Examples

Experimental program
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Embodiment 1

[0028] (1) Synthesis of La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ Nanopowder: take La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 )2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O was dissolved in deionized water, and then EDTA and citric acid were added according to the ratio of the total number of metal ions: EDTA: citric acid (number of moles) = 1:1:1.2, and then NH 3 ·H 2 O to adjust the pH value of the solution to 6-10. Evaporate and concentrate at 80-90 to obtain a reddish-brown gel. The gel is heated in an air atmosphere at 200-400° C. for 5-8 hours to obtain a precursor. The precursor is calcined in air at 700-1000°C for 2-10 hours to obtain La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ .

[0029] (2)La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ Preparation of the cathode layer: the mass ratio of 1 to 5% La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ The powder is mixed with PVB with a mass ratio of 1-5%, 1-5% PVP, 1-10ml terpineol, 1% graphite powder and ethanol, and ball milled for 2-10 hours to form a ...

Embodiment 2

[0037] (1) Synthesis of Pr 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ Nanopowder: Pr(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O was dissolved in deionized water, and then EDTA and citric acid were added according to the ratio of the total number of metal ions: EDTA: citric acid (number of moles) = 1:1:1.2, and then NH 3 ·H 2 O to adjust the pH value of the solution to 6-10. Evaporate and concentrate at 80-90° C. to obtain a reddish-brown gel. The gel is heated in an air atmosphere at 200-400° C. for 5-8 hours to obtain a precursor. The precursor is calcined in air at 700-1000°C for 2-10 hours to obtain Pr 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ .

[0038] (2) Preparation of the cathode layer: the obtained Pr 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ The powder is mixed with 1-5% PVB, 1-5% PVP, 1-10ml terpineol and ethanol, and ball milled for 2-10 hours to form a slurry mixture; heat the GDC electrolyte ceramic sheet on an electric heating plate to 100...

Embodiment 3

[0041] (1) Synthesis of Ga 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ Nanopowder: take Ga(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O was dissolved in deionized water, and then EDTA and citric acid were added according to the ratio of the total number of metal ions: EDTA: citric acid (number of moles) = 1:1:1.2, and then NH 3 ·H 2 O to adjust the pH value of the solution to 6-10. Evaporate and concentrate at 80-90° C. to obtain a reddish-brown gel. The gel is heated in an air atmosphere at 200-400° C. for 5-8 hours to obtain a precursor. The precursor is calcined in air at 700-1000°C for 2-10 hours to obtain Ga 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ .

[0042] (2) Ga 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ Cathode layer preparation: Ga 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ The powder is mixed with PVB with a mass ratio of 1-5%, 1-5% PVP, 1-10ml terpineol, 1% graphite powder and ethanol, and ball milled for 2-10 hours to form a slurry mixture; Gadolinium...

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Abstract

The invention relates to a preparation method of a cathode of a low-medium temperature solid oxide fuel cell, belonging to the technical field of fuel cells. The preparation method comprises the following steps of: preparing a cathode layer chief source by spraying cathode slurry on an electrolytic substrate and drying at the temperature of 100-400 DEG C; and then sintering at 800-1300 DEG C in an air environment for 2-10 hours so as to obtain the cathode of the fuel cell, wherein temperature rise rate is 5-20 DEG C/minute. The invention solves the problems of overhigh oxygenic concentration polarization and higher cathodic polarization impedance which are caused by difficult structure control, poor preparation repeatability and slower oxygenic cathodic transmission of a cathode layer of the prior common low-medium temperature solid oxide fuel cell and prepares the cathode layer which has specific lamellar structure, needs no template and can be prepared easily and repeatedly by selecting a powder synthesis process, calcining temperature and temperature rise rate, thereby obviously enhancing the cathode performance.

Description

technical field [0001] The invention relates to a method in the field of fuel cell technology, in particular to a method for preparing a cathode of a medium-low temperature solid oxide fuel cell. Background technique [0002] Solid oxide fuel cell (SOFC) is an environmentally friendly energy conversion device that has attracted much attention due to its high efficiency, low emission, flexible fuel use, and combined heat and power. The medium and low temperature of SOFC (500-800°C) can expand the selection range of battery materials and electrode connection materials, effectively reduce the cost of SOFC, and is conducive to its long-term stable operation and rapid opening and closing. However, as the operating temperature decreases, the high cathode overpotential is one of the bottlenecks hindering the performance improvement and cost reduction of SOFC single cells. Cobalt-Fe-Based Perovskite Mixed Ionic Conductor Oxide Ln 1-x Sr x co 1-y Fe y o 3-δ (Ln = rare earth ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 尹屹梅佟泽郭亚琴马紫峰
Owner SHANGHAI JIAO TONG UNIV
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