Cathode material for solid-oxide fuel cell and method for preparing the same

A solid oxide and cathode material technology, which is applied to fuel cell components, battery electrodes, circuits, etc., can solve the problems of high operating temperature of SOFC, sintering of precious metal particles, and increase of battery interface polarization resistance.

Inactive Publication Date: 2009-02-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But conventional SOFCs operate at temperatures as high as 1000°C
Such a high operating temperature can ensure a sufficiently high oxygen ion conductivity of the electrolyte and a good catalytic activity of the cathode for oxygen, but it also introduces a series of problems: promoting the sintering of the porous electrode and accelerating the interfacial phase reaction between the electrode and the electro

Method used

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Examples

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Effect test

Embodiment 1

[0029] La 0.76 Sr 0.19 Ag 0.05 MnO 3-δ Preparation and application of cathode materials.

[0030] La 0.76 Sr 0.19 Ag 0.05 MnO 3-δ It is synthesized by EDTA-citric acid joint complexation method, which belongs to sol-gel method. Sr(NO 3 ) 2 , La(NO 3 ) 3 , AgNO 3 and Mn(CH 3 COO) 2 Dissolve in deionized water in proportion to make a mixed solution, according to the molar ratio of metal ion: EDTA: citric acid: ammonia water is 0.1: 0.1: 0.2: 1, add an appropriate amount of EDTA-ammonia solution and citric acid, stir and clarify the The precursor solution was evaporated on a heating platform at 80°C to remove water to make it into a gel, and then placed in a blast drying oven at 250°C for 8 hours to obtain a solid precursor, which was calcined at a high temperature for 5 hours to obtain La 0.76 Sr 0.19 Ag 0.05 MnO 3-δ Cathode powder. figure 1 It is the X-ray diffraction patterns of the cathode material after firing at different temperatures. The results prove ...

Embodiment 2

[0035] LaCo 0.38 Fe 0.57 PD 0.05 o 3-δ Preparation and application of cathode materials.

[0036] LaCo 0.38 Fe 0.57 PD 0.05 o 3-δ It is synthesized by glycine combustion method, which belongs to self-combustion method. La(NO 3 ) 3 , Co(NO 3 ) 2 and PdCl 2 Dissolve in deionized water in proportion to make a mixed solution, add an appropriate amount of glycine according to the molar ratio of metal ion: glycine is 1:2, and evaporate the precursor solution after stirring and clarification on a heating platform at 80°C to remove water and make it into a solidified solution. Colloidal, then placed in a blast drying oven at 250 ° C to trigger spontaneous combustion to obtain LaCo 0.38 Fe 0.57 PD 0.05 o 3-δ Cathode powder. Figure 6 It is the X-ray diffraction pattern of the cathode material prepared after calcination at 800°C for 5 hours. The results prove that the cathode material can be formed after self-combustion.

[0037] 5 g LaCo was processed by high-energy ...

Embodiment 3

[0040] La 0.4 Ca 0.4 Ag 0.15 PD 0.05 V 0.3 co 0.7 o 3-δ Preparation of cathode materials.

[0041] La 0.4 Ca 0.4 Ag 0.15 PD 0.05 V 0.3 co 0.7 o 3-δ It is synthesized by EDTA-citric acid joint complexation method, which belongs to sol-gel method. La(NO 3 ) 3 , Ca(NO 3 ) 2 , AgNO 3 , Co(NO 3 ) 2 , PdCl 2 and VCl 3 Dissolve in deionized water in proportion to make a mixed solution, add an appropriate amount of EDTA-ammonia solution and citric acid according to the molar ratio of metal ion: EDTA: citric acid: ammonia water is 0.05: 0.05: 0.1: 1, stir and clarify the The precursor solution was evaporated on a heating platform at 100°C to remove water to make it into a gel, and then placed in a blast drying oven at 300°C for 5 hours to obtain a solid precursor, which was calcined at a high temperature for 8 hours to obtain La 0.4 Ca 0.4 Ag 0.15 PD 0.05 V 0.3 co 0.7 o 3-δ Cathode powder.

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Abstract

The invention relates to a solid oxide fuel battery cathode material and a preparation method thereof. The chemical formula of the material is MxA(1-x)M`yB(1-y)O(3-Delta). The material is prepared by adopting an EDTA-citrate combination and complexation method or a glycine combustion method. The cathode material can be smeared onto the electrolyte surface by screen printing, spraying, dip coating or flow casting, and then calcined at high temperatures to obtain a cathode catalyst layer. The catalyst layer is in the working state, that is, the negative current passes through the electrode, so that the precious metal oxides can obtain electrons to take the reduction reaction, emerge out of the lattice of the perovskite or perovskite-like ceramic material to enrich on the surface of the material and to form the precious metal-ceramic composite cathode. The precious metals can be re-oxidized and enter the ceramic oxide lattice when the positive current passes through the electrode.

Description

technical field [0001] The invention belongs to the fields of new energy, material processing and electric power, and in particular relates to a solid oxide fuel cell cathode material and a preparation method thereof. Background technique [0002] Energy is the foundation of economic development, without the development of the energy industry there would be no modern civilization. Human beings have been making unremitting efforts to use energy more efficiently. There have been many revolutionary changes in the way of energy utilization in history, from the original steam engine to steam turbine, high-pressure steam turbine, internal combustion engine, and gas turbine. Every change in the way of energy utilization has greatly promoted the development of modern civilization. With the development of modern civilization, people gradually realize that there are two major drawbacks in the traditional way of energy utilization. One is that the chemical energy stored in the fuel m...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/02
CPCY02E60/50
Inventor 邵宗平周嵬冉然高冬梅金万勤
Owner NANJING UNIV OF TECH
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