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Ternary complex cathode material of intermediate/low temperature solid-oxide fuel battery

A solid oxide and cathode material technology, applied in fuel cells, fuel cell parts, battery electrodes, etc., can solve problems such as gaps, easy carbon deposition and deactivation of nickel-based anodes, and achieve high structural stability, The effect of good chemical stability and excellent electrochemical activity

Inactive Publication Date: 2008-10-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 5. When hydrocarbons are used as fuel, nickel-based anodes are prone to carbon deposition and deactivation
However, so far, there is still a considerable gap between the research progress of cathode materials and the requirements for relevant cathode materials for practical medium and low temperature solid oxide fuel cells.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Oxygen ion conductor Sm 0.15 Ce 0.85 o 2-δ (SDC), Gd 0.20 Ce 0.80 o 2-δ (GDC) and La 0.25 Ce 0.75 o 2-δ (LDC), an oxygen ion-electron mixed conductor La 0.70 Sr 0.30 CoO 3-δ 、Sm 0.50 Sr 0.50 CoO 3-δ and Gd 0.60 Sr 0.40 CoO 3-δ , the oxygen catalytic active material Cat is synthesized by EDTA-CitricAcid complexation method with nitrate as the starting material. According to the molar ratio of various metal ions in the oxide to be synthesized, pipette the corresponding stoichiometric metal ion nitrate solution and the beaker, and add an appropriate amount of EDTA and citric acid therein, that is, the ratio of EDTA and citric acid to the total metal ions The ratios of the amounts of substances are 1:1 and 1:1.5, respectively. Then use NH 3 .H 2 O to adjust the pH of the solution to 7.0, heat and stir the solution at a constant temperature of 80°C, transfer it to an evaporating dish after the solution is highly concentrated, place it on an electric furnac...

Embodiment 2

[0047] According to the ratio of 1:1, weigh the appropriate amount of NiO and GDC powder respectively and put them in the mortar, add an appropriate amount of absolute ethanol after fully grinding, and grind again in a fluid state to maximize the uniform mixing of the two powders , after drying with an infrared lamp, in order to improve the tableting performance of the powder, add an appropriate amount of anhydrous ethanol solution of polyvinyl butyral (PVB), aqueous solution of polyvinylpyrrolidone (PPD) and polyethylene glycol (PEG), etc., mix again and dry. Weigh 2g of powder and place in In the 22 mold, it is preliminarily formed under a pressure of 100Mpa, and then 40mg of SDC powder is evenly spread on it, and finally formed under a pressure of 250Mpa. The above-mentioned plain sheet was treated at 1400°C for 4 hours to obtain an anode-supported anode-electrolyte complex.

Embodiment 3

[0049] Weigh an appropriate amount of SSC and SDC powders according to the mass ratio of 7:3, add appropriate amount of terpineol, polyethylene glycol, and dibutyl phthalate to prepare ink form; also weigh according to the mass ratio of 1:1 Take an appropriate amount of SSC and Cat powder, add an appropriate amount of terpineol, polyethylene glycol, and dibutyl phthalate to prepare an ink shape. The SSC&SDC layer is coated on the anode supported by the anode and the electrolyte side of the electrolyte complex by the DoctorBlade scraping method. After pre-fired at 600°C, the SSC&Cat layer is coated with the same method, and then treated at 950°C for 3 hours to obtain a double electrode Single cell configuration: NiO-GDC / .SDC / SDC&SSC-SSC&Cat. Figure 4~7 SEM photographs of different functional components of the single cell after electrochemical testing. in Figure 4 is the general view of the cathode surface, Figure 5 is the cross-sectional view of the cathode, Figure 6 is...

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Abstract

The invention discloses a novel ternary composite cathode material for a medium and low temperature solid oxide fuel cell, which comprises an oxygen ion conductor oxide, an electronic-oxygen ion mixed conductor oxide and an oxygen catalytic reduction active matter. The material is characterized in that: the cathode material taking perovskite structured oxygen ion and electronic mixed conductor as the main body has the main function of catalytically reducing the gaseous oxygen at the surface as oxygen ions and transmitting the oxygen ions in an manner of bulk phase to the interface between an electrolyte and the cathode; the conductivity of the oxygen ions is improved by adding the oxygen ion conductor, thereby improving the bulk phase transmission speed of the oxygen ions; the speed of the surface oxygen exchange of the cathode material is obviously increased by adding the oxygen catalytic reduction active matter, thereby greatly enhancing the catalytic activity of the surface oxygen of the cathode material. All effective components of the ternary composite cathode material are synthesized by adopting nitrate by an EDTA-citric acid complex method. Shown in single cell tests, the ternary composite cathode material shows not only excellent comprehensive performance but also excellent compatibility among all the effective components.

Description

Technical field: [0001] The present invention relates to YSZ base electrolyte, CeO 2 Based electrolyte, LSGM-based electrolyte, synthesis of low-temperature solid oxide fuel cell cathode materials and preparation of corresponding battery cathodes. Background technique: [0002] Solid oxide fuel cell (Solid oxide fuel cell, SOFC), as one of the main types of fuel cells, is an energy conversion device that directly converts chemical energy in fuel into electrical energy. [0003] The solid oxide fuel cell is mainly composed of three functional modules, anode (Negative Electrode), electrolyte (Electrolyte), cathode (Positive Electrode), referred to as PEN structure. The main function of the cathode module is to convert the gaseous O 2 Revert to O 2- ions, and transport them to the cathode-electrolyte interface; the role of the electrolyte is to transport the O 2- The ions are transported to the interface between the anode and the electrolyte through the vacancy transition m...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/86H01M8/0297
CPCY02E60/50
Inventor 杨维慎张海洲丛铀
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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