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Solid oxide fuel cell cathode material

A fuel cell cathode and solid oxide technology, which is applied to fuel cell components, battery electrodes, circuits, etc., can solve problems such as the inability to meet the basic requirements of intermediate temperature oxide fuel cell cathode materials, and reduce synthesis time and synthesis The effect of temperature

Inactive Publication Date: 2006-02-08
HEILONGJIANG UNIV
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Problems solved by technology

[0003] In order to solve the problem that the existing cathode materials cannot meet the basic requirements of intermediate temperature oxide fuel cell cathode materials, the present invention develops a new type of solid oxide fuel cell cathode material, that is, the development of K 2 NiF 4 The structure of the new medium temperature oxide fuel cell cathode material makes it have a relatively high oxygen ion-electron mixed conductivity in the medium and low temperature region (the mixed conductivity of the material in the air at 800°C is close to 100Scm -1 ), while having good chemical stability (sintered at 1000°C for 24 hours in an air atmosphere, the material does not chemically react with the YSZ electrolyte) and thermal stability (that is, the thermal expansion coefficient matched with the electrolyte)

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specific Embodiment approach 1

[0013]Specific embodiment 1: The general composition formula of the solid oxide fuel cell cathode material in this embodiment is A 1+x A' 1-x B 1-y B' y o 4±δ , where A is the main group of alkaline earth metals, A' is a rare earth element, B and B' are transition group metal elements, 0<x<1, 0≤y≤1, δ≤0.17.

[0014] A and A' in this embodiment represent alkaline earth elements (Ca, Sr, or Ba, etc.) and rare earth elements (La, Ce, Pr, Nd, Pm, Sm, Eu, or Gd, etc.) in the periodic table, respectively. B and B' are transition group metal elements (Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, W, V, Nb or Ta, etc.).

specific Embodiment approach 2

[0015] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that when A is Sr, A' is Sm, B is Ni, B' is Co, and δ=0, the solid oxide fuel cell cathode material The structural formula is Sr 1-x SM 1+x Ni 1-y co y o 4 .

specific Embodiment approach 3

[0016] Specific embodiment three: the difference between this embodiment and specific embodiment two is that when x=0.5 and y=0, the structural formula of the solid oxide fuel cell cathode material is Sr 0.5 SM 1.5 NiO 4 .

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Abstract

Disclosed is a cathode material for solid oxidate fuel battery. The composition general formula of the invented cathode material is A1+xA1-xíõB1-yByíõO4í‚delta, wherein A is main group alkali earth metal, Aíõ is rare-earth element, B and B' are transient elements, and 0<x<1ú¼0<=y<=1ú¼delta<=0.17. The said cathode material has high oxygen-ion-electron mixing conductivity rate which is higher than perovskite structure cathode material's in the range of 10-5 to 1atm of partial pressure of oxygen. The inventive cathode material has the advantages of good heat stability, chemical resistance and oxidation catalytic reduction property.

Description

Technical field: [0001] The invention relates to a cathode material, in particular to a solid oxide fuel cell cathode material. Background technique: [0002] The development of intermediate temperature oxide fuel cells has recently attracted attention. As the operating temperature decreases (600-800°C), the electrochemical performance of traditional cathode materials also decreases, and the polarization resistance increases. Research shows that La 0.85 Sr 0.15 MnO 3 (LSM) polarization resistance jumps from a few ohms at 1000°C to several thousand ohms at 800°C. Therefore, finding new cathode materials that can be used under medium temperature conditions has become an important task for the development of medium temperature fuel cells. The main solution at present is to develop oxygen ion-electron hybrid conductive materials. Generally speaking, the basic requirements for the cathode material of intermediate temperature oxide fuel cells are: the material has a relative...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/02
CPCY02E60/50
Inventor 赵辉霍丽华程晓丽孙丽萍高山
Owner HEILONGJIANG UNIV
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