Medium and low temperature solid oxide fuel cell cathode material

A fuel cell cathode, solid oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high thermal expansion coefficient and oxygen loss, and achieve the effect of high electrical conductivity and low thermal expansion rate

Inactive Publication Date: 2013-05-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

where LnBaCo 2 o 5+δ It has the advantages of good catalytic activity and high electrical conductivity, but when the A site is Pr, its thermal expansion coefficient will be high, and a large amount of oxygen will be lost at high temperature

Method used

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  • Medium and low temperature solid oxide fuel cell cathode material
  • Medium and low temperature solid oxide fuel cell cathode material
  • Medium and low temperature solid oxide fuel cell cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 : 0.02 mol Pr 0.7 Y 0.3 BaCo 2 o 5+δ Synthesis, conductivity test and impedance test.

[0021] Weigh 2.38 g Pr 6 o 11 (analytically pure), 0.68 g Y 2 o 3 (analytical grade), 3.94 g BaCO 3 (analytical pure), 9.96 g C 4 h 6 o 4 Co 4H 2 O (analytically pure). Grind the above materials in a ball mill jar for 4 hours to make them evenly mixed, using agate balls as grinding media, and alcohol as a dispersant. Dry the uniformly mixed slurry, and the dried material is at 1000 o C was calcined for 10 hours to obtain the desired cathode material Pr 0.7 Y 0.3 BaCo 2 o 5+δ . The prepared powder is determined by XRD powder diffraction method to be a tetragonal double perovskite structure, such as figure 1 shown.

[0022] Add 1% (mass ratio) of PVA to the prepared powder, mix and dry, dry press at 110 MPa, and dry in air at 1200 o C was calcined for 10 hours to obtain a dense cathode material, which can be used for the determination of electrical cond...

Embodiment 2

[0024] Example 2 : 0.02 mol Pr 0.5 Y 0.5 BaCo 2 o 5+δ Synthesis, conductivity test and impedance test.

[0025] Weigh 1.7 g Pr 6 o 11 (analytically pure), 1.12 g Y 2 o 3 (analytical grade), 3.94 g BaCO 3 (analytical pure), 9.96 g C 4 h 6 o 4 Co 4H 2 O (analytically pure). Grind the above materials in a ball mill jar for 4 hours to make them evenly mixed, using agate balls as grinding media, and alcohol as a dispersant. Dry the uniformly mixed slurry, and the dried material is at 1000 o C was calcined for 10 hours to obtain the desired cathode material Pr 0.5 Y 0.5 BaCo 2 o 5+δ . The prepared powder is determined by XRD powder diffraction method to be a tetragonal double perovskite structure, such as figure 1 shown.

[0026] Add 1% (mass ratio) of PVA to the prepared powder, mix and dry, dry press at 110 MPa, and dry in air at 1200 o C was calcined for 10 hours to obtain a dense cathode material, which can be used for the determination of electrical condu...

Embodiment 3

[0028] Example 3 : 0.02 mol Pr 0.3 Y 0.7 BaCo 2 o 5+δ Synthesis, conductivity test and impedance test.

[0029] Weigh 1.02 g Pr 6 o 11 (analytically pure), 1.58 g Y 2 o 3 (analytical grade), 3.94 g BaCO 3 (analytical pure), 9.96 g C 4 h 6 o 4 Co 4H 2 O (analytically pure). Grind the above materials in a ball mill jar for 4 hours to make them evenly mixed, using agate balls as grinding media, and alcohol as a dispersant. Dry the uniformly mixed slurry, and the dried material is at 1000 o C was calcined for 10 hours to obtain the desired cathode material Pr 0.3 Y 0.7 BaCo 2 o 5+δ . The prepared powder is determined by XRD powder diffraction method to be a tetragonal double perovskite structure, such as figure 1 shown.

[0030] Add 1% (mass ratio) of PVA to the prepared powder, mix and dry, dry press at 110 MPa, and dry in air at 1200 o C was calcined for 10 hours to obtain a dense cathode material, which can be used for the determination of electrical cond...

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Abstract

The invention relates to an A-site Y element doped double perovskite type solid oxide fuel cell cathode material. The cathode material is characterized in that Y doping of the double perovskite type PrBaCo2O5+delta material is carried out on A site, and a molecular formula is Pr1-xYxBaCo2O5+delta, wherein x is 0.2-0.7. The produced solid oxide fuel cell cathode material has the advantages of high conductivity, low thermal expansivity and polarization resistance, The cathode characteristic is superior to that of PrBaCo2O5+delta and GdBaCo2O5+delta. The conductivity of Pr1-xYxBaCo2O5+delta (x=0.3, 0.5, 0.7) at 600 DEG C is 711S/cm, 566S/cm, 416S/cm, the thermal expansion coefficient at 30-800 DEG C is about 17*10<-6> DEG C, and polarization resistance of the material at 700 DEG C is less than 0.2 omega cm<2>. The cathode material is suitable for the medium and low temperature solid oxide fuel cell (SOFC) cathode material.

Description

technical field [0001] The invention relates to a cathode material, in particular to a solid oxide fuel cell cathode material. Background technique [0002] Traditional solid oxide fuel cells due to their high operating temperature (1000 o C or so) lead to the problems of its poor stability and short lifetime. At present, reducing the operating temperature of solid oxide fuel cells and developing medium and low temperature solid oxide fuel cells have become one of the research hotspots in the field of solid oxide fuel cells. However, as the operating temperature decreases, the catalytic activity of the cathode decreases significantly. Traditional high temperature solid oxide fuel cell cathode material La 1-x Sr x MnO 3 (LSM) due to its 800 o The lower conductivity and catalytic activity below C are no longer suitable for medium and low temperature solid oxide fuel cells. In the ohmic loss of the entire solid oxide fuel cell system, the ohmic loss of the cathode accou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCY02E60/50
Inventor 赵海雷郑雨沈永娜杜志鸿严春林
Owner UNIV OF SCI & TECH BEIJING
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