SOLID OXIDE FUEL CELL

• US 20140315116A1
• Filed: 06/13/2014
• Published: 10/23/2014
• Est. Priority Date: 12/19/2011
• Status: Active Grant

• Current Assignee: NGK Insulators Limited
• Original Assignee: NGK Insulators Limited
• Inventors: OHMORI, Makoto, KOBAYASHI, Ayano, FUJISAKI, Shinji
• Granted Patent: US 10,056,620 B2
• Time in Patent Office: Days
• US Class Current: 429/482
• CPC Class Codes: B01J 23/002 Mixed oxides other than spinels, e.g. perovskite
• CPC Class Codes: B01J 23/83 with rare earths or actinides
• CPC Class Codes: B01J 2523/00 Constitutive chemical elements of heterogeneous catalysts
• CPC Class Codes: B01J 2523/24 Strontium
• CPC Class Codes: B01J 2523/305 Boron
• CPC Class Codes: B01J 2523/3706 Lanthanum
• CPC Class Codes: B01J 2523/51 Phosphorus
• CPC Class Codes: B01J 2523/67 Chromium
• CPC Class Codes: B01J 2523/842 Iron
• CPC Class Codes: B01J 2523/845 Cobalt
• CPC Class Codes: B01J 2523/847 Nickel
• CPC Class Codes: B01J 27/188 with chromium, molybdenum, tungsten or polonium
• CPC Class Codes: B01J 35/33 Electric or magnetic properties
• CPC Class Codes: C04B 2235/3213 Strontium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3227 Lanthanum oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3275 Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite
• CPC Class Codes: C04B 2235/3279 Nickel oxides, nickalates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/5436 micrometer sized, i.e. from 1 to 100 micron
• CPC Class Codes: C04B 2235/5445 submicron sized, i.e. from 0,1 to 1 micron
• CPC Class Codes: C04B 2235/72 Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
• CPC Class Codes: C04B 2235/725 : Metal content
• CPC Class Codes: C04B 2235/727 : Phosphorus or phosphorus compound content
• CPC Class Codes: C04B 2235/768 : Perovskite structure ABO3
• CPC Class Codes: C04B 35/01 : based on oxide ceramics
• CPC Class Codes: C04B 35/26 : based on ferrites
• CPC Class Codes: H01M 2008/1293 : Fuel cells with solid oxide electrolytes
• CPC Class Codes: H01M 4/8663 : Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers
• CPC Class Codes: H01M 4/9033 : Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites
• CPC Class Codes: H01M 8/0202 : Collectors; Separators, e.g. bipolar separators; Interconnectors
• CPC Class Codes: H01M 8/0217 : Complex oxides, optionally doped, of the type AMO3, A being an alkaline earth metal or rare earth metal and M being a metal, e.g. perovskites
• CPC Class Codes: Y02E 60/50 : Fuel cells

Abstract

A solid oxide fuel cell includes a cathode, and an anode, and a solid electrolyte layer disposed between the cathode and the anode. The cathode includes a complex oxide having a perovskite structure expressed by the general formula ABO₃. A standard deviation value for the atomic percentage of respective elements at the A site measured using energy dispersive X-ray spectroscopy at 10 spots in a single field on the sectional surface of the cathode is no more than 10.4.

Claims

1. A solid oxide fuel cell comprising:

a cathode including a complex oxide having a perovskite structure expressed by the general formula ABO₃;

an anode; and

a solid electrolyte layer disposed between the cathode and the anode,

a standard deviation value for an atomic percentage of respective elements at the A site measured using energy dispersive X-ray spectroscopy at 10 spots in a single field on a sectional surface of the cathode being no more than 10.4.

2. The solid oxide fuel cell according to claim 1, wherein

a standard deviation value for the atomic percentage of respective elements at the B site measured using energy dispersive X-ray spectroscopy at 10 spots in a single field is less than or equal to 5.03.

3. The solid oxide fuel cell according to claim 1, wherein

the A site is selected from the group including La and Sr.

4. The solid oxide fuel cell according to claim 1, wherein

at least one atom of Co and Fe is included at the B site.

5. The solid oxide fuel cell according to claim 1, wherein

the complex oxide is (La, Sr)(Co, Fe)O₃, (La, Sr)FeO₃, (La, Sr)CoO₃, or La(Ni, Fe)O₃.

6. The solid oxide fuel cell according to claim 1, wherein

the single field is a range observed by an electron microscope with a magnification of 100 times to 5000 times.

7. The solid oxide fuel cell according to claim 1, wherein

a size of the respective 10 spots is no more than 1 micrometer.

8. The solid oxide fuel cell according to claim 1, wherein

the position of the 10 spots is selected from the single field on the basis of the concentration level in 10 stages determined in response to a distribution of the atomic percentage in the single field.

9. The solid oxide fuel cell according to claim 8, wherein

the concentration level of the 10 stages is set across an entire range of the distribution of the atomic percentage in the single field.

10. A solid oxide fuel cell comprising:

a cathode including a complex oxide having a perovskite structure expressed by the general formula ABO₃;

an anode; and

a solid electrolyte layer that is disposed between the cathode and the anode,

a standard deviation value for the atomic percentage of respective elements at the B site measured using energy dispersive X-ray spectroscopy at 10 spots in a single field on a sectional surface of the cathode being less than or equal to 5.03.