Gas phase modification of solid oxide fuel cells

Patent metadata

Field	Value
Publication number	US-9666891-B2
Application number	US-201414504774-A
Country	US
Kind code	B2
Filing date	Oct 2, 2014
Priority date	Oct 8, 2013
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A solid oxide fuel cell comprising an electrolyte, an anode and a cathode. In this fuel cell at least one electrode has been modified with a promoter using gas phase infiltration.

First claim

The invention claimed is:

1. A solid oxide fuel cell, comprising:
an electrolyte;
an anode; and
a cathode,
wherein at least one electrode has been modified with a promoter layer, using gas phase infiltration, having a thickness from 1 nm to 1000 nm, wherein the electrode is infiltrated with the promoter selected from the group consisting Pr, Ce, Sn, Sm, Gd or combinations thereof, and
wherein the anode is pre-reduced at a temperature from 400° C. to 800° C. in a reducing atmosphere containing 1-100% hydrogen or other reducing gas atmospheres.

2. The solid oxide fuel cell of claim 1 , wherein the gas phase infiltration technique involves chemical vapor deposition.

3. The solid oxide fuel cell of claim 1 , wherein the gas phase infiltration technique involves physical vapor deposition.

4. The solid oxide fuel cell of claim 1 , wherein the electrode infiltrated is the anode.

5. The solid oxide fuel cell of claim 1 , wherein the electrode infiltrated is the cathode.

6. The solid oxide fuel cell of claim 1 , where the promoter is an oxide or a hydroxide.

7. The solid oxide fuel cell of claim 1 , where the promoter is an oxide or an hydroxide.

8. The solid oxide fuel cell of claim 1 , wherein the gas phase infiltration occurs at temperatures equal to or less than the temperature used for electrolyte sintering.

9. The solid oxide fuel cell of claim 1 , wherein the gas phase infiltration occurs at temperatures less than 1000° C.

10. The solid oxide fuel cell of claim 1 , wherein the gas phase infiltration occurs at temperatures less than 500° C.

11. The solid oxide fuel cell of claim 1 , wherein the infiltration occurs after the formation of the fuel cell.

12. The solid oxide fuel cell of claim 1 , wherein the electrolyte is selected from the group comprising of yittria stabilized zirconia, scandia stabilized zirconia, gadolinium doped ceria, samarium doped ceria, doped barium zirconate cerate, or combinations thereof.

13. The solid oxide fuel cell of claim 1 , wherein the cathode is selected from the group comprising of: lanthanum strontium iron cobalt oxide, doped ceria, strontium samarium cobalt oxide, lanthanum strontium iron oxide, lanthanum strontium cobalt oxide, barium strontium cobalt iron oxide, or combinations thereof.

14. The solid oxide fuel cell of claim 1 , wherein the anode is selected from the group comprising of: nickel oxide, nickel, yittria stabilized zirconia, scandia stabilized zirconia, gadolinium doped ceria, samarium doped ceria, doped barium zirconate cerate, or combinations thereof.

15. The solid oxide fuel cell of claim 1 , wherein the electrolyte comprises a Sc doped BZCY.

16. The solid oxide fuel cell of claim 1 , wherein the electrolyte comprises a porous BZCYYb electrolyte.

Assignees

• Phillips 66 Co

Inventors

• Bierschenk David M
• Liu Ying
• Liu Mingfei
• He Ting

Classifications

• H01M4/905

  specially used in fuel cell operating at high temperature, e.g. SOFC · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M4/8657

  layered · CPC title

• H01M2300/0074

  Ion conductive at high temperature · CPC title

• H01M4/9025

  Oxides specially used in fuel cell operating at high temperature, e.g. SOFC · CPC title