Conductive, anticorrosive magnesium titanium oxide material

Patent metadata

Field	Value
Publication number	US-11420879-B2
Application number	US-202016825638-A
Country	US
Kind code	B2
Filing date	Mar 20, 2020
Priority date	Nov 6, 2019
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

An anticorrosive, conductive material includes a first oxide having oxygen vacancies and a formula (I): MgTi2O5-δ (I), where δ is any number between 0 and 3 optionally including a fractional part denoting the oxygen vacancies; and a second oxide having a formula (II): TiaOb (II), where 1<=a<=20 and 1<=b<=30, optionally including a fractional part, the first and second oxides of formulas (I) and (II) forming a polycrystalline matrix.

First claim

What is claimed is:

1. An anticorrosive, conductive material comprising:
a first oxide having oxygen vacancies and a formula (I):
MgTi 2 O 5-δ   (I),

where δ is any number between 0 and 3 including a fractional part denoting the oxygen vacancies; and
a second oxide having a formula (II):
Ti a O b   (II),

where 1<=a<=20 and 1<=b<=30, optionally including a fractional part,
the first and second oxides of formulas (I) and (II) forming a polycrystalline matrix.

2. The material of claim 1 , wherein the second oxide is metallic.

3. The material of claim 1 , wherein Ti a O b is Ti 2 O 3 .

4. The material of claim 3 , wherein Ti 2 O 3 forms a segregated polycrystalline phase.

5. The material of claim 3 , wherein Ti 2 O 3 is located within about 1 nm to about 100 μm from grain boundaries of the matrix.

6. The material of claim 1 , wherein the matrix comprises at least about 0.5 wt. % Ti a O b , based on the total weight of the material.

7. The material of claim 1 , wherein at least one of the first and second oxides of formulas (I) and (II) comprises a dopant including Ge, Nb, Mo, Sn, Ta, W, or a combination thereof.

8. The material of claim 1 , wherein at least one of the first and second oxides of formulas (I) and (II) comprises a conducting agent.

9. A fuel cell system comprising:
an anticorrosive, conductive polycrystalline matrix having:
a first metal oxide having oxygen vacancies and a formula (I):
MgTi 2 O 5-δ   (I),

where δ is any number between 0 and 3 including a fractional part denoting the oxygen vacancies; and
a second metal oxide having a formula (II):
Ti a O b   (II),

where 1<=a<=20 and 1<=b<=30, optionally including a fractional part.

10. The system of claim 9 , wherein Ti a O b is Ti 2 O 3 .

11. The system of claim 10 , wherein Ti 2 O 3 forms a segregated polycrystalline phase within the matrix.

12. The system of claim 10 , wherein Ti 2 O 3 is located about 1 nm to about 100 μm from grain boundaries of the matrix.

13. The system of claim 9 , wherein the matrix comprises about at least about 0.5 wt. % Ti a O b , based on the total weight of the matrix.

14. The system of claim 9 , wherein at least one of the first and second oxides comprises a dopant including Ge, Nb, Mo, Sn, Ta, W, or a combination thereof.

15. The system of claim 9 further comprising a bipolar plate including the anticorrosive, conductive polycrystalline matrix.

16. A fuel cell catalyst support material comprising:
a first metal oxide having oxygen vacancies and a formula (I):
MgTi 2 O 5-δ   (I),

where δ is any number between 0 and 3 including a fractional part denoting the oxygen vacancies; and
a second metal oxide having a formula (II):
Ti a O b   (II),

where 1<=a<=20 and 1<=b<=30, optionally including a fractional part,
the first and second oxides forming a polycrystalline matrix.

17. The material of claim 16 , wherein Ti a O b is Ti 2 O 3 .

18. The material of claim 17 , wherein Ti 2 O 3 forms a segregated polycrystalline phase.

19. The material of claim 17 , wherein Ti 2 O 3 is located about 1 nm to about 100 μm from grain boundaries of the matrix.

20. The material of claim 16 , wherein the matrix comprises at least about 0.5 wt. % Ti a O b , based on the total weight of the material.

Assignees

• Bosch Gmbh Robert

Inventors

• Kim Soo
• Mailoa Jonathan
• Cheng Lei
• Tuffile Charles

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• H01M8/0245

  in the form of layered or coated products · CPC title

• H01M4/9075

  Catalytic material supported on carriers, e.g. powder carriers (H01M4/8807, H01M4/881, H01M4/8814, H01M4/925 take precedence) · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title