Alternative anode material for solid oxide fuel cells
Anode materials comprising various compositions of strontium iron cobalt molybdenum oxide (SFCM) for low- or intermediate-temperature solid oxide fuel cell (SOFCs) are provided. These materials offer high conductivity achievable at intermediate and low temperatures and can be used to prepare the anode layer of a SOFC. A method of making a low- or intermediate temperature SOFC having an anode layer including SFCM is also provided.
1. An oxide composition comprising:
SrM 1 x M 2 ((1−x)/2) Mo ((1−x)/2) O 3±δ
wherein:
M 1 is a transition metal;
M 2 is a transition metal;
wherein M 1 does not equal M 2 , and neither M 1 nor M 2 is Mo;
x is about 0.1-0.4; and
δ is about 0-1.5.
2. The oxide composition of claim 1 , wherein x is about 0.1-0.3.
3. The oxide composition of claim 1 , wherein x is about 0.1-0.25.
4. The oxide composition of claim 1 , wherein M 1 is Fe and M 2 is Co.
5. The oxide composition of claim 1 , comprising SrFe 0.1 Co 0.45 Mo 0.45 O 3 , SrFe 0.2 Co 0.4 Mo 0.4 O 3 , SrFe 0.34 Co 0.33 Mo 0.33 O 3 , or SrFe 0.5 Co 0.25 Mo 0.25 O 3 .
6. The oxide composition of claim 1 , which comprises SrFe 0.2 Co 0.4 Mo 0.4 O 3 .
7. The oxide composition of claim 1 , which comprises SrFe 0.1 Co 0.45 Mo 0.45 O 3 .
8. The oxide composition of claim 1 , wherein the oxide composition has a conductivity of between 10 S/cm and 100 S/cm when measured at a temperature between 350° C. and 850° C.
9. The oxide composition of claim 1 , wherein the oxide composition is infiltrated with a multivalent transition metal.
10. The oxide composition of claim 9 , wherein the multivalent transition metal is Ni or Ni-GDC.
11. An oxide composition comprising:
SrM 1 x M 2 ((1−x)/2) Mo ((1−x)/2) O 3±δ
wherein:
M 1 is a transition metal;
M 2 is a transition metal;
wherein M 1 does not equal M 2 , and neither M 1 nor M 2 is Mo;
x is about 0.1-0.5;
δ is about 0-1.5; and
the oxide composition is porous.
12. The oxide composition of claim 11 , wherein x is about 0.1-0.4.
13. The oxide composition of claim 11 , wherein x is about 0.1-0.3.
14. The oxide composition of claim 11 , wherein x is about 0.1-0.25.
15. The oxide composition of claim 11 , wherein M 1 is Fe and M 2 is Co.
16. The oxide composition of claim 11 , comprising SrFe 0.1 Co 0.45 Mo 0.45 O 3 , SrFe 0.2 Co 0.4 Mo 0.4 O 3 , SrFe 0.34 Co 0.33 Mo 0.33 O 3 , or SrFe 0.5 Co 0.25 Mo 0.25 O 3 .
17. The oxide composition of claim 11 , which comprises SrFe 0.2 Co 0.4 Mo 0.4 O 3 .
18. The oxide composition of claim 11 , which comprises SrFe 0.1 Co 0.45 Mo 0.45 O 3 .
19. The oxide composition of claim 11 , wherein the oxide composition is infiltrated with a multivalent transition metal.
20. The oxide composition of claim 19 , wherein the multivalent transition metal is Ni or Ni-GDC.