Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. WO2012018297 - PILE À COMBUSTIBLE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1 . A fuel cell comprising a conducting body with a first and a second end surface for collecting currents, wherein said body comprises at least one composite material comprising:

- at least one semiconducting metal oxide of n and/or p type, and

- at least one ionic conducting material.

2. A fuel cell according to claim 1 , wherein said at least one semiconducting metal oxide comprises at least one transition metal.

3. A fuel cell according to claim 2, wherein said at least one semiconducting metal oxide comprises Li, Ni, Cu, Fe, Zn and/or Co.

4. A fuel cell according to claim 2 or 3, wherein said at least one

semiconducting metal oxide comprises LiNiO2, LiCoO2, LiCoFeOx and/or other oxides of Li Ni and/or LiCoFe.

5. A fuel cell according to any one of claims 2-4, wherein said at least one semiconducting metal oxide comprises Li:Ni:Zn in molar ratios of about 1 :4:5 or 2:4:4.

6. A fuel cell according to claim any one of claims 2-4, wherein said at least one semiconducting metal oxide comprises molar ratios of Li : Ni of about 5:5, Li:Co of about 5:5 and/or Li:Co:Fe of about 3:2:5.

7. A fuel cell according to any previous claim, wherein said ionic conducting material comprises ionic doped ceria.

8. A fuel cell according to claim 7, wherein the ionic doped ceria is described by MxCe1 -xO2, wherein M is a dopant.

9. A fuel cell according to claim 8, wherein M is selected from Ca2+, Sr2+, Gd3+, Sm3+ and Y3+.

10. A fuel cell according to claim 8 or 9, wherein the molar ratio of M to Ce1-xO2 is equal to or below 20%.

1 1 . A fuel cell according to any one of claims 1 -7, wherein said ionic conducting material comprises Y2O3-doped BaCeO3 (BCY).

12. A fuel cell according to claim 7, wherein the ionic doped ceria comprises Gd3+ or Sm3+ doped ceria (GDC or SDC) and/or their nanocomposites.

13. A fuel cell according to claim 12, wherein the ionic doped ceria comprises nanocomposites of Ce0.8Sm0.2O2-δ.

14. A fuel cell according to claim 13, wherein the ionic doped ceria comprises Na2CO3-Ce0.8Sm0.2O2-δ .

15. A fuel cell according to any one of claims 1 -6, wherein the ionic

conducting material comprises praseodymium in a mixture with lanthanum and cerium (LCP).

16. A fuel cell according to claim 15, wherein the ionic conducting material further comprises at least one alkaline or alkaline earth carbonate.

17. A fuel cell according to claim 16, wherein the at least one alkaline or alkaline earth carbonate is MxCO3, wherein M is Li, Na, K, Ca, Sr or Ba and x is 1 or 2.

18. A fuel cell according to any previous claim, wherein said body comprises a second composite material comprising barium copper sulfur fluoride (BCSF) and SDC.

19. A fuel cell according to claim 18, wherein the BCSF is

Ba0.6Sr0.4Co0.85Fe0. 15.

20. A fuel cell according to claim 18 or 19, wherein the SDC is

Ce0.8Sm0.2O2-δ.

21 . A fuel cell according to any previous claim, wherein the weight ratio of the at least one semiconducting metal oxide to the at least one ionic conducting material is between about 80:20 and 20:80, such as about 40:60.

22. A fuel cell according to any previous claim, wherein the conducting body further comprises a redox catalyst.

23. A fuel cell according to claim 22, wherein the redox catalyst comprises Fe.

24. A fuel cell according to any previous claim, wherein said composite material is porous.

25. A fuel cell according to claim 24, wherein the porosity of the composite material is about 30-40 %.

26. A fuel cell according to any previous claim, wherein said a first end surface for collecting current is arranged to be in contact with oxygen (O) and said second end surface for collecting current is arranged to be in contact with hydrogen (H2).

27. A fuel cell according to any previous claim, wherein said first and/or second end surface for collecting current comprises silver (Ag) or nickel (Ni)-foam.

28. A method for producing a composite material mixture for a fuel cell comprising the steps of

a) providing at least one semiconducting metal oxide of n and/or p type and at least one ionic conducting material in a mixture;

b) heating said mixture to provide said composite material.

29. A method according to claim 28, wherein the step of heating is performed at a temperature between 600-800 °C, such as about 700 °C.

30. A method according to claim 28 or 29, wherein the at least one

semiconducting metal oxide of n and/or p type and/or the at least one ionic conducting material is as described in any one of claims 2-21 .

31 . A method according to any one of claims 28-30, wherein the ionic conducting material comprises praseodymium in a mixture with lanthanum and cerium (LCP) and step a) further comprises addition of at least one alkaline or alkaline earth carbonate to the mixture.

32. A method according to claim 31 , wherein the at least one alkaline or alkaline earth carbonate is MxCO3, wherein M is Li, Na, K, Ca, Sr or Ba and x is 1 or 2.

33. A method according to any one of claims 28-32, wherein step a) further comprises adding at least one redox catalyst to said mixture.

34. A method according to any one of claims 28-33, wherein step a) further comprises adding a composite comprising BCSF or SDC.

35. A method according to claim 34, wherein the BCSF is

Ba0.6Sr0.6Co0.85Fe0.15

36. A method according to claim 34 or 35, wherein the SDC is Ce0.8Sm0.2O2-δ.

37. A method according to any one of claims 28-36, wherein the composite material is in powder form.

38. A method according to any one of claims 28-37, wherein the composite material is porous.

39. A composite material obtainable according to any one of claims 28-38.

40. A method for producing a fuel cell comprising the steps of

a) providing a composite powder comprising at least one semiconducting metal oxide of n and/or p type and at least one ionic conducting material; b) pressing said composite powder to form a tablet; and

c) pasting the end surfaces of the tablet with silver (Ag) and/or nickel (Ni)-foam to form current collecting end surfaces.

41 . A method according to claim 40, wherein step b) comprises pressing said composite powder uniaxially with a load of about 100-300 MPa.

42. A method according to claim 40 or 41 , wherein the composite powder of step a) has been prepared according to any one of claims 28-38.

43. A method according to any one of claims 40-42, wherein the at least one semiconducting metal oxide of n and p type and/or the at least one ionic conducting material is as disclosed in any one of claims 2-25.

44. Use of at least one composite material comprising at least one

semiconducting metal oxide of n and/or p type and at least one ionic conducting material in a fuel cell.

45. Use of at least one composite material comprising at least one

semiconducting metal oxide of n and/or p type and at least one ionic conducting material together with a composite material comprising a BSCF and a SDC in a fuel cell.

46. Use according to claim 45, wherein the BSCF is Ba0.6Sr0.4Co0.85Fe0.15.

47. Use according to claim 45 or 46, wherein the SDC is Ce0.8Sm0.2O2-δ.