All ceramics solid oxide fuel cell

Abstract

The present invention provides an all ceramics solid oxide cell, comprising an anode layer, a cathode layer, and an electrolyte layer sandwiched between the anode layer and the cathode layer, wherein the electrolyte layer comprises doped zirconia and has a thickness of from 40 to 300 μm; wherein the anode layer and the cathode layer both comprise doped ceria or both comprise doped zirconia; and wherein the multilayer structure formed of the anode layer, the electrolyte layer and the cathode layer is a symmetrical structure. The present invention further provides a method of producing said solid oxide cell.

1 - 13 . (canceled) 
     
     
         14 . A method of producing an all ceramics solid oxide cell, the solid oxide cell comprising an anode layer, a cathode layer, and an electrolyte layer sandwiched between the anode layer and the cathode layer,
 wherein:
 the electrolyte layer comprises doped zirconia and has a thickness of from 40 to 300 μm; 
 the anode layer and the cathode layer both comprise doped ceria or both comprise doped zirconia; and 
 the multilayer structure formed of the anode layer, the electrolyte layer and the cathode layer is a symmetrical structure, 
   the method comprising:
 (a) providing a first electrode precursor layer; 
 (b) forming an electrolyte layer on top of the first electrode precursor layer; 
 (c) forming a second electrode precursor layer on top of the electrolyte layer; and 
 (d) sintering the obtained multilayer structure. 
   
     
     
         15 . The method of  claim 14 , wherein the sintering temperature ranges from 1000° C. to 1300° C. 
     
     
         16 . The method of  claim 14 , further comprising the step of impregnating the electrode precursor layer which will form the cathode layer with a barrier material. 
     
     
         17 . The method of  claim 16 , wherein the barrier material is selected from (Ce 0.9 Gd 0.1 )O 2-δ  (i.e. CGO10) and (Ce 0.9 Sm 0.1 )O 2-δ . 
     
     
         18 . The method of  claim 14 , further comprising impregnating the first electrode precursor layer and the second electrode precursor layer with a catalyst or catalyst precursor material so as to form the cathode layer and the anode layer. 
     
     
         19 . The method of  claim 18 , wherein the catalyst or catalyst precursor for the electrode precursor layer which will form the cathode layer is selected from manganites, ferrites, cobaltites and nickelates, doped ceria, doped zirconia and mixtures thereof. 
     
     
         20 . The method of  claim 19 , wherein the catalyst or catalyst precursor for the electrode precursor layer which will form the anode layer is selected from Ni, Fe x Ni 1-x  alloys and a mixture of Ni and doped ceria/zirconia or a mixture of Cu and Cu and/or doped zirconia/ceria, and Ma s Ti 1-x Mb x O 3-δ  or LnCr 1-x M x O 3-δ ,
 wherein:
 Ma is Ba, Sr or Ca; 
 Mb is V, Nb, Ta, Mo, W, Th or U; 
 s ranges from 0 to 0.5; and 
 M is T, V, Mn, Nb, Mo, W, Th or U. 
 
 
     
     
         21 . The method of  claim 15 , further comprising the step of impregnating the electrode precursor layer which will form the cathode layer with a barrier material. 
     
     
         22 . The method of  claim 15 , further comprising the step of impregnating the first electrode precursor layer and second electrode precursor layer with a catalyst or catalyst precursor material so as to form the cathode layer and the anode layer. 
     
     
         23 . The method of  claim 16 , further comprising the step of impregnating the first electrode precursor layer and second electrode precursor layer with a catalyst or catalyst precursor material so as to form the cathode layer and the anode layer. 
     
     
         24 . The method of  claim 17 , further comprising the step of impregnating the first electrode precursor layer and second electrode precursor layer with a catalyst or catalyst precursor material so as to form the cathode layer and the anode layer. 
     
     
         25 . The method of  claim 14 , wherein the thickness of the anode layer and the cathode layer is 150 μm or less. 
     
     
         26 . The method of  claim 14 , wherein the electrolyte layer comprises more than one layer. 
     
     
         27 . The method of  claim 14 , wherein the anode layer and the cathode layer each comprise more than one layer. 
     
     
         28 . The method of  claim 14 , wherein the anode layer and the cathode layer have a porosity ranging from 20% to 80%. 
     
     
         29 . The method of  claim 14 , wherein the anode or the cathode layer, or both, is impregnated with a barrier material.