| abstract |
A solid oxide fuel cell is disclosed. An electrolyte layer made of an oxide ion conductor material, given by La¶1-a¶A¶a¶Ga¶1- (b + c) ¶B¶b¶Co¶c¶O¶3¶, and an air electrode layer made of an electron conductor Material, specified by La¶1-d¶A¶d¶CoO¶3¶, has been coated, preferably an intermediate layer made of a mixed electron and ion conductor material, specified by La¶1-e¶A¶e, was between the two ¶Ga¶1- (f + g) ¶B¶f¶Co¶g¶O¶3¶, stored. The layer structure is sintered to join the layers and then subjected to heat treatment to achieve the diffusion of the elements through the phase interface between the adjacent layers. As a result, the composition in each of the phase interfaces changes continuously. Here A is at least one element selected from the group consisting of Sr and Ca; B is an element selected from the group consisting of Mg, Al and In, and 0.05 a 0.3; 0 b; 0 c 0.15; b + c 0.3; 0 d 0.5; 0 f 0.15; 0.15 g 0.3 and f + g 0.3. As a result, the cell is free from cracks, deformations, delaminations, an increase in phase interface resistance under thermal stress during the sintering process and during operation. An increase in the reaction area at the air electrode leads to improved cell effectiveness. |