Festoxidbrennstoffzellen

摘要

A solid oxide fuel cell has a solid electrolyte portion (3A) formed by a spraying method as an ion conductor, a thickness of said solid electrolyte portion is not less than 40 mu m and not more than 100 mu m, and a leakage amount of N2 gas of said solid electrolyte portion at a room temperature is not more than 10<-><5> cc/g.second. A permeation coefficient of said solid electrolyte portion is preferably not more than 10<-><7>cm<4>/g.second at a room temperature. A solid oxide fuel cell has a solid electrolyte portion (3A) as an ion conductor. One or more metal element selected from a group consisting of manganese, iron, cobalt, nickel, copper and zinc is contained in said solid electrolyte portion in an average amount of not less than 1 atom% and not more than 15 atom% based on a sum of amounts of all metal elements contained in said solid electrolyte portion. A powdery raw material for a solid electrolyte having an average particle diameter of 10-40 mu m is mixed with a compound of one or more metal element selected from a group consisting of manganese, iron, cobalt, nickel, copper and zinc to obtain a mixed powder. An amount of said metal element is not less than 1 atom% and not more than 15 atom% based on a sum of amounts of all metal elements contained in the mixed powder. A sprayed film is formed by a spraying method using the mixed powder. The sprayed film is then subjected to a heat treatment at a temperature of 1350 DEG C - 1500 DEG C to form an air-tight solid electrolyte film. Or, a powdery additive of a compound of said one or more metal element and the powdery raw material are supplied into a spray gun portion by means of separate apparatuses for supplying powders , respectively. An amount of said metal element is not less than 1 atom% and not more than 15 atom% based on a sum of amounts of all metal elements contained in the powdery raw material and the powdery additive. The powdery raw material and the powdery additive are molten in the spray gun portion. Or, a powdery raw material for a solid electrolyte and a compound of said one or more metal element are mixed to obtain a mixed powder. An amount of the metal element is not less than 1 atom% and not more than 15 atom% based on a sum of amounts of all metal elements contained in the mixed powder. The mixed powder are formed into a granulated powder having an average particle diameter of 10-40 mu m. A sprayed film is formed by a spraying method using the granulated powder.