| 摘要 |
PURPOSE: To improve hydrogen concentration distribution and current density distribution by providing a plurality of sections which are different in gas permeability of an electrode base material for one of a pair of electrodes from each other. CONSTITUTION: A fuel electrode side electrode base material 6A is divided into four sections parallelly in each of the inflow direction of reaction air and that of fuel gas, and these sections are named a A section, a B section, a C section, and a D section in order of higher hydrogen concentration in the fuel gas, while reversely, hydrogen gas permeability in each of the sections is increased from the A section to the D section. That is, in the A section, gas permeability of a molding die, from which a molding material with the minimum pitch filling factor and the minimum size in carbon short fiber is previously released, is minimized, while in the D section, that is maximized, and in each of the B section and the C section, intermediate gas permeability is provided. These plural kinds molding materials are integrally pressed and burnt, so that the base material 6A consisting of four sections, which are gradually different in hydrogen gas permeability, is produced. In this way, equal current density line is linearized in the flowing direction of the fuel gas, so that a difference of current density is hardly observed in this direction. |
