| 摘要 |
PURPOSE:To provide an electrode catalyzer layer for fuel cell with enhanced polarization characteristic and excellent long-term reliability by classifying catalyzer particles, and forming a film with these classified particles laid in the sequence of the magnitude. CONSTITUTION:An electrode catalyzer layer 11 is bonded fast onto an electrode base material. This layer 11 consists of greater size catalyzer particles 1A, fluorine resin particles 2A, smaller size catalyzer particles 1B and fluorine resin particles 2B, wherein the particle size gradient shall consist of greater sizes on the base material side 10 and smaller sizes on the oppositely situated electrolyte layer side. This layer 11 is prepared by separating and selecting approx. the same carbon particles at every interval of particle size by centrifugal separation method through utilization of the fact that the precipitation speed of carbon particles differes according to the particle size when the carbon particles are dispersed in solvent. This enlarges the supply diffusion of reaction gas on the base board 10 side to improve the electrolyte retainability on the electrolyte layer side, which increases the amount of three-phase interface. |
