Patent ID: 6645660
Filing Date: 2003-11-11
Classification: H01M,Y02E,Y02P

Abstract:
A screen-printing method of fabricating a gas diffusion electrode for a fuel cell, which comprises:providing a screen-printing paste having: at least one polymer, the at least one polymer being at least one binder selected from the group consisting of a poly(butyl acrylate)-polymethacrylate copolymer, a poly(vinyl alcohol), and a poly(ethylene oxide); at least one metallic catalyst; and a high-boiling solvent; forming a screen-printing layer having a thickness between 3 and 40 &mgr;m by applying the screen-printing paste to a base, the high-boiling solvent and the at least one polymer serving as a screen-printing medium for ensuring uniformity of the screen-printing layer; and baking the screen-printing layer to allow only residues of one of the high-boiling solvent and the at least one polymer to remain in the screen-printing layer, such residues not interfering with use of the gas diffusion electrode in a fuel cell.