Method of manufacturing electrodes for fuel cells

摘要

Sintered electrodes for fuel cells are produced by sintering in a reducing atmosphere above 450 DEG C. for more than 5 minutes a powder mixture comprising a metal powder with a particle size of 5-40 microns selected from Ni, Ag or Cu and Fe coated with Ni or Ag and not more than 20% by weight in relation to the metal of carbon powder with a particle size less than 200 microns. The Ni powder is preferably 5-6 microns, the Ag powder 20-40 microns and the carbon powder 30-50 microns the Ni powder mixture being sintered at 880 DEG C-1100 DEG C. in hydrogen and the Ag powder mixture at 520 DEG C-650 DEG C. in hydrogen. The mixture may be sintered without compaction but if a binder such as a 10% solution of carboxymethyl-cellulose is added the mixture is compacted at a pressure below 3 tons/sq. cm. before sintering.