MEMBRANE-ELECTRODE ASSEMBLY FOR POLYMERIC MEMBRANE FUEL CELLS

摘要

The invention is relative to a membrane-electrode assembly for fuel cell s, comprising a state of the art ion-exchange polymeric membrane and by state o f the art gas diffusion electrodes, whose electrochemical properties are modified through the addition of a hydrophilic component localised in correspondence of one or both the electrodic interfaces and/or one or both the external surfac es of the membrane. The such modified membrane-electrode assembly is characterised by high protonic conductivity and high efficiency even in the presence of small quantities of carbon monoxide, or of other contaminants contained in the fuel, even at temperatures as low as 100.degree.C, being al so suitable for medium temperature (100-160.degree.C) operation at relative humidity level lower than saturation.