Flow field structures for membrane electrode assemblies of fuel cells

摘要

An electrochemical fuel cell having a membrane electrode assembly (1) and a flow field (4) adjacent thereto wherein the flow field comprises an electrically conductive porous material having a porosity of at least 50 percent and a mean pore size of at least 35 microns. This fuel cell is able to operate at relatively high current densities and relatively high voltages at reduced gas flow rates.