SEPARATOR FOR FUEL CELL, PROCESS FOR PRODUCING THE SAME, AND FUEL CELL

摘要

A separator for fuel cells which comprises a resin and a conductive material as constituent components and has gas channels, at least part of the surface of the gas channels having sulfo groups imparted thereto by a treatment with sulfuric acid gas. It is characterized in that the resin present in the surface of the gas channels of the separator has been bonded to the sulfo groups and that the proportion of the sulfur atoms of the sulfo groups present on the surface of the gas channels as determined by energy dispersive X-ray spectroscopy is 0.1-4.0 at.%. The separator for fuel cells has excellent wettability by water due to the impartation of sulfo groups to the resin present in the surface of the gas channels of the separator by a treatment with a sulfuric acid-containing gas.