초록 ▼

Disclosed herein is an electrode substrate for fuel cells comprising two porous, carbonaceous layers, each having a number of elongated holes for feeding reactant gases into a fuel cell which are provided near the center of the thickness in said layer, and a gas impermeable, carbonaceous separator,

Disclosed herein is an electrode substrate for fuel cells comprising two porous, carbonaceous layers, each having a number of elongated holes for feeding reactant gases into a fuel cell which are provided near the center of the thickness in said layer, and a gas impermeable, carbonaceous separator, interposed between said layers and having a number of elongated holes for flowing coolant which are provided near the center of the thickness in the separator. The porous layer is either a uniformly porous, carbonaceous monolayer, or has a two-layer structure comprising a more porous layer, a less porous layer and elongated holes for feeding reactant gases provided between said more porous layer and said less porous layer, the less porous layer having a bulk density larger than that of the more porous layer. There are also provided according to the invention processes for preparing such an electrode substrate for fuel cells.

대표청구항 ▼

An electrode substrate for fuel cells comprising: (1) two porous carbonaceous layers, each having a number of elongated holes for feeding reactant gases into a fuel cell, which holes are defined near the center of the thickness thereof, and (2) a gas impermeable, carbonaceous separator interposed be

An electrode substrate for fuel cells comprising: (1) two porous carbonaceous layers, each having a number of elongated holes for feeding reactant gases into a fuel cell, which holes are defined near the center of the thickness thereof, and (2) a gas impermeable, carbonaceous separator interposed between said layers, having a number of elongated holes for flowing coolant, which holes are defined near the center of the thickness thereof; said two porous layers and said separator being integrated as a whole body by calcination, said separator excluding the elongated holes for flowing coolant having an average bulk density of about 1.2 g/cm3 or more, a gas permeability of about 1×10-4 cm2/hr.mmAq. or less, a thermal conductivity of about 1 kcal/m.hr.°C. or more and a specific resistance of about 10×10-3 W0.4 to 0.8 g/cm3, a porosity in the range of about 50 to 80%, a gas permeability of about 20 ml/cm.hr. mmAq. or more and a thermal conductivity of about 0.7 kcal/m.hr.°C. or more, about 60% or more of the open pores of said porous layer having a diameter of about 100 microns or less.