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BRIEF) Many of the types of porous gas electrodes used in fuel cells have a · . double porosity structure: a system of gas filled macropores superimposed on one of liquid filled micropores• A model for the operation of such an _ electrode is formulated by considering the mac·ro and micropore systems as parallel one dimensional ~ontinua, appropriately joined by a series of " " . linking pores which represent the micropore structure immediately surrounding each macropore. Transport of dissolved gas reactant, ionic species, and current to/from reaction sites in the linking and micropores is analyzed, together with,local electrode kinetic relationships, to characterize the reaction distribution and exterior behavior for the electrode. The calculated behavior for an oxygen cathode operating in 6.9 _N KOH illustrates the high activity and almost linear overpotential/current relationship predicted by this model. There a.re significant differences in electrode behavior from that predicted by available treatments based ·on a single pore or uniform pore structure.

Analysis of Operation of Porous Gas Electrodes with Two Superimposed Scales of Pore Structure