Reduction of CO Content in Hydrogen Rich Fuel by CO Electrolytic Oxidation for Reformed Gas Fueled PEFCs

Abstract

The possibility of the electrolytic oxidation of CO as a means of reducing the CO content in refomaed gas for PEFCs was investigatedA two-cell stack of PEFCs was used as a CO electrolysis moduleTo study the CO adsorption rate and CO selectivity of the mo(1ulethree types of electrolyzing metho(lsconstant current electrolysispotential steppe(l electrolysisand repeating pulse electrolysiswere usedIt was found that the CO concentration can be reduced fom lto below the50ppm level when a voltage exceeling more thm O4V is applied to each cell of the moduleThe madmum selectivity of the CO electrolytic oxidation was observed to reach18using the repeating pulse electrolysis method in a low current regionHoweverin a high current regionthe selectivity of the CO oxidation did not improve