TY - SER AU - Lopes, Thiago AU - Chlistunoff, Jerzy AU - Garzon, Fernando H. TI - Oxygen Reduction Reaction on a Pt/Carbon Fuel Celi Catalyst InPresence of Trace Quantities of Ammonium Ions: an Rrde Study KW - Orr Kinetics KW - Ammonia KW - Contaminant ER -