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Abstract
Methanol-tolerant cathodic catalysts were successfully prepared by depositing platinum nanoparticles on heat-treated FeTPP/C [FeTPP stands for 5,10,15,20-tetraphenyl-21H,23H porphine iron(III) chloride] and subsequently sintering the formed catalysts. Different sintering temperatures were investigated to determine its effect on methanol tolerance. Oxygen reduction with/without the presence of methanol on these new catalysts, Pt/C and FeTPP/C, was evaluated by means of potentiodynamic measurement in a rotating disk electrode system. Complete suppression of methanol oxidation while still maintaining high activity towards oxygen reduction was realized on the catalyst sintered at 700°C. Kinetics analysis shows that oxygen reduction on this new catalyst still follows a first-order reaction and has a similar mechanism as that on the pure Pt electrocatalyst. © 2004 The Electrochemical Society. All rights reserved.
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