Abstract
We studied the oxygen reduction reaction on a typical carbon supported Pt fuel cell catalyst in the presence of different anions. Similarly to smooth polycrystalline and single crystal Pt electrodes, the oxygen reduction reaction (orr) activity decreases in the order ClO 4 −>HSO 4 −>Cl −, consistent with the increasing adsorption bond strength of the anions. The orr properties of Pt/Vulcan in the presence of adsorbed Cl − can be interpreted as a superposition of the individual orr properties of the Pt(111)–Cl ad and Pt(100)–Cl ad solid ∣ liquid interface, both with respect to kinetic limitations and to the formation of H 2O 2. This is in qualitative agreement with the assumed cubo-octahedral Pt particle shape. Although these results were obtained in liquid electrolyte, similar reduced activity and enhanced formation of H 2O 2 can be expected in a PEMFC, therefore indicating the necessity of chloride free electrode preparation schemes in order to avoid performance losses and/or corrosion/degradation effects.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
