Microkinetic modeling of the oxygen reduction reaction at the Pt(111)/gas interface

D. Fantauzzie, T. Zhu, J.E. Müller, I.A.W. Filot, E.J.M. Hensen, T. Jacob

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)
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Abstract

A microkinetic model of the oxygen reduction reaction (ORR) on Pt(111) under a gaseous H 2 and O 2 atmosphere is used to predict and explain which compositions of H 2 and O 2 lead to the fastest rate of water formation for temperatures between 600 and 900 K. For a stoichiometric (2:1) mixture of H 2 and O 2 the rate-determing step is found to transition from O ¿ hydrogenation to O 2 ¿ dissociation over this same temperature range. These results are explained in terms of the temperature dependence of the surface coverages of O ¿ and H ¿ and are shown to be consistent with kinetic models aimed at understanding the ORR under electrochemical conditions.
Original languageEnglish
Pages (from-to)451-457
Number of pages7
JournalCatalysis Letters
Volume145
Issue number1
DOIs
Publication statusPublished - 2015

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