Journal Title
Title of Journal: Electrocatalysis
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Abbravation: Electrocatalysis
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Authors: Steven G Rinaldo Wendy Lee Jürgen Stumper Michael Eikerling
Publish Date: 2014/03/07
Volume: 5, Issue: 3, Pages: 262-272
Abstract
In polymer electrolyte fuel cells the platinum catalyst in its active form is found predominantly in an oxidized state Formation and reduction of surface oxide species determine both the electrocatalytic activity of the oxygen reduction reaction as well as the rate of corrosive Pt dissolution Understanding of mechanisms and rates of oxide formation and reduction is therefore essential in view of both performance and durability Pt111 is the generic model system for fundamental studies in fuel cell electrochemistry and cyclic voltammetry at Pt111 gives an unabated view of the oxide formation and reduction processes The unresolved challenge is to develop an electrochemical kinetic model that allows the current response measured in cyclic voltammetry to be deconvoluted and interpreted in relation to independent spectroscopic imaging and theoretical data Accordingly a kinetic model for Pt111 oxide formation and reduction within the voltage range of 065–115 V is developed and evaluated against electrochemical spectroscopic and computational studies Considering the complexity of surface processes involved and the simplicity of the proposed model the agreement with the extensive range of data is convincing The model provides a comprehensive picture of surface electrochemical processes that occur at Pt111 in the normal operational voltage range of the cathode catalyst for polymer electrolyte fuel cells in automotive applicationsWe gratefully acknowledge the financial support of this work by the Natural Sciences and Engineering Research Council of Canada Collaborative Research and Development Grants program as well as by the collaborating company AFCC We would like to thank Jingwei Hu AFCC Andreas Putz AFCC Chris Richards AFCC and Heather Baroody SFU for insightful discussions and the reviewers for bringing some critical references to our attention
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