Journal
JOURNAL OF CATALYSIS
Volume 254, Issue 2, Pages 349-354Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2008.01.018
Keywords
oxygen reduction reaction; platinum; density functional calculations; chemical bonding; electrostatic interaction
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We established a chemical modification strategy to search for a substitute of platinum toward O-2 activation. Achieving this required an understanding of the chemical bonding interactions along the corresponding reaction pathway. Using recently developed chemical bonding analysis schemes, we found that the transition state of O-2 dissociation on Pt(111) is stabilized by electrostatic interactions and the bonding interaction between the two oxygen atoms. This paves the way for tuning the O-2 activation barrier by replacing a surface atom with a less electronegative transition metal atom. We considered substituted Pd(111), Ag(111), and Au(111) surfaces and suggest some potential candidates for further screening by experimentalists. (C) 2008 Elsevier Inc. All rights reserved.
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