title: Kinetically induced irreversibility in electro-oxidation and reduction of Pt surface.
abstract: A mean field kinetic model was developed for electrochemical oxidations and reductions of Pt(111) on the basis of density functional theory calculations, and the reaction mechanisms were analyzed. The model reasonably describes asymmetric shapes of cyclic voltammograms and small Tafel slopes of relevant redox reactions observed in experiments without assuming any unphysical forms of rate equations. Simulations using the model indicate that the oxidation of Pt(111) proceeds via an electrochemical oxidation from Pt to PtOH and a disproportionation reaction from PtOH to PtO and Pt, while its reduction proceeds via two electrochemical reductions from PtO to PtOH and from PtOH to Pt.
authors.affiliation: Toyota Central R&D Labs., Inc. 41-1 Yokomichi Nagakute, Aichi 480-1192, Japan.
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Jinnouchi
authors.affiliation: Toyota Central R&D Labs., Inc. 41-1 Yokomichi Nagakute, Aichi 480-1192, Japan.
authors.forename: Kensaku
authors.initials: K
authors.lastname: Kodama
authors.affiliation: Toyota Central R&D Labs., Inc. 41-1 Yokomichi Nagakute, Aichi 480-1192, Japan.
authors.forename: Takahisa
authors.initials: T
authors.lastname: Suzuki
authors.affiliation: Toyota Central R&D Labs., Inc. 41-1 Yokomichi Nagakute, Aichi 480-1192, Japan.
authors.forename: Yu
authors.initials: Y
authors.lastname: Morimoto