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Russian Journal of Electrochemistry

, Volume 48, Issue 3, pp 259–270 | Cite as

An influence of pretreatment conditions on surface structure and reactivity of Pt(100) towards CO oxidation reaction

  • A. V. Rudnev
  • T. Wandlowski
Article

Abstract

We present a combined electrochemical and in situ STM study of the surface structure of Pt(100) single crystal electrodes in dependence on the cooling atmosphere after flame annealing. The following cooling conditions were applied: Ar/H2 and Ar/CO mixtures (reductive atmosphere), argon (inert gas) and air (oxidative atmosphere). Surface characterization by in-situ STM allows deriving direct correlations between surface structure and macroscopic electrochemical behavior of the respective platinum electrodes. We investigated the influence of defect type and density as well as long range surface order on the kinetics of the CO electro-oxidation reaction. The defect-rich Pt(100) electrodes as cooled in air or Ar, and followed by immersion in the hydrogen adsorption region display higher activities as compared to the rather smooth Pt(100)-(1 × 1) electrode cooled in an Ar/H2-atmosphere.

Keywords

single crystal platinum cyclic voltammetry scanning tunneling microscopy Pt(100) carbon monoxide 

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© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  1. 1.Frumkin Institute of Physical Chemistry and ElectrochemistryRussian Academy of SciencesMoscowRussia
  2. 2.Department of Chemistry and BiochemistryUniversity of BernBernSwitzerland

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