Journal
ELECTROCHIMICA ACTA
Volume 133, Issue -, Pages 132-145Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.04.034
Keywords
(CO oxidation; Pt single crystal; in situ STM; SHINERS)
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Funding
- European Union by the Swiss National Science Foundation [200021-124643]
- University of Bern
- MC fellowship within the project ELCAMI
- EraNet.Rus program (ECCON project)
- KTI project [DEAFM 13696.1]
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We present an experimental study of the CO electro-oxidation on Pt(100)-(1 x 1) electrodes employing electrochemical methods in combination with in situ scanning tunneling microscopy (STM) and shell-isolated nanoparticle enhanced Raman spectroscopy (SHINERS). We discussed the nature and stability of the active sites in the preignition region in the presence of dissolved CO (COb) and monitored substrate structure changes during the COb electro-oxidation process. We corroborated that the electro-oxidation kinetics is determined decisively by the history of CO adlayer formation. A new mechanism was proposed for Pt(100) electrode deactivation in the preignition region after excursion of electrode potential to COb ignition region. We believe that this mechanism takes place on Pt surfaces independently on their crystallographic orientation. (C) 2014 Elsevier Ltd. All rights reserved.
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