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International Journal of Electrochemistry
Volume 2011, Article ID 289032, 9 pages
http://dx.doi.org/10.4061/2011/289032
Research Article

The Electrochemical Development of Pt(111) Stepped Surfaces and Its Influence on Methanol Electrooxidation

1Núcleo Ingeniería Electroquímica, Facultad de Ingeniería, Instituto de Ingeniería Química-Laboratorio de Electroquímica Fundamental, Facultad de Ciencias, Instituto de Química Biológica, Rodó 1843, Udelar, Montevideo 11400, Uruguay
2Laboratorio de cristalografía, estado sólido y materiales (Cryssmat-Lab), DETEMA, Centro NanoMat, Polo Tecnológico de Pando, Facultad de Química, Gral. Flores 2224, Udelar, Montevideo 11000, Uruguay

Received 1 April 2011; Accepted 6 May 2011

Academic Editor: Maria E. Martins

Copyright © 2011 E. Teliz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The progress in the preparation of new electrode surfaces by electrochemical treatments exhibiting high faradaic efficiencies towards industrial electrocatalytic processes has gained more attention in today's scientific community. Most of the papers report new catalysts dispersed on different substrates, but some fundamental studies required for electrochemical and physical characterizations are sometimes forgotten. In this paper, we make a full staging of two electrochemical treatments that can be conducted to enhance the electrocatalytic activity of platinum surfaces, such as, electrofacetting through square wave potential programs and constant cathodic polarizations in the net hydrogen evolution region. The cathodic treatment applied at −2 V clearly develops (111) stepped planes similarly to the electrofacetting performed after applying the square wave program between 1.40 V and 0.70 V at 2.5 kHz. The X-ray diffraction patterns of both surfaces as well as on other electrofacetted platinum electrodes are obtained for comparison purposes. Moreover, the electrocatalytic activity towards methanol electrooxidation also exhibits equivalent coulombic efficiencies and 200% higher than on polycrystalline platinum as demonstrated by linear sweep voltammetry and potentiostatic current decays.