On the behavior of the Pt(1 0 0) and vicinal surfaces in alkaline media

Rosa M. Arán-Ais, Marta C. Figueiredo, Francisco J. Vidal-Iglesias, Víctor Climent, Enrique Herrero (Corresponding author), Juan M. Feliu

Research output: Contribution to journalArticleAcademicpeer-review

47 Citations (Scopus)


We address in this paper a voltammetric study of the charge transfer processes characteristic of Pt(1 0 0) and vicinal surfaces in alkaline media. The electrochemical behavior of a series of stepped surfaces of the type Pt(S)[n(1 0 0) × (1 1 1)] has been characterized using cyclic voltammetry at different pHs, charge displacement measurements and FTIR experiments for adsorbed CO. The results from these techniques allow assigning the different peaks appearing in the voltammogram to hydrogen and/or OH adsorption on the different sites of these surfaces, namely, terrace and step sites. Additionally, the potential of zero total charge (pztc) of the electrodes was determined. The resulting pztc values shift to more negative values when the step density increases on the surface up to n = 5. FTIR spectroscopy experiments have been used to monitor the adsorption of CO on the different surfaces as well as the consequent CO oxidation, accompanying a positive potential sweep. The oxidation of adsorbed CO on (1 0 0) terraces is catalyzed by the presence of the (1 1 1) steps. The FTIR spectra revealed that CO is mostly bonded in bridge configuration at low potentials interconverting to on-top when the electrode potential is increased.

Original languageEnglish
Pages (from-to)184-192
Number of pages9
JournalElectrochimica Acta
Issue number1
Publication statusPublished - 30 Dec 2011
Externally publishedYes


  • CO charge displacement
  • CO oxidation
  • NaOH
  • Pt(1 0 0) stepped surfaces
  • pztc


Dive into the research topics of 'On the behavior of the Pt(1 0 0) and vicinal surfaces in alkaline media'. Together they form a unique fingerprint.

Cite this