New insight on the behavior of the irreversible adsorption and underpotential deposition of thallium on platinum (111) and vicinal surfaces in acid electrolytes

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External organisations

  • Instituto de Electroquímica
  • Universidad de Alicante
  • University of Southampton


We report, for the first time, the electrochemical behavior of thallium irreversibly adsorbed on Pt (111) and platinum stepped surfaces composed of (111) terraces and monoatomic steps. Similar to the case of thallium UPD, the voltammograms obtained after thallium irreversible adsorption present three characteristic features. After a careful analysis of the effect of the thallium concentration, the concentration and nature of the anion of the supporting electrolyte and the pH of the solution on these voltammetric features, we have been able to ascribe these processes to Tl/Tl+ oxidation and anion adsorption on the Tl-modified surface. In addition, the results obtained with stepped surfaces, indicate that some of the features are clearly associated to the presence of (111) surface domains, and thus they could be used for the quantification of these sites.


Original languageEnglish
Pages (from-to)319-325
Number of pages7
JournalElectrochimica Acta
Early online date7 Nov 2014
Publication statusPublished - 1 Jan 2015


  • Thallium, Irreversible adsorption, Underpotential deposition, Single crystal, Anions