Cyanide-modified Pt(111): structure, stability and hydrogen adsorption

Maria Escudero-Escribano, German J. Soldano, Paola Quaino, Martin E. Zoloff Michoff, Ezequiel P. M. Leiva, Wolfgang Schmickler, Angel Cuesta

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Abstract

Cyanide-modified Pt(1 1 1) surfaces have been recently used to study atomic-ensemble effects in electrocatalysis. These studies have been based on the assumption that cyanide acts as a third body, blocking some surface sites but leaving the electronic properties of the surrounding ones unaltered, although this is in apparent contradiction with the observation of a positive shift of 0.2 V in the onset of hydrogen adsorption on cyanide-modified Pt(1 1 1) electrodes, as compared with clean Pt(1 1 1). We have performed theoretical calculations in order to provide support to this assumption and explain the positive shift in the onset of hydrogen adsorption, which is shown to be due to the formation of CNHad.
Original languageEnglish
Pages (from-to)524-533
Number of pages10
JournalElectrochimica Acta
Volume82
Early online date28 Feb 2012
DOIs
Publication statusPublished - 1 Nov 2012

Keywords

  • cyanide-modified Pt(1 1 1)
  • DFT
  • hydrogen adsorption

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    Escudero-Escribano, M., Soldano, G. J., Quaino, P., Zoloff Michoff, M. E., Leiva, E. P. M., Schmickler, W., & Cuesta, A. (2012). Cyanide-modified Pt(111): structure, stability and hydrogen adsorption. Electrochimica Acta, 82, 524-533. https://doi.org/10.1016/j.electacta.2012.02.062