Metallization of cyanide-modified Pt(111) electrodes with copper

Maria Escudero-Escribano, Christopher Wildi, Jonathan A. Mwanda, Angel Cuesta

Research output: Contribution to journalArticle

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Abstract

The reduction of Cu2+ ions irreversibly anchored on the surface of a cyanide-modified Pt(111) electrode via non-covalent or weakly covalent interactions with the N atom of adsorbed cyanide was studied using cyclic voltammetry (CV) and in-situ scanning tunneling microscopy (STM). Both CV and STM provide evidence that the reduction of irreversibly adsorbed Cu2+ to Cu in Cu2+-free sulfuric acid solutions does not result in the stripping of the cyanide adlayer. This strongly suggests that the reduction process results in the metallization of the cyanide adlayer on Pt(111), yielding a platinum-cyanide-copper sandwich configuration. STM also shows that the Cu deposit consists of isolated bidimensional nanoislands, which slowly grow through an Ostwald ripening mechanism if the potential is kept negative of the reduction peak. Metallization is not possible in perchloric acid solutions, which implies that the specific adsorption of sulfate on the bidimensional Cu nanoislands plays an important role in stabilizing them. This was confirmed by the observation on the nanoislands, using in-situ STM, of the structure typical for adsorbed sulfate on the (111) faces of fcc.
Original languageEnglish
Pages (from-to)1087-1094
Number of pages8
JournalJournal of Solid State Electrochemistry
Volume20
Issue number4
Early online date21 Jul 2015
DOIs
Publication statusPublished - Apr 2016

Fingerprint

Cyanides
cyanides
Metallizing
Copper
Scanning tunneling microscopy
scanning tunneling microscopy
copper
Electrodes
electrodes
Sulfates
Cyclic voltammetry
sulfates
Ostwald ripening
perchloric acid
sulfuric acid
Platinum
stripping
Sulfuric acid
platinum
Deposits

Keywords

  • platinum
  • copper
  • cyanide
  • SAMs
  • metallization
  • electroreduction
  • STM

Cite this

Metallization of cyanide-modified Pt(111) electrodes with copper. / Escudero-Escribano, Maria; Wildi, Christopher; Mwanda, Jonathan A.; Cuesta, Angel.

In: Journal of Solid State Electrochemistry, Vol. 20, No. 4, 04.2016, p. 1087-1094.

Research output: Contribution to journalArticle

Escudero-Escribano, Maria ; Wildi, Christopher ; Mwanda, Jonathan A. ; Cuesta, Angel. / Metallization of cyanide-modified Pt(111) electrodes with copper. In: Journal of Solid State Electrochemistry. 2016 ; Vol. 20, No. 4. pp. 1087-1094.
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abstract = "The reduction of Cu2+ ions irreversibly anchored on the surface of a cyanide-modified Pt(111) electrode via non-covalent or weakly covalent interactions with the N atom of adsorbed cyanide was studied using cyclic voltammetry (CV) and in-situ scanning tunneling microscopy (STM). Both CV and STM provide evidence that the reduction of irreversibly adsorbed Cu2+ to Cu in Cu2+-free sulfuric acid solutions does not result in the stripping of the cyanide adlayer. This strongly suggests that the reduction process results in the metallization of the cyanide adlayer on Pt(111), yielding a platinum-cyanide-copper sandwich configuration. STM also shows that the Cu deposit consists of isolated bidimensional nanoislands, which slowly grow through an Ostwald ripening mechanism if the potential is kept negative of the reduction peak. Metallization is not possible in perchloric acid solutions, which implies that the specific adsorption of sulfate on the bidimensional Cu nanoislands plays an important role in stabilizing them. This was confirmed by the observation on the nanoislands, using in-situ STM, of the structure typical for adsorbed sulfate on the (111) faces of fcc.",
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N2 - The reduction of Cu2+ ions irreversibly anchored on the surface of a cyanide-modified Pt(111) electrode via non-covalent or weakly covalent interactions with the N atom of adsorbed cyanide was studied using cyclic voltammetry (CV) and in-situ scanning tunneling microscopy (STM). Both CV and STM provide evidence that the reduction of irreversibly adsorbed Cu2+ to Cu in Cu2+-free sulfuric acid solutions does not result in the stripping of the cyanide adlayer. This strongly suggests that the reduction process results in the metallization of the cyanide adlayer on Pt(111), yielding a platinum-cyanide-copper sandwich configuration. STM also shows that the Cu deposit consists of isolated bidimensional nanoislands, which slowly grow through an Ostwald ripening mechanism if the potential is kept negative of the reduction peak. Metallization is not possible in perchloric acid solutions, which implies that the specific adsorption of sulfate on the bidimensional Cu nanoislands plays an important role in stabilizing them. This was confirmed by the observation on the nanoislands, using in-situ STM, of the structure typical for adsorbed sulfate on the (111) faces of fcc.

AB - The reduction of Cu2+ ions irreversibly anchored on the surface of a cyanide-modified Pt(111) electrode via non-covalent or weakly covalent interactions with the N atom of adsorbed cyanide was studied using cyclic voltammetry (CV) and in-situ scanning tunneling microscopy (STM). Both CV and STM provide evidence that the reduction of irreversibly adsorbed Cu2+ to Cu in Cu2+-free sulfuric acid solutions does not result in the stripping of the cyanide adlayer. This strongly suggests that the reduction process results in the metallization of the cyanide adlayer on Pt(111), yielding a platinum-cyanide-copper sandwich configuration. STM also shows that the Cu deposit consists of isolated bidimensional nanoislands, which slowly grow through an Ostwald ripening mechanism if the potential is kept negative of the reduction peak. Metallization is not possible in perchloric acid solutions, which implies that the specific adsorption of sulfate on the bidimensional Cu nanoislands plays an important role in stabilizing them. This was confirmed by the observation on the nanoislands, using in-situ STM, of the structure typical for adsorbed sulfate on the (111) faces of fcc.

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