Reduction of Ag+ irreversibly adsorbed on cyanide-modified Pt(111)

Jonathan A Mwanda, Angel Cuesta Ciscar* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We report a study of the electrochemical reduction of Ag+ immobilised on a cyanide modified Pt(111) electrode in a Ag+-free solution using cyclic voltammetry and in-situ STM. We show that, upon reduction at 0.29 V, Ag deposits directly on the platinum substrate, resulting in the formation of an AgPt surface alloy without loss of the cyanide adlayer The large affinity of Ag+ for CNad is responsible for this large negative shift of the Ag+/Ag redox couple.. A fraction of the electrodeposited Ag is reoxidised at 0.34 V to yield again Ag+ coordinated to the CN adlayer. Therefore, successive cycling with a positive limit below 0.90 V results in a roughening of the surface and in the gradual transformation of cyanide-modified Pt(111) to a cyanide-modified AgPt surface alloy on Pt(111).
Original languageEnglish
Article number115039
JournalJournal of Electroanalytical Chemistry
Early online date23 Jan 2021
DOIs
Publication statusE-pub ahead of print - 23 Jan 2021

Keywords

  • Cyclic voltammetry
  • STM
  • electroreduction
  • Metallization
  • cyanide-modified Pt(111)
  • Surface alloy

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