Direct observation of complexation of alkali cations on cyanide-modified Pt(111) by scanning tunneling microscopy

Youn Geun Kim, Shueh Lin Yau, Kingo Itaya

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Abstract

In situ scanning tunneling microscopy was employed to examine the interfacial structure of a well-defined Pt(111) electrode in both acidic and alkaline solutions containing NaCN or KCN. A well-ordered (2√3×2√3)R30° CN-adlayer structure was observed at potentials in the double layer charging region. The adlayer consists of 6-membered-ring unit cells with cations coordinated in the center of the hexagon. The corrugation height of the center spot was found to be dependent on imaging conditions, becoming invisible under certain conditions, suggesting the absence of cyanide coordinated in the hexagonal ring. Bright spots were clearly observed in the center of the hexagonal ring when K+ cations were introduced into the solution. These potential-dependent bright spots were attributed to strongly coordinated K+ in the hexagonal ring of the adsorbed CN on Pt(111).

Original languageEnglish
Pages (from-to)393-400
Number of pages8
JournalJournal of the American Chemical Society
Volume118
Issue number2
DOIs
StatePublished - 17 Jan 1996

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