Voltammetric and spectroscopic characterization of cyanide adlayers on Pt(h,k,l) in an acidic medium

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Title: Voltammetric and spectroscopic characterization of cyanide adlayers on Pt(h,k,l) in an acidic medium
Authors: Huerta Arráez, Francisco | Morallon, Emilia | Vázquez Picó, José Luis | Aldaz Riera, Antonio
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física
Keywords: Cyanide | Electrochemical methods | Infrared absorption spectroscopy | Low index single crystal surfaces | Metal-electrolyte interfaces | Platinum
Knowledge Area: Química Física
Date Created: 18-Aug-1998
Issue Date: 20-Jan-1998
Publisher: Elsevier
Citation: HUERTA ARRÁEZ, Francisco, et al. "Voltammetric and spectroscopic characterization of cyanide adlayers on Pt(h,k,l) in an acidic medium". Surface Science. Vol. 396, Issues 1-3 (20 Jan. 1998). ISSN 0039-6028, pp. 400-410
Abstract: Irreversibly adsorbed cyanide adlayers formed on single-crystal platinum electrodes were studied by cyclic voltammetry and in-situ FTIR spectroscopy in a perchloric medium. A vibrational band around 2100 cm−1 was assigned to the C-N stretching vibration of adsorbed cyanide on the three electrode surfaces. Cyanide adlayers seem to be stable on Pt(111) in a wide range of potentials. Tuning rates of 100 and 30 cm−1 V−1 were measured for the band at 2100 cm−1 below and above 0.5 V, respectively. Adsorbed cyanide has a complex behavior on Pt(100). The polarization of the cyanide-covered Pt(100) electrode in the potential region below 0.4 V (RHE) leads to the formation of a CO adlayer (band at 1820 cm−1). The oxidation of adsorbed cyanide on the Pt(100) electrode produces CO2 (band at 2344 cm−1) and adsorbed NO (band at 1624 cm−1), which shows a characteristic voltammetric behavior. Adsorbed cyanate (band at 2175 cm−1) was also identified as an intermediate product during adsorbed cyanide oxidation on Pt(100). Finally, for Pt(110), adsorbed cyanide is slowly desorbed below 0.1 V (RHE).
Sponsor: Generalitat Valenciana; DGCYT (PB93/0944)
URI: http://hdl.handle.net/10045/7815
ISSN: 0039-6028
DOI: 10.1016/S0039-6028(97)00694-8
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/S0039-6028(97)00694-8
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