In this paper we report an SFG/DFG investigation of the adsorption of CN¯ –used as a probe molecule to study the electrochemical double-layer structure – at a polycrystalline Au electrode in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) amide ([BMP][TFSA]) room-temperature ionic liquid (RTIL). The adsorption of CN¯ yielded single SFG and DFG bands in the range from ca. 2125 to 2135 cm-1, exhibiting a Stark tuning of ca. 3 cm-1 V-1. Vibrational resonances – corresponding to modes of the RTIL coadsorbed with CN¯, were found in the range from ca. 1200 to 1500 cm-1. The study of the double-layer structure was complemented by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements, from which the differential double-layer capacity (CDL) was estimated.
An SFG/DFG investigation of CN¯ adsorption at an Au electrode in 1-butyl-1-methyl-pyrrolidinium bis (trifluoromethylsulfonyl) amide ([BMP][TFSA]) ionic liquid
BOZZINI, Benedetto;MELE, CLAUDIO;
2010-01-01
Abstract
In this paper we report an SFG/DFG investigation of the adsorption of CN¯ –used as a probe molecule to study the electrochemical double-layer structure – at a polycrystalline Au electrode in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) amide ([BMP][TFSA]) room-temperature ionic liquid (RTIL). The adsorption of CN¯ yielded single SFG and DFG bands in the range from ca. 2125 to 2135 cm-1, exhibiting a Stark tuning of ca. 3 cm-1 V-1. Vibrational resonances – corresponding to modes of the RTIL coadsorbed with CN¯, were found in the range from ca. 1200 to 1500 cm-1. The study of the double-layer structure was complemented by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements, from which the differential double-layer capacity (CDL) was estimated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
