The Journal of Physical Chemistry Letters · 2013 · 135 citations · 32 references
Natural SciencesChemistryMaterials ScienceElectrochemistrySurface ChemistrySurface ScienceElectrode KineticsElectrode-electrolyte InterfacesIon-conducting MaterialsIon-selective ElectrodesSurface PhysicsSurface SpectroscopyHysteretic BehaviorInfrared Absorption SpectroscopySelectivitySurface Charge MeasurementSurface Charge ModificationSurface Charge PropertiesSurface Potential MeasurementSurface-enhanced Infrared Absorption
Potential-dependent structure and dynamics of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([BMIM][TFSA]) on an Au electrode have been investigated by using surface-enhanced infrared absorption spectroscopy (SEIRAS). In situ, real-time IR measurements during potential scans enable us to probe a hysteretic exchange and reorientation of both the cation and anion at the interface simultaneously owing to the high interface selectivity and sensitivity of SEIRAS. Our experimental results reveal that during potential scans, the ion density in overlayers changes first, and then the exchange of the ions in the first ionic layer occurs to compensate the changes in surface charge.
32
Maciej Galiński, Andrzej Lewandowski, Izabela Stępniak · Electrochimica Acta · 2006 · 2.7K citations