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Structure of [C4mpyr][NTf2] Room-Temperature Ionic Liquid at Electrified Gold Interfaces



Yansen Lauw, Michael D. Horne, Theo Rodopoulos, Vera Lockett, Bulent Akgun, William A. Hamilton, Andrew R. J. Nelson


The structure of l-butyl=l-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([C4mpyr][NTf2]) room-temperature ionic liquid at an electrified gold interface was studied using neutron reflectometry, cyclic voltammetry, and differential capacitance measurements. Subtle differences were observed between the reflectivity data collected on a gold electrode at three different applied potentials. Detailed analysis of the fitted reflectivity data reveals an excess of [C4mpyr]+ at the interface, with the amount decreasing at increasingly positive potentials. A cation-rich interface was found even at a positively charged electrode, which indicates a non-electrostatic (specific) adsorption of [C4mpyr]+ onto the gold electrode.


Ionic liquid, neutron reflectivity, cyclic voltammetry, gold interface


Lauw, Y. , Horne, M. , Rodopoulos, T. , Lockett, V. , Akgun, B. , Hamilton, W. and Nelson, A. (2012), Structure of [C<sub>4</sub>mpyr][NTf<sub>2</sub>] Room-Temperature Ionic Liquid at Electrified Gold Interfaces, Langmuir, [online], (Accessed April 17, 2024)
Created April 18, 2012, Updated October 12, 2021