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

Published

Author(s)

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

Abstract

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.
Citation
Langmuir
Volume
28

Keywords

Ionic liquid, neutron reflectivity, cyclic voltammetry, gold interface

Citation

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], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910834 (Accessed April 17, 2024)
Created April 18, 2012, Updated October 12, 2021