Sum Frequency Generation Spectroscopy and Electrochemical Analysis of the 1-Butyl-3-methylimidazolium Bis{(trifluoromethyl)sulfonyl}amide Double Layer Structure on the Platinum Electrode

Rivera-Rubero, Selimar; Baldelli, Steven

doi:10.1021/bk-2009-1030.ch020

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed SFG spectra of the cations arise from methyl and methylene CH stretch modes rather than from the imidazolium rings most probably because the rings are situated parallel to the graphene surface which is consistent with the MD simulations. 34,35,46,53,54 Figure 8 shows the distributions of the methyl and methylene groups at various surface charge densities. Even when the imidazolium ring is expelled from the surface at a high surface charge, there are still methylene and methyl groups in contact with the surface.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Molecular Response of 1-Butyl-3-Methylimidazolium Dicyanamide Ionic Liquid at the Graphene Electrode Interface Investigated by Sum Frequency Generation Spectroscopy and Molecular Dynamics Simulations

Xing

Pei

et al. 2015

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

The ion distribution at the charged three layer graphene–ionic liquid (1-butyl-3-methylimidazolium dicyanamide, [BMIM][DCA]) interface is probed by sum frequency generation spectroscopy (SFG), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The SFG results show the presence of both [BMIM]+ cations and [DCA]− anions at the charged graphene surface, where the anion signal increased with the increasing external potential and the cation signal was little influenced by the external potential. The CV and EIS results suggest that ions form an electrically stable double layer at the charged graphene surface. Molecular dynamics simulations of [BMIM][DCA] near the charged graphene surface suggest that the interface consists of alternating layers of cations and anions that restructure with external potential variation. The experimental data can be interpreted by a double-layer model where the anionic and cationic layers interchange position with each other at the surface depending on the applied potential.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%