Double layer structure and adsorption/desorption hysteresis of neat ionic liquid on Pt electrode surface — an in-situ IR-visible sum-frequency generation spectroscopic study

Ionic Liquid-Modified Electrocatalysts: The Interaction of [C 1 C 2 Im][OTf] with Pt(1 1 1) and its Influence on Methanol Oxidation Studied by Electrochemical IR Spectroscopy

“…Assuming a thin film The observation suggests that desorption of the [OTf] À is a fast process, whereas adsorption of [OTf] À shows a more complex kinetics: Upon switching to positive potential adsorption is very fast in the beginning, but becomes rather slow at large [OTf] À coverage. Slow interfacial ordering processes and hysteresis effects have previously been observed for pure ILs on single crystal electrodes and were associated to restructuring processes either in the IL layer or at the electrode surface [37,54]. Therefore, we tentatively assign the slow adsorption process to structure formation in the adsorbed [OTf] À layer at high coverage.…”

Liquid Nickel Salts: Synthesis, Crystal Structure Determination, and Electrochemical Synthesis of Nickel Nanoparticles

“…At negative potentials the cation of the ionic liquid adsorbs quite strongly to the surface, and at positive potentials the anion. Zhou et al [88] investigated the double layer behavior of [bmim][OTf] using SFG and found that the adsorptiono ft his ionic liquid to an electrode is also potential dependenta nd there is an adsorption hysteresis when switched from an egative to ap ositive potential and vice versa. This indicates that there is ac ertain binding energy and Madelung potentialt hat needs to be overcome when an adsorbed 1-butyl-3-methylimidazolium cation at negative potentials is interchanged with an adsorbed triflatea nion at positive potentials.…”

The Electrode/Ionic Liquid Interface: Electric Double Layer and Metal Electrodeposition

“…Similarly, potential-induced adsorption/desorption processes of anion/cation and scan-direction-dependent hysteresis effects were also observed by Ouchi and co-workers by SFG at the Pt/[BMI][CF 3 SO 3 ] interface. [86] Despite the necessity of using rough surfaces for enhancement, SERS has also been used to study the adsorption behavior of solvent ions on rough Ag in [BMI] [PF 6 ] by Rubim and coworkers. [80] It is shown that the BMI + cation adsorbs on the Ag surface with the imidazolium ring moving from nearly perpendicular to almost parallel to the surface as the electrode potential is made more negative.…”

“…Despite the difficulties in precise alignment of the two incident beams through the solution phase and the very expensive and sophisticated equipment, successful application of SFG spectroscopy in studies of the electrode/ionic liquid interface has been performed. [30,47,[83][84][85][86][87] …”