(42i) Electrochemical Cell Designed for in Situ Examination of Surfactant Ionic Liquid Interface Structure
AIChE Annual Meeting
Sunday, October 28, 2018 - 5:30pm to 5:45pm
Herein the benefits of using the in situ electrochemical cell for spectroscopic methods and its impact on understanding the interfacial layer of ILs is presented. The electrochemical cell was designed with the intent of making in situ surface enhanced Raman spectroscopy (SERS) measurements. Primary benefits of the designed cell include the capability of minimizing IL contamination from contact with air and improperly cleaned electrodes, and the ability to purge desired gasses through the cell. Electrochemical SERS measurements were performed with first activating the electrode surface for SERS via electrodeposition-dissolution cycling of metals (e.g., silver). Potentials were chosen for the specific ILs from along the differential capacitance curve in an attempt to add quantitative arguments to the expected formation and collapse of interface structure. Differential capacitance of the ILs was measured by electrochemical impedance spectroscopy (EIS) and verify that formation and collapse of distinct interfacial structure occurs within the chosen ILs. Overlapping the SERS measurements to specific differential capacitance points has helped build the understanding of IL interactions with charged surfaces by providing a quantitative description of interfacial rearrangements.