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DTSTART:20070311T020000
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DTSTAMP:20261009T104649
DTSTART;TZID=America/Detroit:20261022T160000
DTEND;TZID=America/Detroit:20261022T171500
SUMMARY:Workshop / Seminar:Imaging Beyond the Electrode to Bridge Molecular and Macroscopic Scales using 2D IR Microscopy
DESCRIPTION:Electrochemical cells rely on redox reactions at electrode–electrolyte interfaces\, where electrode composition strongly influences reaction pathways and stability. Copper is widely used as a current collector\, yet its interfacial redox dynamics in ionic liquid electrolytes remain poorly understood on ultrafast timescales. Traditional electrochemical techniques provide macroscopic insight but lack the temporal resolution to capture these dynamics. Here\, we combine two-dimensional infrared (2D IR) imaging with theory to bridge molecular-scale dynamics and macroscopic electrochemical measurements.Using time-dependent 2D IR imaging\, we probe ultrafast vibrational dynamics and chemical equilibria in an ionic liquid containing dicyanamide (DCA⁻). Although copper(I) is typically unstable in solution\, DCA⁻ stabilizes this oxidation state\, enabling the formation of both copper(I) and copper(II) DCA complexes under applied potential. Cross-peak analysis reveals dynamic equilibrium and migration of these species near the oxidizing electrode\, permitting direct observation of reaction pathways during device operation. These results provide molecular-level insight into copper redox chemistry in ionic liquid electrolytes and demonstrate the capability of 2D IR imaging for studying operating electrochemical systems. Finally\, we present a promising approach based on a spectral generalized master equation framework that dramatically reduces image acquisition time.
UID:151931-21912477@events.umich.edu
URL:https://events.umich.edu/event/151931
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Chemistry,Physical Chemistry
LOCATION:Chemistry Dow Lab - CHEM 1640
CONTACT:
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