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Nanoscale Visualization and Multiscale Electrochemical Analysis of Conductive Polymer Electrodes for Energy Conversion and Biosensing

Research profile seminar

Abstract: Conductive polymer electrodes have exceptional promise as active elements in next-generation photon-to-electron-to-molecule processes associated with energy harvesting and storage. Notable advantages include the ease of tuning the chemical, optical and electronic properties through synthesis and the low-cost afforded through printing approaches. A number of electrochemical devices and architectures have been developed, including thermogalvanics, electrochromics, supercapacitors, redox-flow batteries, and photo-electrochemical devices. Additional applications include biosensors, where recent advancements in emergent wearable health-monitoring devices has inspired the inclusion of conductive polymer as sensing elements on fabrics and textiles, on the skin as electronic tattoos, and in vivo. Understanding the underlying structure-function properties is critical to new technological development.

Despite well-established structural heterogeneity in these systems, conventional macroscopic electroanalytical methods, specifically cyclic voltammetry, are typically used as the primary tool for structure-property elucidation. This work presents an alternative correlative multi-microscopy strategy; data from laboratory and synchrotron-based micro-spectroscopies, including conducting-atomic force microscopy and synchrotron nanoscale infrared spectroscopy, is combined with potentiodynamic movies of electrochemical fluxes from scanning electrochemical cell microscopy, SECCM, to reveal the relationship between electrode structure and activity. The nanoscale electrochemical data are used to model and predict multiscale electrochemical behavior, revealing that macroscopic cyclic voltammograms should be much more kinetically facile than observed experimentally. This work serves as a roadmap for benchmarking the quality of conductive polymer films as electrodes, emphasizing the importance of nanoscale electrochemical measurements in understanding macroscopic properties.

Lecturer: Erin Ratcliff (University of Arizona, Tucson, AZ U.S.A.) https://mse.engineering.arizona.edu/faculty-staff/faculty/erin-ratcliff

Date: 3/26/2020

Time: 12:00 PM - 1:00 PM

Categories: Science

Location: Campus Johanneberg, Chemistry building, room KC

Contact person: Christian Müller

Page Manager: |Last update: 1/2/2012

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