Optical Fluorescence Microscopy for Spatially Characterizing Electron Transfer across a Solid-Liquid Interface on Heterogeneous Electrodes

MRS Advances
Eric ChoudharyVeronika A Szalai

Abstract

Heterogeneous catalytic materials and electrodes are used for (electro)chemical transformations, including those important for energy storage and utilization.1, 2 Due to the heterogeneous nature of these materials, activity measurements with sufficient spatial resolution are needed to obtain structure/activity correlations across the different surface features (exposed facets, step edges, lattice defects, grain boundaries, etc.). These measurements will help lead to an understanding of the underlying reaction mechanisms and enable engineering of more active materials. Because (electro)catalytic surfaces restructure with changing environments,1 it is important to perform measurements in operando. Sub-diffraction fluorescence microscopy is well suited for these requirements because it can operate in solution with resolution down to a few nm. We have applied sub-diffraction fluorescence microscopy to a thin cell containing an electrocatalyst and a solution containing the redox sensitive dye p-aminophenyl fluorescein to characterize reaction at the solid-liquid interface. Our chosen dye switches between a nonfluorescent reduced state and a one-electron oxidized bright state, a process that occurs at the electrode surface. This sche...Continue Reading

References

Apr 20, 2002·Biophysical Journal·Russell E ThompsonWatt W Webb
Oct 4, 2008·Proceedings of the National Academy of Sciences of the United States of America·Ilkeun LeeFrancisco Zaera
May 18, 2010·Journal of the American Chemical Society·Allen J Bard
Oct 19, 2010·Journal of the American Chemical Society·Simon MostafaBeatriz Roldan Cuenya
Oct 25, 2011·Nature Nanotechnology·Niels de Jonge, Frances M Ross
Jan 16, 2014·Annual Review of Physical Chemistry·Justin B Sambur, Peng Chen
Feb 15, 2014·Chemical Society Reviews·Jan RongéJohan A Martens
Nov 20, 2014·Journal of the American Chemical Society·Eli A Sutter, Peter W Sutter

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