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      Comparative operando XPS and SEM spatiotemporal potential mapping of ionic liquid polarization in a coplanar electrochemical device

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      Author(s)
      Suzer, Sefik
      Strelcov, E.
      Kolmakov, A.
      Date
      2021-09-21
      Source Title
      Analytical Chemistry
      Print ISSN
      0003-2700
      Electronic ISSN
      1520-6882
      Publisher
      American Chemical Society
      Volume
      93
      Issue
      39
      Pages
      13268 - 13273
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      The polarization response of a coplanar electrochemical capacitor covered with an ionic liquid as the electrolyte has been examined using a combination of two powerful analytic techniques, X-ray photoelectron spectroscopy (XPS) and scanning electron microcopy (SEM). Spatiotemporal distribution of the ionic liquid surface potential, upon DC or AC (square wave) biasing, has been monitored via chemical element binding energy shifts using XPS and secondary electron intensity variations using SEM. SEM’s high spatial resolution and speedy imaging together with application of a data mining algorithm made mapping of the surface potential distribution across the capacitor possible. Interestingly, despite the differences in the detection principles, both techniques yield similar polarization relaxation time constants. The results demonstrate the power of a synergistic combination of the two techniques with complementary capabilities and pave the way to a deeper understanding of liquid/solid interfaces and for performance evaluation and diagnostics of electrochemical devices.
      Keywords
      Capacitors
      Diffusion
      Electrodes
      Polarization,
      X-ray photoelectron spectroscopy
      Permalink
      http://hdl.handle.net/11693/77503
      Published Version (Please cite this version)
      https://doi.org/10.1021/acs.analchem.1c02779
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      • Department of Chemistry 707
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