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    Imaging Electrode Heterogeneity Using Chemically Confined Fluorescence Electrochemical Microscopy
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    Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
    *E-mail: [email protected]. Tel: +44(0)1865275 957. Fax: +44(0)1865275410.
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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2017, 8, 24, 6124–6127
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    https://doi.org/10.1021/acs.jpclett.7b02925
    Published December 6, 2017
    Copyright © 2017 American Chemical Society
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    Abstract

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    By varying the total and the relative concentrations of a strong acid (HClO4) and a pH-sensitive fluorescent dye (8-hydroxypyrene-1,3,6-trisulfonate), this work demonstrates that both the hydrogen evolution reaction or the oxygen reduction reaction can be selectively and optically studied at an electrochemical interface. The local pH shift driven by the redox reaction can be visualized through fluorescence imaging of the interface. The use of finite strong acid concentrations further serves to constrain the pH change to a thin layer adjacent to the surface. This chemical confinement of the fluorophore improves the system’s resolution and enables micrometer scale heterogeneity on the electrode surface to be readily visualized.

    Copyright © 2017 American Chemical Society

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpclett.7b02925.

    • Electrochemical response of a carbon fiber electrode for the ORR and HER, fluorescence imaging of carbon fiber as a function of acid concentration, imaging the HER at an epoxy-coated carbon fiber, SEM images of a carbon fiber modified with PtNPs, experimental details, and optical cell design (PDF)

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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2017, 8, 24, 6124–6127
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpclett.7b02925
    Published December 6, 2017
    Copyright © 2017 American Chemical Society
    Request reuse permissions

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