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Ubiquitous Preferential Water Adsorption to Electrodes in Water/1-Propanol Mixtures Detected by Electrochemical Impedance Spectroscopy

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Download Hi-Res ImageDownload to MS-PowerPointCite This:J. Phys. Chem. C 2023, 127, 48, 23382-23389
    C: Physical Properties of Materials and Interfaces

    Ubiquitous Preferential Water Adsorption to Electrodes in Water/1-Propanol Mixtures Detected by Electrochemical Impedance Spectroscopy
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    • Haruto Iwasaki
      Haruto Iwasaki
      Department of Physics, Kyushu University, Motooka 744, Fukuoka 819-0395, Japan
      More by Haruto Iwasaki
    • Yasuyuki Kimura
      Yasuyuki Kimura
      Department of Physics, Kyushu University, Motooka 744, Fukuoka 819-0395, Japan
      More by Yasuyuki Kimura
    • Yuki Uematsu*
      Yuki Uematsu
      Department of Physics and Information Technology, Kyushu Institute of Technology, Iizuka 820-8502, Japan
      PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
      *Email: [email protected]
      More by Yuki Uematsu
      Orcidhttps://orcid.org/0000-0002-4970-4696
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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2023, 127, 48, 23382–23389
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    https://doi.org/10.1021/acs.jpcc.3c05320
    Published November 23, 2023
    Copyright © 2023 American Chemical Society
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    Abstract

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    The electric double layer is an important structure that appears at charged liquid interfaces and determines the performance of various electrochemical devices such as supercapacitors and electrokinetic energy converters. Here, the double-layer capacitance of the interface between aluminum electrodes and water/1-propanol electrolyte solutions is investigated using electrochemical impedance spectroscopy. The double-layer capacitances of mixture solvents are almost the same as those of water-only electrolyte solutions, and the double-layer capacitances of 1-propanol-only solutions are significantly smaller than those of other volume fractions of water. The qualitative variation of the double-layer capacitances with the water volume fraction is independent of the electrolyte types and their concentrations. Therefore, these results can be explained by ubiquitous preferential water adsorption caused by the hydrophilicity of the electrode surface.

    Copyright © 2023 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.jpcc.3c05320.

    • Open circuit potentials in two-electrode measurements, electrochemical characterization of aluminum electrodes using a reference electrode, double-layer capacitance extracted with τ0 = RbCdS, and conversion from molar fraction to volume fraction in bulk dielectric constant data (PDF)

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    Cited By

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    This article is cited by 1 publications.

    1. Yuki Uematsu, Suguru Iwai, Mariko Konishi, Shinsuke Inagi. Zeta Potentials of Cotton Membranes in Acetonitrile Solutions. Langmuir 2024, 40 (38) , 20294-20301. https://doi.org/10.1021/acs.langmuir.4c02798
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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2023, 127, 48, 23382–23389
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpcc.3c05320
    Published November 23, 2023
    Copyright © 2023 American Chemical Society
    Request reuse permissions

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