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Experimental Data

  • G. A. Martynov
  • R. R. Salem
Part of the Lecture Notes in Chemistry book series (LNC, volume 33)

Abstract

Only a few parameters of the double layer can usually be determined in experiment. First of all, it is the electrocapillary curve σ(ψ m ), that is dependent on surface tension of a (liquid) electrode σ on the potential ψ m , and also the differential capacity curves Cm-s(ψ m ) for a metal-solution interface. Unfortunately, the information carried both by the former and the latter is identical, to a considerable extent. Indeed, it is known from thermodynamics that the electrode charge \({{Q}_{e}}={d\sigma }/{d\psi _{m}^{2}}\;\) and, hence, the differential capacity of EDL \({{c}_{m-s}}={d{{Q}_{e}}}/{d{{\psi }_{m}}}\;={{{d}^{2}}\sigma }/{d\psi _{m}^{2}}\;\). Thus, using an electrocapillary curve measured with a sufficient accuracy, we can reconstruct a differential capacity curve Cm-s(ψ m ). The in-verse procedure is, however, impossible, since
$${{Q}_{e}}-Q_{e}^{o}=\int\limits_{\psi _{m}^{\circ }}^{{{\psi }_{m}}}{{{C}_{ms}}\left( {{\psi }_{m}} \right)\alpha {{\psi }_{m}};\sigma -{{\sigma }^{\circ }}=}\int\limits_{\psi _{m}^{\circ }}^{{{\psi }_{m}}}{{{Q}_{e}}\left( {{\psi }_{m}} \right)\alpha {{\psi }_{m}}}$$

Keywords

Capacity Curve Mercury Electrode Differential Capacity Electronic Part Electrode Charge 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1983

Authors and Affiliations

  • G. A. Martynov
    • 1
  • R. R. Salem
    • 2
  1. 1.Institute of Physical Chemistry of the USSR Academy of SciencesMoscowUSSR
  2. 2.D.I. Mendeleev Chemical and Technological InstituteMoscowUSSR

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