Experimental Data

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


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
$${{Q}_{e}}-Q_{e}^{o}=\int\limits_{\psi _{m}^{\circ }}^{{{\psi }_{m}}}{{{C}_{ms}}\left( {{\psi }_{m}} \right)\alpha {{\psi }_{m}};\sigma -{{\sigma }^{\circ }}=}\int\limits_{\psi _{m}^{\circ }}^{{{\psi }_{m}}}{{{Q}_{e}}\left( {{\psi }_{m}} \right)\alpha {{\psi }_{m}}}$$


Capacity Curve Mercury Electrode Differential Capacity Electronic Part Electrode Charge 
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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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