Russian Journal of Electrochemistry

, Volume 41, Issue 1, pp 17–31 | Cite as

Adsorption isotherm for a solid electrode: The link between the differential surface tension and capacitance curves

  • E. M. Podgaetskii


Investigation of thermodynamically equilibrium single-component adsorption from a liquid solution on a solid electrode with allowance made for elastic deformation of its surface ϑ is continued. A full electrocapillarity equation is derived from thermodynamics equations for an interphase layer in the absence of irreversible processes. Thermodynamic aspects of the Shuttleworth equation are discussed and the equation is compared with two-dimensional Murnaghan formulas for elastic isotropic media. An adsorption isotherm equation and compatibility equations that had been derived previously are examined in a special case where the derivative Γ of a surface concentration with respect to ϑ \(\frac{{\partial \Gamma }}{{\partial \vartheta }} \equiv \gamma \vartheta\) depends solely on Γ (γϑϑ(Γ)) and a rigorous solution of these is obtained for a deformed electrode (ϑ ≠ 0). The effect of ϑ and dimensionless electrode potential φ on the extreme (at an infinitely high adsorbate concentration) value of Γ is studied. The model of two parallel capacitors is considered in detail for a general case. Owing to the use of capacitance curves for an elastically stretched electrode, a formula that expresses the differential surface tension of a nondeformed electrode through such curves is derived for the first time ever.

Key words

adsorption solid electrode adsorption isotherm surface deformation differential surface tension capacitance curve 


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Copyright information

© MAIK “Nauka/Interperiodica” 2005

Authors and Affiliations

  1. 1.Institute of Applied MechanicsRussian Academy of SciencesMoscowRussia

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