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Szekeres KJ, Vesztergom S, Ujvári M, Láng GG. Methods for the Determination of Valid Impedance Spectra in Non‐stationary Electrochemical Systems: Concepts and Techniques of Practical Importance. ChemElectroChem 2021. [DOI: 10.1002/celc.202100093] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Krisztina J. Szekeres
- Department of Physical Chemistry Institute of Chemistry H-1117 Budapest Pázmány P. s. 1/A Hungary
| | - Soma Vesztergom
- Department of Physical Chemistry Institute of Chemistry H-1117 Budapest Pázmány P. s. 1/A Hungary
| | - Maria Ujvári
- Department of Physical Chemistry Institute of Chemistry H-1117 Budapest Pázmány P. s. 1/A Hungary
| | - Gyözö G. Láng
- Department of Physical Chemistry Institute of Chemistry H-1117 Budapest Pázmány P. s. 1/A Hungary
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Láng GG. Some remarks to the derivation of the “generalized Lippmann equation”. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04745-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AbstractIn the present communication, an attempt is made to demonstrate (once again) some of the problems with the derivation of the “generalized Lippmann equation” considered to be valid by many researchers for solid electrodes and to address the problems in the framework of the Gibbs model of the interface by using only the basic principles of thermodynamics. By surveying the relevant literature, it has been shown that during the derivation of the equation, it was completely ignored that the Gibbs-Duhem equation (i.e., the electrocapillary equation) is a mathematical consequence which follows directly from the homogeneous degree one property of the corresponding thermodynamic potential function; consequently, the resulting expression cannot be correct. Some alternative approaches have also been considered. The adequacy of the open system and the partly closed system approach has been critically discussed, together with the possibility of introducing new thermodynamic potential functions.
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