03083 IUPAC Gold Book - interfacial concentration 10.1351/goldbook.I03083 I03083 current 1 The interfacial concentration \(c_{\rm{B},\rm{e}}\) (or simply \(c_{\rm{e}}\)) of a species B is the concentration of that species at the boundary of the electrical double-layer facing the solution, i.e. just outside the region where the departures from the electroneutrality of the solution are significant. This concept is mainly used in the usual case where the thickness of the electric double layer is very small as compared to that of the diffusion layer. It is often calculated from theory or derived from measurements of the limiting current. diffusion layer https://goldbook.iupac.org//terms/view/D01725 electrical double-layer https://goldbook.iupac.org//terms/view/I03084 limiting current https://goldbook.iupac.org//terms/view/L03532 mass transfer coefficient https://goldbook.iupac.org//terms/view/M03754 PAC, 1981, 53, 1827. 'Nomenclature for transport phenomena in electrolytic systems' on page 1837 (https://doi.org/10.1351/pac198153101827) PAC, 1980, 52, 233. 'Electrode Reaction Orders, Transfer Coefficients and Rate Constants. Amplification of Definitions and Recommendations for Publication of Parameters' on page 236 (https://doi.org/10.1351/pac198052010233) https://goldbook.iupac.org/terms/view/I03083/html https://goldbook.iupac.org/terms/view/I03083/json https://goldbook.iupac.org/terms/view/I03083/plain Citation: 'interfacial concentration' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.I03083 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-11T19:13:57+00:00