01847 IUPAC Gold Book - double-layer current 10.1351/goldbook.D01847 D01847 current 1 The non-faradaic current associated with the charging of the electrical double layer at an electrode-solution interface, given by: \[i_{\mathrm{DL}}=\frac{\mathrm{d}(\sigma \ A)}{\mathrm{d}t}\] where \(\sigma \) = surface charge density of the double layer, \(A\) = area of the electrode-solution interface and \(t\) = time. Capital letters should be used as subscripts to avoid the possibility of confusing this symbol with that for the limiting diffusion current. electrical double layer https://goldbook.iupac.org//terms/view/I03084 faradaic current https://goldbook.iupac.org//terms/view/F02321 interface https://goldbook.iupac.org//terms/view/I03082 limiting diffusion current https://goldbook.iupac.org//terms/view/L03534 surface charge density https://goldbook.iupac.org//terms/view/S06159 PAC, 1985, 57, 1491. 'Recommended terms, symbols, and definitions for electroanalytical chemistry (Recommendations 1985)' on page 1496 (https://doi.org/10.1351/pac198557101491) https://goldbook.iupac.org/terms/view/D01847/html https://goldbook.iupac.org/terms/view/D01847/json https://goldbook.iupac.org/terms/view/D01847/plain Citation: 'double-layer current' 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.D01847 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. 2026-04-18T11:07:19+00:00