09077 IUPAC Gold Book - open circuit potential 10.1351/goldbook.09077 09077 current initialism: OCP 1 Electrode potential of working electrode relative to the reference electrode when no potential or electric current is being applied to the electrochemical cell. In the case of a reversible electrode system, the OCP is also referred to as the equilibrium electrode potential. Otherwise, it is called the rest potential, or the corrosion potential, depending on the system being studied. electrochemical cell https://goldbook.iupac.org//terms/view/09058 equilibrium electrode potential https://goldbook.iupac.org//terms/view/09064 PAC, 2020, 92, 641. 'Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)' on page 653 (https://doi.org/10.1515/pac-2018-0109) https://goldbook.iupac.org/terms/view/09077/html https://goldbook.iupac.org/terms/view/09077/json https://goldbook.iupac.org/terms/view/09077/plain Citation: 'open circuit potential' 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.09077 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. 2026-07-22T23:23:25+00:00