{"term":{"id":"01725","title":"diffusion layer","longtitle":"IUPAC Gold Book - diffusion layer","doi":"10.1351\/goldbook.D01725","code":"D01725","status":"current","synonym":"<em>synonym<\/em>: concentration boundary layer","definitions":[{"id":1,"text":"The region in the vicinity of an electrode where the concentrations are different from their value in the bulk solution. The definition of the thickness of the diffusion layer is arbitrary because the concentration approaches asymptotically the value \\(c_{0}\\) in the bulk solution (see diagram). ","links":[{"term":"Nernst's diffusion layer","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/N04108"},{"term":"diffusion","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/D01716"}],"sources":["PAC, 1981, 53, 1827. 'Nomenclature for transport phenomena in electrolytic systems' on page 1837 (https:\/\/doi.org\/10.1351\/pac198153101827)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/D01725\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/D01725\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/D01725\/plain"},"citation":"Citation: 'diffusion layer' 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.D01725","license":"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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"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.","accessed":"2026-04-20T11:18:31+00:00"}}