Term: photoelectrochemistry https://doi.org/10.1351/goldbook.P04607 Definition: A term applied to a hybrid field of chemistry employing techniques which combine photochemical and electrochemical methods for the study of the oxidation-reduction chemistry of the ground or excited states of molecules or ions. In general, it is the chemistry resulting from the interaction of light with electrochemical systems. Related Terms: 1) photoelectrochemical cell (http://doi.org/10.1351/goldbook.P04605). 2) photogalvanic cell (http://doi.org/10.1351/goldbook.P04615). 3) photovoltaic cell (http://doi.org/10.1351/goldbook.P04659). 4) oxidation (http://doi.org/10.1351/goldbook.O04362). Source: PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2260 (https://doi.org/10.1351/pac199668122223) Citation: 'photoelectrochemistry' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.P04607 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. 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.