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Herein, a protocol for determining thermodynamic properties of the rate determining state and intermediate (RDSI) of the OER is presented. Cobalt oxide is investigated at pH\u20057 as a case study. Two different approaches are employed: steady state polarization (SSP) that uses chronopotentiometry at different temperatures and current values, and potentiostatic electrochemical impedance spectroscopy (PEIS) at different DC voltages and temperatures. The data is used to fit a 3D plane from which entropy and enthalpy of the RDSI are obtained. The data analysis requires an appropriate filtering of the data. Hence, we discuss suitable figures of merit for establishing appropriate filtering criteria. The values obtained are 0.72 and \u22120.39\u2005eV (at 298\u2005K) for enthalpic and entropic contributions, respectively. The obtained values are reproducible for both approaches and consistent with literature.<\/jats:p>","DOI":"10.1002\/cctc.202301578","type":"journal-article","created":{"date-parts":[[2024,2,7]],"date-time":"2024-02-07T03:38:50Z","timestamp":1707277130000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Measurement of Enthalpy and Entropy of a Model Electrocatalyst for the Oxygen Evolution Reaction"],"prefix":"10.1002","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2147-8970","authenticated-orcid":false,"given":"Joaqu\u00edn","family":"Morales\u2010Santelices","sequence":"first","affiliation":[{"name":"Nachwuchsgruppe Gestaltung des Sauerstoffentwicklungsmechanismus Helmholtz-Zentrum Berlin f\u00fcr Materialien und Energie GmbH  Hahn-Meitner Platz\u20051 14109 Berlin Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2820-7006","authenticated-orcid":false,"given":"Marcel","family":"Risch","sequence":"additional","affiliation":[{"name":"Nachwuchsgruppe Gestaltung des Sauerstoffentwicklungsmechanismus Helmholtz-Zentrum Berlin f\u00fcr Materialien und Energie GmbH  Hahn-Meitner Platz\u20051 14109 Berlin Germany"}]}],"member":"311","published-online":{"date-parts":[[2024,2,21]]},"reference":[{"key":"e_1_2_11_1_1","unstructured":"Accelerating Hydrogen Deployment in the G7: Recommendations for the Hydrogen Action Pact International Renewable Energy Agency Abu Dhabi 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