energy of activation 

of an electrode reaction
https://doi.org/10.1351/goldbook.E02109
This is defined by the equation: U‡=−R T (∂(ln⁡I0)∂T−1)p,cj,... where I0 is the exchange current. At any overpotential η it is defined by the equation: U‡(η)=−R (∂(ln⁡(|I|))∂T−1)p,η,cj,... where I is the current passing from the electrode into the electrolyte.
Source:
PAC, 1974, 37, 499. (Electrochemical nomenclature) on page 516 [Terms] [Paper]
Citation: 'energy of activation' 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.E02109 RIS BibTex EndNote
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Last revised: February 24, 2014