Electrode Potential
| Formula / Notation | E = E° − (RT/nF)ln Q |
|---|---|
| Also Known As | Reduction potential, standard electrode potential (E°), half-cell potential, EMF |
What is Electrode Potential?
The potential difference between an electrode and the electrolyte solution, measured relative to a standard reference electrode. The standard hydrogen electrode (SHE) is assigned a potential of 0.00 V. Electrode potentials are used to predict spontaneity of redox reactions.
Formula & Notation
Other Names / Synonyms: Reduction potential, standard electrode potential (E°), half-cell potential, EMF
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The potential difference between an electrode and the electrolyte solution, measured relative to a standard reference electrode. The standard hydrogen electrode (SHE) is assigned a potential of 0.00 V. Electrode potentials are used to predict spontaneity of redox reactions.
Electrode potentials are used to calculate cell EMFs, determine reaction spontaneity, design batteries and fuel cells, and in analytical methods (potentiometry, ion-selective electrodes). They are fundamental to understanding corrosion, electroplating efficiency, and industrial electrolysis.
Extreme electrode potentials (large positive for oxidisers, large negative for strong reducing agents) indicate highly reactive species. Working with strong oxidising agents (peroxydisulfate, Ce⁴⁺) or strong reducing agents (Na, Li) requires specialised safety measures.
The formula or notation for Electrode Potential is: E = E° − (RT/nF)ln Q