Overpotential

{
  "id": "MLC-T-CHM-008381",
  "term": "Overpotential",
  "field": "Chemistry",
  "definition": "The difference between the actual potential at which an electrochemical reaction occurs and the reversible (equilibrium) potential for that reaction, under conditions where a net current is flowing. It represents the extra driving force required to overcome kinetic barriers and achieve a desired reaction rate. Overpotential can be categorized as activation, concentration, or ohmic overpotential.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "deviation"
  ],
  "references": [
    "Green Book, 2nd ed., p. 60 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/overpotential/"
}