Equation icon  Butler-Volmer equation

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Resource type: Equation
Description: The Butler-Volmer equation describes how electrical current in an electrochemical reaction depends on the electrode potential, considering both a cathodic and an anodic reaction occur on the same electrode.

TeX format: I = i_0\left( exp\left( \frac{\alpha nF\eta}{RT}\right) - exp\left(\frac{-(1-\alpha)nF\eta}{RT}\right)\right)

I {I} = Current (A) {A}
i0 {i_0} = Exchange current density (A) {A}
α {\alpha} = Transfer coefficient
F {F} = Faraday constant (Cmol-1) {Cmol^{-1}}
R {R} = Universal gas constant (JK-1mol-1) {JK^{-1}mol^{-1}}
T {T} = Temperature (K) {K}
n {n} = Number of electrons
η {\eta} = Overpotential - the difference between electrode potential and equilibrium potential. (V) {V}
Keywords: Butler-Volmer • corrosion • electrochemical • potential • cathode • anode • electrode • reaction
Categories: Science approaches
Science approaches > Corrosion & degradation > Corrosion principles
Science approaches > Corrosion & degradation > Forms of corrosion
Science approaches > Corrosion & degradation > Corrosion protection
Processes > Surface treatments > Surface coatings
Applications > Energy
Applications > Electronics
Testing, analysis & experimentation > Electrical testing
Other topics > Material selection
Created by: The University of Liverpool
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Date created: 15 July 2010
Date added: 04 August 2010
Resource ID: 3190