What Is the Butler-Volmer Electrochemical Kinetics Calculator?
The Butler-Volmer equation describes how electrical potential across an electrode/electrolyte double layer drives electron transfer.
It accounts for both the forward (anodic) and reverse (cathodic) reaction rates simultaneously.
How Does the Butler-Volmer Electrochemical Kinetics Calculator Work?
At low overpotentials (|η| < 10 mV), the equation linearizes to Ohm’s law with charge transfer resistance Rct = RT / (n·F·i0).
At high overpotentials, the reverse term becomes negligible, reducing to the logarithmic Tafel equation.
Butler-Volmer Electrochemical Kinetics Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Fundamental Butler-Volmer activation overpotential relationship.
How to Use the Butler-Volmer Electrochemical Kinetics Calculator
- Specify exchange current density, transfer coefficient α, electron stoichiometry, and applied overpotential.
- Inspect net current density, partial currents, and charge transfer resistance.
Step-by-Step Example Calculation
Anodic Dissolution Overpotential
Input Values:
Understanding Your Result
A positive overpotential drives net anodic oxidation, while negative overpotential drives reduction.
Factors That Affect the Result
- Electrocatalysts increase exchange current density i0 by orders of magnitude, lowering required overpotential.
When Should You Use This Calculator?
- Electrochemical impedance spectroscopy (EIS), fuel cell polarization curve modeling, and battery kinetics.
Assumptions & Limitations
- Valid for activation-controlled single-step charge transfer processes without mass transport limitations.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Exact microscopic formulation derived from transition state theory.