Battery knowledge · Electrochemistry fundamentals
Charge transfer
The step in which an electron crosses the interface between electrode and electrolyte as an ion is inserted or removed. Its resistance appears as a semicircle in impedance spectra and grows as films thicken and the cell cools.
Example
Overpotential drives reaction current
At equilibrium net current is zero. At +50 mV, current density is 2.268 A/m².
Fixed concentrations, symmetric transfer coefficients and no transport limitation.
Explore the graph
At equilibrium, forward and reverse reaction currents cancel.
At equilibrium net current is zero. At +50 mV, current density is 2.268 A/m².
i = 2i₀ sinh(Fη / 2RT)
Illustrative model. Fixed concentrations, symmetric transfer coefficients and no transport limitation.
Use in Lemonergy
Connect reaction sites and transport paths.
This is a reference concept. No executable Lemonergy block has been verified for this term.
References & further reading
Further reading on this topic
These sources provide broader context; they are not presented as citations for every statement in this entry.
- Quantities, Units and Symbols in Physical Chemistry, 3rd edition, 2nd printing
IUPAC · 2011
Topic background · Physical-chemistry notation, thermodynamics, electrochemistry and transport quantities.