Struct ButlerVolmer 

pub struct ButlerVolmer {
    pub i0: f64,
    pub alpha_a: f64,
    pub alpha_c: f64,
    pub temperature: f64,
}

Butler-Volmer electrode kinetics.

Models the current–overpotential relationship: i = i₀ · [exp(αa · F · η / RT) − exp(−αc · F · η / RT)]

Fields

i0: f64

Exchange current density i₀ [A/m²].

alpha_a: f64

Anodic charge-transfer coefficient αa (dimensionless, typically 0.5).

alpha_c: f64

Cathodic charge-transfer coefficient αc (dimensionless, typically 0.5).

temperature: f64

Absolute temperature T [K].

Implementations

impl ButlerVolmer

pub fn new(i0: f64, alpha_a: f64, alpha_c: f64, temperature: f64) -> Self

Create a new Butler-Volmer model.

pub fn f_over_rt(&self) -> f64

Compute the dimensionless factor F/(RT) [V⁻¹].

pub fn current_density(&self, eta: f64) -> f64

Current density [A/m²] at overpotential eta [V].

pub fn charge_transfer_resistance(&self) -> f64

Linearised charge-transfer resistance [Ω·m²] near equilibrium (η → 0).

Rct = RT / [i₀ · (αa + αc) · F]

pub fn tafel_slope_anodic(&self) -> f64

Anodic Tafel slope [V/decade].

ba = ln(10) · RT / (αa · F)

pub fn tafel_slope_cathodic(&self) -> f64

Cathodic Tafel slope [V/decade].

bc = ln(10) · RT / (αc · F)

pub fn tafel_overpotential(&self, i_target: f64) -> f64

Overpotential [V] for a target current density using the Tafel approximation.

Valid for |η| >> RT/F (large overpotential limit). Sign follows the input i_target: positive → anodic branch.

Trait Implementations

impl Clone for ButlerVolmer

fn clone(&self) -> ButlerVolmer

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ButlerVolmer

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.