Class for deriving surface potential difference variables from the electrode and electrolyte potentials
param (parameter class) – The parameters to use for this submodel
domain (str) – The domain in which the model holds
options (dict) – A dictionary of options to be passed to the model.
A public method that creates and returns the variables in a submodel which require variables in other submodels to be set first. For example, the exchange current density requires the concentration in the electrolyte to be created before it can be created. If a variable can be created independent of other submodels then it should be created in ‘get_fundamental_variables’ instead of this method.
A method to set the boundary conditions for the submodel. Note: this method
modifies the state of self.boundary_conditions. Unless overwritten by a
submodel, the default behaviour of ‘pass’ is used a implemented in
variables (dict) – The variables in the whole model.