Nonlinear macrokinetics in a reaction-diffusion system

For a reaction S - P, the affinity is A = ps - pP. After substituting the chemical potentials of the substrate and product in an ideal system, p p 1 lnC, where p° is any reference state, or the component compositions in the form (Sieniutycz, 2004) 

the stoichiometric coefficients vs = — 1 and vP = 1 are used. The exchange current JI0 satisfies the microscopic reversibility at the state of thermodynamic equilibrium. These relations can be applied to chemical reactions with ionic substances by replacing the chemical potentials with electrochemical potentials. 

Consider an elementary generalized chemical reaction step 

The 1 IT and fi/T appear in the thermodynamic conjugates of the extensive variables in the Gibbs equation for the system entropy 

When the transport process is fast, potentials are equal at forward and backward states. 

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