Attempting to progress towards the unification of various kinetic and thermodynamic aspects of the ORR we fully parametrize a simplified kinetic model which depends on the presence of site-blocking species. The parameters along with their variations in potential are directly derived from our simulations demonstrating the value of such an approach in the field of computational electrochemistry. The presented results and methodologies are a step towards the understanding of the various aspects causing the overpotential of the ORR through atomistic modelling.