Dynamic viscosity of the gas mixture. Pa s electrolytic step. This complexity often necessitates meticulous tuning of catalysts. Computational models for CO2RR on Cu catalysts known to exhibit complex microkinetics from experimental literature still rely on simple and empirically defined electrochemical parameters such as Butler-Volmer Equation (B-Ve). However, the kinetic parameters in B-Ve do not (and cannot) capture the entire reaction network. In this work, we develop a new methodology for incorporating a complex reaction network observed on Cu electrodes, using a 0D microkinetic model coupled with a mass transport model. This paper centres on the method development and shows some preliminary results