Electrochemical CO2 reduction presents a promising solution to close the carbon cycle by utilizing CO2 emissions. For this technology to have a significant impact, it must be implemented on an industrial scale. While plants naturally reduce CO2 via photosynthesis, machines can potentially surpass them by delivering electrons electrochemically, leading to better selectivity and efficiency in CO2 conversion processes.Aqueous electrochemical CO2 reduction (ECR) involves transferring electrons from a solid electrode to CO2 in solution, converting CO2 into valuable compounds. Interest in ECR has surged due to the urgent need for CO2 mitigation measures in response to the adverse implications of climate change caused by increasing atmospheric CO2 levels. Pulsing strategies have been found to enhance the stability, selectivity, and activity of reactions, while also providing valuable insights into the mechanisms of the ECR process. We first introduce a basic model to understand the concentration profiles of substances in the electrolyte within the boundary layer. This model serves as the foundation for our research. We then discuss the configuration of gas diffusion electrode (GDE)-based CO2 electrolysis in COMSOL Multiphysics. Utilizing data from these simulations, we gain profound insights into local current density, pH, and their potential interconnections. Future work will involve incorporating additional reactions into the model and enhancing its complexity by introducing bubbling effects and catalyst degradation, thereby increasing its realism. This approach aims to optimize the electrochemical CO2 reduction process, paving the way for its successful industrial-scale implementation.