Nowadays the concentration of greenhouse gases is increasing, and this causes the rising up of the temperature over the time. For example, in the modern society the high consumption of fossil fuel is unavoidable to keep up the progress and this causes high CO2 emission. Different mechanisms can be exploited to mitigate the concentration of CO2 molecules in our atmosphere. Electrochemical CO2 reduction (ERC) is now taking much more attention for large-scale deployment thanks to investments and researches on renewable energies. In this project ERC was performed using a membrane based flow reactor and Cu was chosen as catalyst material because Cu is the only known metal that can catalyse CO2 in multi-carbons products with acceptable activity and efficiency.