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This example simulates the electrolysis of CO2 on a roughened-Cu cathode surface in a CO2-saturated CsHCO3 electrolyte. It solves for the concentration of dissolved-CO2, Cs+, HCO3–, CO32–, H+, and OH– within the mass-transport boundary layer and accounts for the homogeneous (bi)carbonate reactions. The local CO2 concentration and pH affect the cathode reactions and results in a distribution of products formed. H2 is generated by the reduction of H2O, and a variety of carbon products are formed by CO2 reduction (CO, CH4, HCOO, C2H4, EtOH, PrOH, and AllylOH). The effect of CsHCO3 feed concentration on the product polarization curves and selectivity (faradaic efficiency) is explored.