Where FEi is the Faradaic Efficiency of product i (%), 𝑧 𝑖 is the number of protons required to obtain 1 mol of product i, F is the Faradaic constant in 𝑠 • 𝐴/𝑚𝑜𝑙, P is the pressure in Pa, 𝑦 𝑖 is the concentration of product I, 𝑉 ̇𝑡𝑜𝑡 is the total volumetric flow rate in m 3 /s, I the current, A, R the universal gas constant, 𝑚 • 𝑃𝑎 𝑚𝑜𝑙 /𝐾, T the temperature, K.