Here Δ𝜌 CO 2 is the change in CO 2 concentration divided by the minimum CO 2 concentration 𝜌 min during the respective cycle to obtain the relative change in CO 2 , Ω gas is the volume of the gas chamber, Ω el is the volume of the electrolyte, V exp and V CM are the maximum voltages in the experiment and computational model respectively. We do remark that the volume ratios are the same for both the experiment and the computational model.