An alternative statement of the above results can be made to unify the observations under different charging conditions. Namely when the supercapacitor is charged in a negative direction (i.e. the gas-exposed electrode obtains electrons), the capture of CO2 occurs. Conversely, as the supercapacitor is charged in a positive direction, CO2 is released. Indeed, the switching protocol (Figure ), reverses the supercapacitor polarity and thereby leads to a larger adsorption capacity. The CO2 capture and release is related to the voltage polarity, which indicates the dominant role of the CO2-derived bicarbonate species with negative charges in the CO2 capture and release processes.