Electrochemical gas adsorption experiments were carried out with a custom-made gas manifold device reported previously (Figure .1). Electrochemical cells for gas measurements were assembled in meshed coin cells from MTI Corporation (CR2032-CASE-MESH, 1 mm holes) and placed in the gas manifold device with the quinone-functionalized electrodes exposed to the gas reservoir. Devices were then evacuated for 10 mins and filled with pure CO2 gas (> 1.01 bar). This was repeated three times to fully exchange the N2 gas (from the glovebox environment in which the cells were prepared) with CO2. The electrochemical cells were placed in an incubator oven (SciQuip Incu-80S) at 35 ° C . This temperature was consistent with similar literature systems, enabling accurate comparison. Constant-current experiments with constant voltage holding steps were carried out while monitoring how the CO2 pressure in the system varied using a pressure transducer (Omega, PX309-030A5V) which was connected to the potentiostat as an external device, enabling simultaneous electrochemistry and cell gas pressure measurements. A decrease in pressure is then characteristic of CO2 capture by the functionalized electrode and an increase in pressure is CO2 release. The pressure difference between capture and release was then used to calculate the number of CO2 molecules captured using the ideal gas law.