The loss of electronic charge from anthraquinone degradation under CO2 was investigated using 1 H NMR (Figure .1). After cycling, the ionic liquid electrolyte was collected and NMR spectra showed the presence of the [bmim][TFSI] electrolyte (as expected) as well as some unknown aromatic peaks. These were compared to anthraquinone (Figure .1), but could not be accurately assigned. This could suggest a small amount of anthraquinone has Figure . Long cycling experiment of f-CMK-3 and u-CMK-3 under CO2, cycled between -1 to -2 V at 0.1 A g-1 with voltage hold for 10 minutes. A) Adsorption capacity of f-CMK-3 (red) and u-CMK-3 (black). The moving average for capture (solid line) and release (dashed) were calculated from raw data (filled and hollow circles respectively). Errors of moving average (transparent) were also calculated (Section S19). B) CV cycles of f-CMK-3 before (black) and after (red) cycling under CO2, showing a capacity decrease of 28%. C) Charge and efficiency data given for f-CMK-3 experiment. Charge (solid red line) and discharge (dashed red line) plotted. Faradaic efficiency (solid black line) and charge-capture efficiency (solid black line) also plotted.