Finally, long cycling studies were carried out between -1 to -2 V to monitor the cell degradation over 200 cycles (Figure ). Following initial losses, the CO2 adsorption capacity began to stabilize around 0.2 mmol g -1 . u-CMK-3 showed much smaller adsorption capacities, with no overlap seen between u-CMK-3 and f-CMK-3 within error (Figure ). We hypothesize that some anthraquinone was lost from f-CMK-3 during cycling under CO2. The loss of anthraquinone after CO2 capture was further investigated using electrochemical techniques.