The CV curve of f-CMK-3 showed a large decrease in Faradaic contribution with minimal loss to double-layer capacity after 200 cycles (Figure ). Anthraquinone loading was recalculated to be 3.4 %; this accounted for the difference in electronic charge of u-CMK-3 and f-CMK-3 after 200 cycles. The lack of stability under CO2 was not seen under an N2 atmosphere. When cycling up to 3000 cycles, electronic charge capacity retention was 84% under N2 whereas under CO2 this was limited to 54% (Figure .1). The observed lack of long-term stability could be due to an irreversible reaction between f-CMK-3 and CO2. Figure shows that the electronic charge values were maintained at around 1 mmol g -1 with Faradaic efficiencies above 95 % after 200 cycles. The charge-capture efficiency was slightly lower than the value of 20% observed in the above experiment (Figure ), indicating degradation is still present in f-CMK-3 materials.