The amount of quinone present in the sample was then estimated by fitting the C NMR spectra, that were obtained in quantitative conditions, to obtain the contribution of the carbonyl anthraquinone peak to the overall spectrum (Table ). f-CMK-3 showed the highest quinone loading, followed by f-YP-80F and f-BP-1300. NMR was able to show the grafted quinone environments across the three carbons, correlating with data that was obtained from gas sorption analysis. rectangular profiles typical for double-layer capacitance (i.e. the build-up of ions at the electrode surface as the material is charged and discharged). After functionalization with the redox-active anthraquinone species, redox peaks were observed in all cases (note that two reversible redox peaks are expected for anthraquinone). For clarity, when the cell voltage was varied from 0 to -2.5 V, the functionalized electrode became more negative providing a driving force for anthraquinone reduction. Conversely, when the cell was discharged from -2.5 to 0 V, the functionalized electrode became more positive, and anthraquinone oxidation took place. The charge storage capacity of the functionalized systems is ultimately a combination of both double-layer capacitance and faradaic contributions. For CMK-3 and BP-1300, this led to an increase in electrochemical capacity after functionalization. For YP-80F on the other hand, a decrease in overall electrochemical capacity is seen following functionalization due to a larger decrease in double-layer capacitance following anthraquinone grafting. For all three samples, there is a reduction in double-layer capacitance seen at -0.3 V following functionalization. This is consistent with the presence of the grafted quinones reducing the available surface area for capacitive charging. This is in agreement with the decrease in gas uptake seen in gas sorption measurements, as well as literature on anthraquinone functionalized electrodes for energy storage. Interestingly, the shape of the two redox peaks is not consistent across the three samples. While f-CMK-3 and f-BP-1300 show two reversible redox peaks, a singular broad peak is seen for f-YP-80F. This is thought to be due to a large distribution of quinone environments with different redox potentials within the carbon structure of YP-80F.