Further characterisation was carried out to explore the cause of the large difference in anthraquinone loadings between carbon samples. Energy-dispersive X-ray (EDX) spectroscopy data was used to obtain information about the elemental composition of the bulk carbon samples (Table ). Between the three unfunctionalized carbon samples, u-BP-1300 showed the lowest amount of carbon (90 wt.%) and the highest amount of oxygen content (7.3 wt.%). Compared to the other two carbons u-BP-1300 therefore has more oxygen-containing groups. When anthraquinone was grafted to the surface, all three carbon samples showed an increase in oxygen content, consistent with the oxygen-containing quinone molecule being added to the surface. The difference in oxygen content before and after functionalization was within the range of 6.7 -8.9 wt.% however, these values cannot straightforwardly be used to calculate the amount of anthraquinone on the surface, as it is unknown how the diazonium radical reaction affects the pre-existing functionalities on the carbon. Minimal nitrogen content was seen before and after functionalization, suggesting the diazonium radical reaction successfully grafted anthraquinone loss of the amino group. Other characterisation techniques also evidenced the presence of anthraquinone on the carbon surface but have not been used for anthraquinone loading calculations (XPS: S5.1-S5.3, Elemental Analysis: Table .1). For electrochemical carbon dioxide capture, only the electrochemically accessible anthraquinone can be reduced to capture CO2 therefore it was assumed that loading values obtained from CV experiments were the most suitable metric to predict carbon capture performance.