Longer cycling experiments without gas pressure measurement were carried out up to 1000 cycles with a focus on the electrochemical behaviour (Figure .1-S8.3). In all three cases, the materials were more electrochemically stable under N2 than under a CO2 atmosphere with f-YP-80F having the highest stability, similar to results shown in Figure . The functionalized carbon materials were inherently unstable in the presence of CO2 suggesting there is a reaction taking place between functionalized carbon and CO2 which causes quinone molecules to become unstable resulting in low electrochemical capacity. The extent of this instability is also dependent on the carbon structure of the material as instability is seen at different rates across the three materials.