degraded and was released into the electrolyte. However, it is unknown if this degradation can account for an electronic capacity loss of 28%, thus still allowing for the possibility that some anthraquinone becomes electrochemically inaccessible after a reaction with CO2. In the future, a full investigation of the factors determining stability in these systems will be carried out, so that more stable sorbents can be obtained. Finally, we note that our materials are readily tunable since both the porous carbon and the redox-active support can be readily varied. Indeed, we functionalised a second porous carbon which also showed evidence for electrochemical CO2 capture (Figure .1).