Generally, a linear trend is observed, i.e. nanoporous carbons with larger edge length per unit area show larger capacitances (Figure ). We hypothesise that edge sites accessible to electrolyte ions are where the charges are stored most efficiently, leading to increased capacitance for nanoporous carbons with smaller graphene-like domains and larger edge length per unit area (Figure ). Summarising, the ion adsorption capacity plays an important role together with the sizes of the graphene-like domains in determining the capacitance.