Note that the measured Δδ values are consistent irrespective of the choice of the nucleus probed (fig. ; i.e., they represent nucleus independent chemical shifts. The Δδ values are therefore indicative of the different structures of the carbons, rather than any specific interactions between the carbons and the studied ions. The correlation of capacitance with Δδ was also observed for ionic liquid 130 electrolytes (fig. ). The observed correlations are striking given that the carbons were selected from six different independent suppliers and are thus very likely synthesized by a range of different processes/conditions. Since previous studies showed that Δδ values are dominated by domain size effects (rather than pore size effects) for predominantly microporous carbons , our results further suggest that carbons with smaller ordered domains give rise to higher capacitances. To test this hypothesis ACS-PC, the most disordered nanoporous carbons in our series, was thermally annealed at a range of temperatures in argon (see Methods). We hypothesized that thermal annealing would increase structural order in the carbon , leading to carbons with larger magnitude Dd values and smaller capacitances. Importantly, gas sorption results were first performed and confirmed that there were minimal changes in the carbon pore structure upon thermal 150 annealing (fig. ), while XPS measurements revealed a decrease in oxygen content upon annealing (fig. ). For higher thermal annealing temperatures, Dd values increase in magnitude as hypothesized, consistent with the formation of carbons with larger ordered domains (Fig. ).