As the porosity data fails to explain the wide variations in capacitance of the studied carbon series, we developed an NMR spectroscopy assay to probe local structural order and its impact on 115 capacitance (Fig. ). MAS (magic angle spinning) NMR spectra of the studied electrolyte-saturated carbons contain at least two resonances as expected (Fig. ). The left-hand resonances, with a similar chemical shift to neat electrolyte at -149 ppm, are assigned to "ex-pore" anions, while the right-hand resonances are assigned to "in-pore" anions, as in previous work . Notably, the NMR spectra of the electrolyte-saturated carbons show significant differences, particularly in 120 terms of the Δδ values (see fig. and S8 for discussion of linewidth and intensity effects). We initially hypothesized that the ion adsorption capacities measured by NMR might correlate with capacitance, but a clear correlation was not found (fig. ).