In this work we carry out NMR spectroscopy and capacitance measurements on a series of 20 nanoporous carbons to explore how carbon structure impacts capacitance. We find that more 75 disordered carbons have higher capacitances due to the more efficient storage of electrolyte ions in the carbon pores . Our findings go against the idea that pore size is the main structural factor in determining capacitance and will stimulate new research on the design and synthesis of improved electrodes for EDLCs.