Further studies also observed a lack of correlation between the pore size and capacitance , with only a modest increase of 17% observed for pores around 0.75 nm from computational investigations . These contrasting results have led to unclear design principles for improving EDLC electrodes and suggest that an additional unknown structural variable impacts the capacitance. There is thus an urgent need for new investigations that unpick the connection (if any) between the structure of nanoporous carbons and their capacitance.