Capacitive performance of ordered mesoporous carbons with tunable porous texture in ionic liquid electrolytes

► The prepared carbons possess tunable mesopore size and surface chemical properties. ► Ion diffusion in the carbon channels is determined to the surface chemical property. ► The capacitance retention ratio is determined to the surface chemical property. ► The prepared carbons present visible pseudo-capacitance in hydrophilic EMImBF4. ► No visible pseudo-capacitive behavior was observed in hydrophobic EMImTSFI.