Double-activated porous carbons for high-performance supercapacitor electrodes

The double-activated porous carbons (DAPCs) with unique bimodal pore structure were prepared by activating commercial microporous carbon (CMCs) twice through KOH (double activation) at high temperature. The as-prepared DAPCs show larger surface area (833 m2·g−1), and the pores are composed of micropores (size of ~1.8 nm) and mesopores (size of ~4.5 nm). Such special hierarchical porous structures integrate the dual advantages of micropore and...