In this work, we present a facile approach to synthesize porous carbon materials via a two-step fabrication process using eulaliopsis binata (EB) as the biomass precursor. The dried EB is directly subjected to pyrolysis at a moderate temperature (500 degrees C) followed by KOH activation at high temperature (850 degrees C), giving EB-derived porous carbons. By optimizing the KOH/carbon mass ratio and activation temperature to balance the porosity and capacitance, the resulting porous carbon shows an extremely high specific surface area (2273 m(2) g(-1)) and pore volume (1.19 m(3) g(-1)) as well as excellent capacitive performance with a specific capacitance of 373 F g(-1) at 0.5 A g(-1). Such low-cost, highperformance, biomass-derived electrode material is potentially useful for high-power supercapacitors. (C) 2015 Elsevier Ltd. All rights reserved.