Supercapacitors (SCs), which have been extensively applied in consumer electronics and energy management, are alternative energy storage devices for their high power densities. Electrochemical double layer capacitors (EDLCs) storing charge on the interface between electrode and electrolyte and pseudocapacitors associated with rapid surface redox reaction are the two categories of SCs. The former requires carbon materials with high specific surface area, high conductivity and suitable pore channels to achieve promising specific capacitance and long cycling life. N-doped activated carbon has been synthesized using cork, a biomass waste obtained from the bark of oak trees as carbon source by a two step thermal annealing process. The obtained carbon material possesses honey comb structure with microporous structure, high specific surface area (up to 1172 m² /g) and large pore volume (0.12 cm³/g). Besides, N-doped carbon (CAC 1:1) with a nitrogen content of 5.17 wt.% exhibits a maximum specific capacitance of 185 F/g at a current density of 1 A/g in 6 M KOH aqueous electrolyte. It also displays a good rate performance, i.e., 176 F/g at 10 A/g and cycle stability, i.e., ~80.3% retention after 1175 charge-discharge cycles. The assembled CAC1:1 symmetric capacitor exhibits a maximum energy density of 20.2 Wh/kg at a power density of 448 W/kg within a voltage range of 0 - 1.8 V in 1M Na₂SO₄ aqueous electrolyte. The unique porous structure and N-doping characteristic endue the electrode material a potential candidate for high-performance supercapacitors.