Ochai-Ejeh, F.O. (Faith)Bello, AbdulhakeemDangbegnon, Julien K.Khaleed, Abubakar A.Madito, M.J. (Moshawe)Bazegar, FarshadManyala, Ncholu I.2017-06-262017-09Ochai-Ejeh, F.O., Bello, A., Dangbegnon, J.K., Khaleed, A.A., Madito, M.J., Bazegar, F. & Manyala, N.I. High electrochemical performance of hierarchical porous activated carbon derived from lightweight cork (Quercus suber). Journal of Materials Science (2017) 52: 10600-10613. doi:10.1007/s10853-017-1205-4.0022-2461 (print)1573-4803 (online)10.1007/s10853-017-1205-4http://hdl.handle.net/2263/61090Activated carbon (AC) derived from biomass lightweight cork (Quercus suber) material was synthesized by KOH activation with different mass ratios of Q. suber: KOH in order to investigate the electrochemical properties of the AC in relation to KOH concentration. A well-defined porous activated carbon was obtained with a high surface area of 1081 m2 g−1 and a high pore volume of 0.66 cm3 g−1 when the Q. suber: KOH mass ratio was fixed at 1:2. A specific capacitance of 166 F g−1 was obtained for the symmetric device at 0.5 A g−1 in 1 M Na2SO4 with energy and power densities of 18.6 and 449.4 W Kg−1, respectively. The device displays good cycling stability after floating test for 200 h at 1.8 V and also displays 99.8% capacitance retention after cycling for 5000 cycles. The excellent electrochemical performance of the device makes it a potential material for supercapacitor application.en© Springer Science+Business Media New York 2017. The original publication is available at : http://link.springer.comjournal/10853.Activated carbon (AC)Postprint Article