High-performance asymmetric supercapacitors based on multilayer MnO2 graphene oxide nanoflakes and hierarchical porous carbon with enhanced cycling stability
Date of Issue2014
School of Materials Science and Engineering
In this work, MnO2/GO (graphene oxide) composites with novel multilayer nanoflake structure, and a carbon material derived from Artemia cyst shell with genetic 3D hierarchical porous structure (HPC), are prepared. An asymmetric supercapacitor has been fabricated using MnO2/GO as positive electrode and HPC as negative electrode material. Because of their unique structures, both MnO2/GO composites and HPC exhibit excellent electrochemical performances. The optimized asymmetric supercapacitor could be cycled reversibly in the high voltage range of 0–2 V in aqueous electrolyte, which exhibits maximum energy density of 46.7 Wh kg−1 at a power density of 100 W kg−1 and remains 18.9 Wh kg−1 at 2000 W kg−1. Additionally, such device also shows superior long cycle life along with ∼100% capacitance retention after 1000 cycles and ∼93% after 4000 cycles.
© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.