Biomass-based porous carbon/graphene self-assembled composite aerogels for high-rate performance supercapacitor

摘要

Improving the conductivity and optimizing hierarchical porous structures are the efficient strategies to enhance the electrochemical performance of biomass-based porous carbon. Herein, high rate performance biomass-based porous carbon/graphene composite aerogels with the new hierarchical porous hybrid architectures were successfully synthesized by chemical self-assembly method using nontoxic Vitamin C as a reducing agent. As an electrode material for supercapacitor, the as-prepared composite aerogels not only show good conductivity and high specific surface of 893.9 m(2) g(-1), but also display ultrahigh specific capacitance and rate performance of 176 F g(-1) at 20 A g(-1) and 81.6% at current density ranging from 0.5 to 20 A g(-1), respectively. Moreover, the composite aerogels-based device exhibits excellent cycling stability of up to 99.9% after 10000 cycles at a current density of 2 A g(-1) and a higher energy density of 6.11 Wh kg(-1) at 5000 W kg(-1) compared with the individual porous carbon. The facile strategy developed here is of great significance to further improve and control the performance of biomass-based porous carbon and promote its development as high-rate performance electrode materials in the field of energy storage.