Porous reduced graphene oxide paper as a binder-free electrode for high-performance supercapacitors

A facile template approach is developed to prepare highly conductive and flexible reduced graphene oxide (rGO) paper with hierarchical porous structures. When used as an electrode for a capacitor, these porous carbon layers demonstrate an enhanced electrochemical performance due to their large ion-accessible surface area and efficient electrolyte-ion transport pathways. The porous rGO electrode delivers a specific capacity of 173.5 F g(-1), almost 1.8 times higher than 95.1 F g(-1) of packed rGO. More importantly, the porous electrode also exhibits a good electrochemical performance with an energy density of 28.5 W h kg(-1) and power density of 4000 W kg(-1), as well as excellent cycling stability with 101.5% of its initial capacitance after 2000 charge-discharge cycles at a current density of 5 A g(-1).