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Supercapacitors have shown substantial promise in electrochemical energy storage devices, where porous carbon materials demonstrate exceptional potential applications in their electrodes owing to their large specific surface area, high electrical conductivity, and rationally tunable pore architectures.
Sodium lignosulfonate and graphene oxide-based porous carbon materials (LC/rGO) were prepared and characterized. The electrochemical performance of the samples was investigated with three-electrode configurations.
LC/rGO demonstrated mesoporous architecture and excellent electrochemical performance. The kinetic analysis on the electrochemical properties of the materials revealed an electric double-layer capacitance dominated energy storage mechanism.
XRD and Raman analysis on the structures of the as-prepared carbon materials suggested a relatively high degree of defects and disorder. Investigations on the morphology, the pore size distributions and the surface chemistry of the samples demonstrated that the materials had a high specific surface area, mesporous structures and multi-atomic doping of nitrogen and oxygen functional groups. All these features could be taken into account for the high electrochemical performance of carbon.
LC/rGO as an electrode material demonstrated a high specific capacitance of 296 F g-1 at 0.1 A g-1 and outstanding cycling stability with 97% of the initial capacitance after 10,000 cycles at 5 A g-1 in a 6 M KOH electrolyte. The assembled symmetric supercapacitor using the as-synthesized materials exhibited energy density of 10.6 Wh kg-1 at 300 W kg-1 and cycling stability of 95% capacitance after 10,000 charge-discharge cycles, promising for supercapacitor applications.