Nitrogen-Superdoped 3D Graphene Networks for High-Performance Supercapacitors

An N-superdoped 3D graphene network structure with an N-doping level up to 15.8 at% for high-performance supercapacitor is designed and synthesized, in which the graphene foam with high conductivity acts as skeleton and nested with N-superdoped reduced graphene oxide arogels. This material shows a highly conductive interconnected 3D porous structure (3.33 S cm⁻¹), large surface area (583 m² g⁻¹), low internal resistance (0.4 Ω), good wettability, and a great number of active sites. Because of the multiple synergistic effects of these features, the supercapacitors based on this material show a remarkably excellent electrochemical behavior with a high specific capacitance (of up to 380, 332, and 245 F g⁻¹ in alkaline, acidic, and neutral electrolytes measured in three-electrode configuration, respectively, 297 F g⁻¹ in alkaline electrolytes measured in two-electrode configuration), good rate capability, excellent cycling stability (93.5% retention after 4600 cycles), and low internal resistance (0.4 Ω), resulting in high power density with proper high energy density.

An N-superdoped 3D graphene network structure is synthesized to achieve highly conductive interconnected 3D porous structure and high N-doping level simultaneously. The supercapacitors based on this material show a remarkably high capacity, good rate capability, and excellent cycling stability.

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