3 years ago

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

Nitrogen-Superdoped 3D Graphene Networks for High-Performance Supercapacitors
Youwei Du, Feng Li, Hui-Ming Cheng, Guoxian Li, Chaoqun Ma, Weili Zhang, Wencai Ren, Kaiyu Zhang, Chang Liu, Chuan Xu, Nujiang Tang, Yuzuo Wang
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.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201701677

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