2D quasi-ordered nitrogen-enriched porous carbon nanohybrids for high energy density supercapacitors

摘要: Two-dimensional (2D) quasi-ordered nitrogen-enriched porous carbon (QNPC) nanohybrids, with the characteristics of an ultrathin graphite nanosheet framework and thick nitrogen-doped cladding a texture, have been synthesized via in situ polymerization assembly method. In synthesis, expandable (EG) is enlarged by intermittent microwave method, then aniline monomers are intercalated into interlayers expanded EG assistance vacuum. Subsequently, could assemble on interlayer surface EG, accompanied from to polyaniline. Meanwhile, be exfoliated nanosheets. By subsequent pyrolysis activation processes, QNPC nanohybrids prepared. As supercapacitor electrodes, typical QNPC12-700 sample derived precursor containing content 12%, high level nitrogen doping 5.22 at%, offers specific capacitance 305.7 F g(-1) (1 A g(-1)), excellent rate-capability long-term stability. Notably, extremely energy density 95.7 Wh kg(-1) at power 449.7 W ionic liquid electrolyte can achieved. The unique structural features moderate heteroatom combines electrochemical double layer faradaic contributions, which make these ideal candidates as electrode materials for high-performance storage devices.