Concise N-doped Carbon Nanosheets/Vanadium Nitride Nanoparticles Materials via Intercalative Polymerization for Supercapacitors
China Postdoctoral Science Foundation, Natural Science Foundation of Gansu Province, National Natural Science Foundation of China
J201402, 2015T81064,2014M552509, 1506RJZA098, 51203071,51763014,51363014,51463012
Department of Chemistry
N-doped carbon nanosheets/vanadium nitride nanoparticles (N-CNS/VNNPs) are synthesized via a novel method combining surface-initiated in-situ intercalative polymerization and thermal-treatment process in NH3/N2 atmosphere. The pH value of the synthesis system plays a critical role in constructing the structure and enhancing electrochemical performance for N-CNS/VNNPs, which are characterized by SEM, TEM, XRD, and XPS, and measured by electrochemical station, respectively. The results show that N-CNS/VNNPs materials consist of 2D N-doped carbon nanosheets and 0D VN nanoparticles. With the pH value decreasing from 2 to 0, the sizes of both carbon nanosheets and VN nanoparticles decreased to smaller in nanoscale. The maximum specific capacitance of 280 F g-1 at the current density of 1 A g-1 for N-CNS/VNNPs is achieved in three-electrode configuration. The asymmetric energy device of Ni(OH)2||N-CNS/VNNPs offers a specific capacitance of 89.6 F g-1 and retention of 60% at 2.7 A g-1 after 5000 cycles. The maximum energy density of Ni(OH)2 ||N-CNS/VNNPs asymmetric energy device is as high as 29.5 Wh kg-1.
Tan, Y.; Liu, Y.; Tang, Z.; Wang, Zhe; Kong, L.; Kang, L.; Liu, Z.; and Ran, F., "Concise N-doped Carbon Nanosheets/Vanadium Nitride Nanoparticles Materials via Intercalative Polymerization for Supercapacitors" (2018). Faculty and Staff Publications. 134.