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Sci Rep. 2018 Feb 13;8(1):2915. doi: 10.1038/s41598-018-21082-w.

Concise N-doped Carbon Nanosheets/Vanadium Nitride Nanoparticles Materials via Intercalative Polymerization for Supercapacitors.

Tan Y1,2, Liu Y1,2, Tang Z3,4, Wang Z5, Kong L1,2, Kang L1,2, Liu Z6, Ran F7,8.

Author information

1
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, P. R. China.
2
School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, P. R. China.
3
Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, China.
4
Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, China.
5
Department of Chemistry, Xavier University of Louisiana, New Orleans, LA, 70125, USA.
6
Department of Physics & Engineering, Frostburg State University, Frostburg, MD, 21532-2303, USA. zliu@frostburg.edu.
7
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, P. R. China. ranfen@163.com.
8
School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, P. R. China. ranfen@163.com.

Abstract

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.

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