In this report, we successfully prepared nitrogen-doped porous carbon (N-PC)/manganese dioxide ( MnO2) composite for a high-performance supercapacitor. X-ray diffraction data revealed the α-MnO2 phase. Transmission electron microscopy confirmed that the nanostructured α-MnO2 nanoparticles were coated on the surface of N-PC. The N-PC/α-MnO2 composite delivered a capacitance of 525.7 F g− 1 at the charging current of 1.0 A g− 1. The higher capacitance of the composite could be owing to the synergy of MnO2 and N-PC. Besides, the electrode exhibited a 14.7% capacitance loss after 6000 charge– discharge cycles at 10 A g− 1 indicating good electrochemical stability.

    Abstract
    1 Introduction
    2 Experimental
        2.1 Materials
        2.2 Synthesis of N-PCα-MnO2 composite
        2.3 Electrochemical analysis
        2.4 Characterization
    3 Results and discussion
        3.1 Structural, surface, and morphological studies
        3.2 Electrochemical measurement
    4 Conclusion
    Acknowledgements 
    References

• Stella Vargheese(Department of Nanoscience and Technology, Bharathiar University)
• Dhanaprabhu Pattappan(Department of Nanoscience and Technology, Bharathiar University)
• K. V. Kavya(Department of Nanoscience and Technology, Bharathiar University)
• M. S. Sivaramkumar(Department of Chemistry, Kongunadu Arts and Science College)
• Ramasamy Thangavelu Rajendra Kumar(Department of Nanoscience and Technology, Bharathiar University)
• Yuvaraj Haldorai(Department of Nanoscience and Technology, Bharathiar University)