With high redox activity, superior conductivity, abundant pores, and large specific surface area, nitrogen-doped graphitic carbon featuring a hierarchically porous structure is regarded as ideal electrode material for supercapacitors. In this work, hierarchically porous nitrogen-doped graphitic carbon (PG-PZC50) was fabricated via non-solvent induced phase separation and high-temperature calcination processes. SEM images showed its three-dimensional network structure, with abundant macro- and mesopores distributed throughout. XRD and Raman spectra confirmed the phase purity and graphitic nature of the as-prepared material, while XPS revealed its surface elemental composition, especially the content and doping states of nitrogen atoms. The graphene oxide-induced three-dimensional network, combined with the mesoporous structure of metalorganic framework-derived N-doped carbon particles, creates abundant migration channels and a large adsorption surface area for the electrolyte ions. Benefiting from its hierarchically porous structure and high nitrogen-doping content, the formed PG-PZC50 reached high specific capacitances of 499.7 F g− 1 at 0.1 A g− 1 and 179.6 F g− 1 at 20 A g− 1. Notably, the material also demonstrated robust cyclic stability with no capacitance loss after 10,000 charge–discharge cycles. The proposed synthetic strategy provides new ideas for the facile and reproducible construction of nitrogen-doped graphitic carbon with 3D hierarchically porous structure and high capacitive performances.

Graphene oxidepolyacrylonitrilemetal-organic framework-derived nitrogen-doped graphitic carbon electrode with hierarchically porous structure and high capacitive performance
    Abstract
    1 Introduction
    2 Experimental section
        2.1 Material
        2.2 Preparation procedure
            2.2.1 Synthesis of P-ZIF-8
            2.2.2 Synthesis of PG-PZCX
        2.3 Characterization
        2.4 Electrochemical measurements
    3 Results and discussion
    4 Conclusion
    Acknowledgements 
    References

• Zhongyun Xu(School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China)
• Na Zhang(School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China)
• Hui Wang(School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China, College of Renewable Energy, Hohai University, Changzhou 213022, People’s Republic of China)
• Lirong Kong(School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China) Corresponding author
• Qingqing Li(College of Renewable Energy, Hohai University, Changzhou 213022, People’s Republic of China)
• Yajun Cheng(College of Renewable Energy, Hohai University, Changzhou 213022, People’s Republic of China)