Biomass-derived porous carbon is an excellent scientific and technologically interesting material for supercapacitor applications. In this study, we developed biomass-derived nitrogen-doped porous carbon nanosheets (BDPCNS) from cedar cone biomass using a simple KOH activation and pyrolysis method. The BDPCNS was effectively modified at different temperatures of 600 °C, 700 °C, and 800 ℃ under similar conditions. The as-prepared BDPCNS-700 electrode exhibited a high BET surface area of 2883 m2 g− 1 and a total pore volume of 1.26 cm3 g− 1. Additionally, BDPCNS-700 had the highest electrical conductivity (11.03 cm− 1) and highest N-doped content among the different electrode materials. The BDPCNS-700 electrode attained a specific capacitance of 290 F g− 1 at a current density of 1 A g− 1 in a 3 M KOH electrolyte and an excellent longterm electrochemical cycling stability of 93.4% over 1000 cycles. Moreover, the BDPCNS-700 electrode had an excellent energy density (40.27 Wh kg− 1) vs power density (208.19 W kg− 1). These findings indicate that BDPCNS with large surface areas are promising electrode materials for supercapacitors and energy storage systems.

Facile synthesis of interconnected layered porous carbon framework for high-performance supercapacitors
    Abstract
    1 Introduction
    2 Experimental section
        2.1 Materials
        2.2 BDPCNS synthesis from biomass
        2.3 Electrode preparation
        2.4 Characterization
        2.5 Electrochemical characterization
    3 Results and discussion
    4 Conclusion
    Acknowledgements 
    References

• Nagaraj Murugan(Department of Polymer Engineering, Graduate School, School of Polymer Science and Engineering and Alan G. MacDiarmid Energy Research Institute, Chonnam National University, 77 Yongbong‑ro, Buk‑gu, 61186 Gwangju, Republic of Korea)
• Sadhasivam Thangarasu(School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea)
• Sol Bin Seo(Department of Polymer Engineering, Graduate School, School of Polymer Science and Engineering and Alan G. MacDiarmid Energy Research Institute, Chonnam National University, 77 Yongbong‑ro, Buk‑gu, 61186 Gwangju, Republic of Korea)
• Yu Rim Choi(Department of Polymer Engineering, Graduate School, School of Polymer Science and Engineering and Alan G. MacDiarmid Energy Research Institute, Chonnam National University, 77 Yongbong‑ro, Buk‑gu, 61186 Gwangju, Republic of Korea)
• Sahil S. Magdum(School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea)
• Tae Hwan Oh(School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea)
• Yoong Ahm Kim(Department of Polymer Engineering, Graduate School, School of Polymer Science and Engineering and Alan G. MacDiarmid Energy Research Institute, Chonnam National University, 77 Yongbong‑ro, Buk‑gu, 61186 Gwangju, Republic of Korea)