Facile synthesis of interconnected layered porous carbon framework for high-performance supercapacitors

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 degrees C, 700 degrees C, and 800 celcius under similar conditions. The as-prepared BDPCNS-700 electrode exhibited a high BET surface area of 2883 m(2) g(-1) and a total pore volume of 1.26 cm(3) 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 long-term 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.