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A free-standing honerycomb-like N doped carbon (FHNC) was fabricated by one-step carbonization and activation of the commercial melamine foam loading coal tar pitch and KOH. The as-prepared FHNC exhibits three-dimensional interconnected architecture with hierarchical honeycomb-like structure, which has a large specific surface area of 3105 m2 g−1. The specific capacitance of FHNC is 280.3 F g−1 at 1 A g−1, and still maintains 185.4 F g-1 at 40 A g−1, indicating the good rate capability. • A free-standing honeycomb-like N doped carbon (FHNC) was fabricated by the commercial melamine foam and coal tar pitch. • FHNC electrodes have a large specific surface area of 3105 m2 g−1. • The specific capacitance of FHNC is 280.3 F g−1 at 1 A g−1. • The supercapacitors show 10.1 Wh kg−1 at a power density of 250 W kg−1. • The capacity retention of supercapacitor device is 96.3% after 10,000 cycles. A free-standing honeycomb-like N doped carbon foam (FHNC) is fabricated by one-step carbonization and activation of the commercial melamine foam loading coal tar pitch and KOH. The as-prepared FHNC exhibits the three-dimensional (3D) interconnected architecture with hierarchical honeycomb-like structure, which has a large specific surface area of 3105 m2 g−1. The specific capacitance of FHNC reaches up to 280.3 F g−1 at 1 A g−1, and still maintains 185.4 F g−1 at 40 A g−1, indicating the excellent rate capability. Additionally, the assembled symmetrical supercapacitor demonstrates the maximum energy density of 10.1 Wh kg−1 at a power density of 250 W kg−1, and excellent cycling stability (96.3% capacitance retention after 10,000 charge-discharge cycles at 5 A g−1). The outstanding electrochemical performance is assigned to the unique 3D interconnected architecture that endow the large accessible surface area, and rapid transfer pathway for ion and electron. [ABSTRACT FROM AUTHOR]

N-doped porous carbon nanosheets were prepared from glucose with g-C 3 N 4 derived from dicyandiamide as a self-sacrificed template, which have a high nitrogen content of 12.01 at.% and a specific surface area of 492.7 m 2  g −1 . The unique structure allows for exhibiting high specific capacitance of 250.64 F g −1 and excellent rate capability. [ABSTRACT FROM AUTHOR]

In this paper, willow leaves were used to prepare activated carbons (ACs) by one-step pyrolysis with ZnCl 2 activation. The as-prepared AC-1-800 exhibits porous structure with high specific surface area of 1031 m 2 g −1 and a large pore volume of 0.66 cm 3 g −1 . As a supercapacitor electrode, it shows a good capacitive performance in 6 M of KOH aqueous electrolyte, such as the specific capacitance reaches 216 F g −1 at a current density of 0.1 A g −1 and the retention of specific capacitance is 97% after 1000 cycles at 2 A g −1 . [ABSTRACT FROM AUTHOR]