Controllable synthesis and capacitive performance of nitrogen-doped porous carbon from carboxymethyl chitosan by template carbonization method

摘要: Solution-phase method and solid-phase have been implemented to synthesize highly porous carbon via a template carbonization process, in which N,O-carboxymethyl chitosan (NOCC) Zn(NO3)2·6H2O serve as the carbon/nitrogen source template, respectively. It reveals that different synthesis pathways significant effects on morphologies, structures, porosities, capacitive properties of samples. All resultant samples are amorphous nature. The C-T-1:1 sample from solution-phase exhibits high porosity than C-D-1:1 method. displays highest BET surface area 1956 m2 g−1 largest pore volume 1.48 cm3 g−1 possesses nitrogen content 2.06 %. Meanwhile, shows lower 1228 m2 g−1 smaller 0.9 cm3 g−1, but higher 4.22 %. As result, is endowed with outstanding electrochemical properties, whose specific capacitance reaches up 325.0 F g−1 at 1 A g−1 when conducted 6 mol L−1 aqueous KOH electrolyte, compared 173.2 F g−1 sample. Furthermore, still remains 174.8 F g−1 10 A g−1 good stability over 5000 cycles. Thus, developed herein may provide promising route for facile large-scale production materials NOCC high-performance supercapacitors.