Nitrogen-doped carbon materials with cubic ordered mesostructure: low-temperature autoclaving synthesis for electrochemical supercapacitor and CO2 capture

Nitrogen doped ordered mesoporous carbons (NOMCs) with a 3-D body-centered cubic pore structure with uniform pore size of 2.9-3.0 nm and high BET surface area of 583-847 m(2) g (-1) have been synthesized by means of a facile and efficient low-temperature autoclaving route under basic conditions, in which triblock copolymer F127 was used as the template, and resorcinol/hexamethylenetetramine as the carbon precursor. The effect of synthesis parameters including the autoclaving temperature and autoclaving treatment time was investigated in detail. It is found that NOMCs with cubic Im ($) over bar 3m structure can be produced at the autoclaving temperature of 60 degrees C and autoclaving treatment time of >= 2 d. Benefiting from the unique features of high surface area, nitrogen doping, uniform and uninterrupted mesopores and rich microporosity, these NOMCs for supercapacitors exhibit high capacitance of 193 F g (-1) 1 at 1.0 A g (-1), high rate capacity (90% capacitance retention at 10 A g (-1)) and good cycling stability (99.1% capacity retention after 1000 cycles at 1.0 A g (-1)) in 6 M KOH aqueous solution and good cycling stability with specific capacitance retention over 500 cycles. Moreover, the NOMCs also show excellent CO2 capture properties with a capacity of 4.7 and 3.5 mmol g (-1) at 0 and 25 degrees C, respectively. It is revealed that both textural and surface chemistry properties influenced the CO2 capture performance of the resultant NOMCs adsorbents.