RETRACTED: Carbonization-dependent nitrogen-doped hollow porous carbon nanospheres synthesis and electrochemical study for supercapacitors

Abstract

Abstract In this paper, a nitrogen-doped hollow microporous carbon nanospheres was synthesized via the combination of hyper-crosslinking mediated self-assembly and further pyrolysis using polylactide-b-polystyrene (PLA-b-PS) copolymers and aniline monomers as precursor. The pore structure and the correlative electrochemical performance of nitrogen-doped hollow microporous carbon nanospheres were affected by the molar mass ratio of aniline and PS in block copolymers and the carbonization conditions. The electrochemical measurements results showed that the obtained PLA 150 -PS 250 -N 4 -900-10H sample with nitrogen content of 3.57% and the BET surface area of 945 m 2 g −1 displays the best capacitance performance. At a current density of 1.0 Ag −1 , the resultant specific capacitance is 250 Fg −1 . In addition, it also exhibits high capacitance retention of ~98% after charging−discharging 1500 times at 25 Ag −1 . The results demonstrate the nitrogen-doped hollow microporous carbon nanospheres can be used as promising supercapacitor electrode materials for high performance energy storage devices.