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In Situ Growth of MnO 2 Nanosheets on N‐Doped Carbon Nanotubes Derived from Polypyrrole Tubes for Supercapacitors
Author(s) -
Ou Xu,
Li Qi,
Xu Dan,
Guo Jiangna,
Yan Feng
Publication year - 2018
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201701752
Subject(s) - materials science , supercapacitor , polypyrrole , carbon nanotube , nanocomposite , chemical engineering , electrochemistry , capacitance , doping , nanotechnology , electrode , composite material , polymer , chemistry , polymerization , optoelectronics , engineering
Nitrogen‐doped porous carbon nanotubes@MnO 2 ( N ‐CNTs@MnO 2 ) nanocomposites are prepared through the in situ growth of MnO 2 nanosheets on N‐CNTs derived from polypyrrole nanotubes (PNTs). Benefiting from the synergistic effects between N‐CNTs (high conductivity and N doping level) and MnO 2 nanosheets (high theoretical capacity), the as‐prepared N‐CNTs@MnO 2 ‐800 nanocomposites show a specific capacitance of 219 F g −1 at a current density of 1.0 A g −1 , which is higher than that of pure MnO 2 nanosheets (128 F g −1 ) and PNTs (42 F g −1 ) in 0.5 m Na 2 SO 4 solution. Meanwhile, the capacitance retention of 86.8 % (after 1000 cycles at 10 A g −1 ) indicates an excellent electrochemical performance of N‐CNTs@MnO 2 prepared in this work.