In Situ Growth of MnO Nanosheets on N-Doped Carbon Nanotubes Derived from Polypyrrole Tubes for Supercapacitors.

Nitrogen-doped porous carbon nanotubes@MnO (N-CNTs@MnO ) nanocomposites are prepared through the in situ growth of MnO 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 nanosheets (high theoretical capacity), the as-prepared N-CNTs@MnO -800 nanocomposites show a specific capacitance of 219 F g at a current density of 1.0 A g , which is higher than that of pure MnO nanosheets (128 F g ) and PNTs (42 F g ) in 0.5 m Na SO solution. Meanwhile, the capacitance retention of 86.8 % (after 1000 cycles at 10 A g ) indicates an excellent electrochemical performance of N-CNTs@MnO prepared in this work.