Shape-Controlled Porous Nanocarbons for High Performance Supercapacitors

Wei Chen, R.B. Rakhi, H.N. Alshareef, “Shape-Controlled Porous Nanocarbons for High Performance Supercapacitors”
J. Mater. Chem. A, 2014,2, 5236-5243
Wei Chen, R.B. Rakhi, H.N. Alshareef
Shape-Controlled, Porous Nanocarbons, Supercapacitors
Porous activated nanocarbons with well-controlled dimensionality and morphology (i.e. 0D activated carbon nanoparticles, 1D activated carbon nanotubes, and 2D activated carbon nanosheets) were derived successfully from different template-induced polyaniline nanostructures by facile carbonization and activation processes. The obtained nanocarbons show large specific surface areas (1332–2005 m2 g−1), good conductivities, and highly porous nanoscale architectures. The supercapacitors fabricated using the shape-controlled nanocarbons exhibit high specific capacitance, excellent rate capability, and superior long-term cycling stability in both aqueous and ionic liquid electrolytes. More importantly, a very high energy density of 50.5 W h kg−1 with a power density of 17.4 kW kg−1 can be obtained from the activated carbon nanotube based supercapacitors in an ionic liquid electrolyte (with a charge time of [similar]10 s), making the shape-controlled nanocarbons promising candidates for high-performance energy storage devices.