2 research outputs found
Surface Modification of CNTs with N-Doped Carbon: An Effective Way of Enhancing Their Performance in Supercapacitors
International audienc
Surface Modification of CNTs with N‑Doped Carbon: An Effective Way of Enhancing Their Performance in Supercapacitors
Carbon nanotubes have been successfully coated with a N-doped carbon
layer via hydrothermal carbonization in the presence of a nitrogen-containing
carbohydrate, i.e., glucosamine hydrochloride. By controlling the
amount of glucosamine added, it was possible to tune the N content
of the composites N-doped carbon/CNT between 1.8–2.5 wt %.
The prepared composites exhibited superior supercapacitor performance
in comparison to bare CNTs even though they possess lower textural
properties. Thus, a 2- to 4-fold increase in specific capacitance
per surface area was registered at low current densities and sweep
rates and a 2-fold increase in energy density, while keeping the power
density. Besides, the composites possess superb long-term stability,
losing only 4–6% of specific capacitance after 10,000 cycles
at 10 A g<sup>–1</sup>