Jump to main content
Jump to site search


Hierarchical structure N, O co-doped porous carbon/carbon nanotubes composite derived from coal for supercapacitors and CO2 capture

Abstract

The energy and environmental crisis forces us to search for new green energy and develop energy storage and environmental restoration technology. Fabrication of carbon functional materials derived from coal has attracted increasing attention among the energy storage and gas adsorption fields. In this work, N, O co-doped porous carbon/carbon nanotubes composite was prepared by functionalizing coal based porous carbon with carbon nanotubes (CNTs) and ionic liquid annealing. The resulting materials not only inherited the morphology of CNTs and porous carbon, but also developed the three dimension (3D) hierarchical porous structure with numerous heteroatom groups. N, O co-doped porous carbon/CNTs composite (N, O-PC-CNTs) showed a phrase surface area of 2164 m2 g-1, and high level N/O dopants (8.0 and 3 at%). Benefiting from such merits, the N, O-PC-CNTs exhibited a rather high specific capacitance of 287 F g-1 at current densities of 0.2 A g-1, and a high rate capability (70% and 64% capacitance retention at 10 and 50 A g-1, respectively) in a three electrode system. Furthermore, N, O-PC-CNTs symmetrical supercapacitor showed a high cycling stability with 95% capacitance retention after 20, 000 cycles at 20 A g-1 and an energy density of 4.5 Wh kg-1 at a power density of 12.5 kW kg−1 in 6 mol L-1 KOH electrolyte. As CO2 adsorbents, N, O-PC-CNTs exhibited a high CO2 uptake of 5.7 and 3.7 mmol g−1 at 1 bar, at 273 and 298 K, respectively. Moreover, N, O-PC-CNTs showed cycle stability with 94% retention of the initial CO2 adsorption capacity at 298 K over 10 cycles. This report introduces a strategy to design coal based porous carbon for efficient supercapacitor electrodes and CO2 adsorbents.

Back to tab navigation

Supplementary files

Article information


Submitted
06 Dec 2019
Accepted
10 Jan 2020
First published
11 Jan 2020

This article is Open Access

Nanoscale Adv., 2020, Accepted Manuscript
Article type
Paper

Hierarchical structure N, O co-doped porous carbon/carbon nanotubes composite derived from coal for supercapacitors and CO2 capture

J. Hao, X. Wang, Y. Wang, X. Lai, Q. Guo, J. Zhao, Y. Yang and Y. Li, Nanoscale Adv., 2020, Accepted Manuscript , DOI: 10.1039/C9NA00761J

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
  • For reproduction of material from PCCP:
    [Original citation] - Published by the PCCP Owner Societies.
  • For reproduction of material from PPS:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
  • For reproduction of material from all other RSC journals:
    [Original citation] - Published by The Royal Society of Chemistry.

Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.


Social activity

Search articles by author

Spotlight

Advertisements