Biomass-derived wearable energy storage systems based on poplar tree-cotton fibers coupled with binary nickel-cobalt nanostructures

Hekmat F., ÜNALAN H. E., Shahrokhian S.

SUSTAINABLE ENERGY & FUELS, vol.4, no.2, pp.643-654, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 4 Issue: 2
  • Publication Date: 2020
  • Doi Number: 10.1039/c9se00565j
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.643-654
  • Middle East Technical University Affiliated: Yes


We hereby demonstrate symmetric and asymmetric supercapacitors (SSCs and ASCs) based on core/shell-like Ni-Co oxide@cotton//Fe2O3-carbon nanotubes@cotton that are capable of storing a remarkable amount of energy, while retaining a high power density and long cycle life. Hierarchical, porous structures of Ni-Co-O nano-rod (NR) decorated Pd-activated cotton fibers (CFs) were fabricated using an eco-benign hydrothermal method and directly used as the cathode of the supercapacitors. Fe2O3-single-wall carbon nanotube (SWCNT) decorated CFs were employed as anodes of the fabricated ASCs. The assembled Ni-Co-O@cotton//Fe2O3-SWCNTs@cotton based ASCs possessed the benefits of a relatively high energy density of 16.3 W h kg(-1) at a reasonable power density of 600 W kg(-1) while showing remarkable cycling durability, retaining around 85% of their initial specific capacity after 4000 charge-discharge cycles. The capacitive performance of the fabricated Ni-Co-O@cotton//Fe2O3-SWCNTs@cotton based ASCs was preserved even if they were bent or folded. We believe that the fabricated ASCs are promising storage devices for practical applications in high-performance wearable electronics.