Carbon nanofibers decorated with FeOx nanoparticles as a flexible electrode material for symmetric supercapacitors

Edmund Samuel, Bhavana Joshi, Hong Seok Jo, Yong Il Kim, Seongpil An, Mark T. Swihart, Je Moon Yun, Kwang Ho Kim, Suk Goo Yoon

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We have produced flexible, freestanding, and light weight mats of FeOx-decorated carbon nanofibers (CNFs) and demonstrated their use in supercapacitors with high energy and power density and excellent long term capacitance retention. Highly flexible carbon-iron oxide nanofibers were synthesized by electrospinning a solution of polyacrylonitrile (PAN), polymethylmethacrylate (PMMA), and iron acetylacetonate (FeAcAc), followed by annealing to carbonize the PAN, pyrolyze the PMMA to produce pores, and convert FeAcAc to FeO nanoparticles. The morphology of the FeOx/CNF composite was determined by scanning and transmission electron microscopies, which showed that the embedded FeOx nanoparticles were well distributed in the CNF electrode. We employed cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy to evaluate the electrochemical performance of symmetric supercapacitors prepared from the FeOx/CNF composite. The supercapacitors exhibited high specific capacitance (427 F·g−1 at 10 mV·s−1 and 436 F·g−1 at 1 A·g−1 in the optimal case) and good stability, retaining 89% of their initial capacitance after 5000 cycles at a current density of 1 A·g−1. The optimal device achieved an energy density of 167 Wh·kg−1 at a power density of 0.75 kW·kg−1, and an energy density of 66 Wh·kg−1 at a power density of 7.5 kW·kg−1. These combinations of energy and power densities can meet the needs of many emerging supercapacitor applications.

Original languageEnglish
Pages (from-to)776-784
Number of pages9
JournalChemical Engineering Journal
Volume328
DOIs
Publication statusPublished - 2017 Nov 15

Fingerprint

Carbon nanofibers
electrode
Nanoparticles
Electrodes
Capacitance
Polyacrylonitriles
carbon
Polymethyl Methacrylate
Composite materials
Electrospinning
Nanofibers
energy
Electrochemical impedance spectroscopy
Iron oxides
Cyclic voltammetry
Current density
Carbon
Iron
Annealing
Transmission electron microscopy

Keywords

  • Binder free
  • Carbon nanofiber
  • Electrospinning
  • FeO
  • Supercapacitor

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Carbon nanofibers decorated with FeOx nanoparticles as a flexible electrode material for symmetric supercapacitors. / Samuel, Edmund; Joshi, Bhavana; Jo, Hong Seok; Kim, Yong Il; An, Seongpil; Swihart, Mark T.; Yun, Je Moon; Kim, Kwang Ho; Yoon, Suk Goo.

In: Chemical Engineering Journal, Vol. 328, 15.11.2017, p. 776-784.

Research output: Contribution to journalArticle

Samuel, Edmund ; Joshi, Bhavana ; Jo, Hong Seok ; Kim, Yong Il ; An, Seongpil ; Swihart, Mark T. ; Yun, Je Moon ; Kim, Kwang Ho ; Yoon, Suk Goo. / Carbon nanofibers decorated with FeOx nanoparticles as a flexible electrode material for symmetric supercapacitors. In: Chemical Engineering Journal. 2017 ; Vol. 328. pp. 776-784.
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abstract = "We have produced flexible, freestanding, and light weight mats of FeOx-decorated carbon nanofibers (CNFs) and demonstrated their use in supercapacitors with high energy and power density and excellent long term capacitance retention. Highly flexible carbon-iron oxide nanofibers were synthesized by electrospinning a solution of polyacrylonitrile (PAN), polymethylmethacrylate (PMMA), and iron acetylacetonate (FeAcAc), followed by annealing to carbonize the PAN, pyrolyze the PMMA to produce pores, and convert FeAcAc to FeO nanoparticles. The morphology of the FeOx/CNF composite was determined by scanning and transmission electron microscopies, which showed that the embedded FeOx nanoparticles were well distributed in the CNF electrode. We employed cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy to evaluate the electrochemical performance of symmetric supercapacitors prepared from the FeOx/CNF composite. The supercapacitors exhibited high specific capacitance (427 F·g−1 at 10 mV·s−1 and 436 F·g−1 at 1 A·g−1 in the optimal case) and good stability, retaining 89{\%} of their initial capacitance after 5000 cycles at a current density of 1 A·g−1. The optimal device achieved an energy density of 167 Wh·kg−1 at a power density of 0.75 kW·kg−1, and an energy density of 66 Wh·kg−1 at a power density of 7.5 kW·kg−1. These combinations of energy and power densities can meet the needs of many emerging supercapacitor applications.",
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