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 language | English |
|---|---|
| Pages (from-to) | 776-784 |
| Number of pages | 9 |
| Journal | Chemical Engineering Journal |
| Volume | 328 |
| DOIs | |
| Publication status | Published - 2017 Nov 15 |
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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 journal › Article
}
TY - JOUR
T1 - Carbon nanofibers decorated with FeOx nanoparticles as a flexible electrode material for symmetric supercapacitors
AU - Samuel, Edmund
AU - Joshi, Bhavana
AU - Jo, Hong Seok
AU - Kim, Yong Il
AU - An, Seongpil
AU - Swihart, Mark T.
AU - Yun, Je Moon
AU - Kim, Kwang Ho
AU - Yoon, Suk Goo
PY - 2017/11/15
Y1 - 2017/11/15
N2 - 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.
AB - 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.
KW - Binder free
KW - Carbon nanofiber
KW - Electrospinning
KW - FeO
KW - Supercapacitor
UR - http://www.scopus.com/inward/record.url?scp=85024872191&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85024872191&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2017.07.063
DO - 10.1016/j.cej.2017.07.063
M3 - Article
AN - SCOPUS:85024872191
VL - 328
SP - 776
EP - 784
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -