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, Sam S.
N1 - Funding Information:
This research was supported by Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2013M3A6B1078879). This research was supported by the Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning (2016M1A2A2936760) and NRF-2017R1A2B4005639.
Publisher Copyright:
© 2017 Elsevier B.V.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017
Y1 - 2017
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
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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 -