Iron Sulfide Microspheres Supported on Cellulose-Carbon Nanotube Conductive Flexible Film as an Electrode Material for Aqueous-Based Symmetric Supercapacitors with High Voltage
Jincy Parayangattil Jyothibasu, You-Ching Tien, Zi-Ting Chen, Hongta Yang, Tzu Hsuan Chiang, Ahmed F. M. EL-Mahdy, Rong-Ho Lee
TL;DR
A new composite electrode material made of iron sulfide and cellulose-carbon nanotube films shows excellent performance in supercapacitors with high voltage and durability.
Contribution
A novel composite electrode material combining FeS2 microspheres with a cellulose-CNT conductive film is developed for high-voltage symmetric supercapacitors.
Findings
The RC/CNT/FeS2/PPy composite electrode achieved an areal capacitance of 6543.8 mF cm–2 at 1 mA cm–2.
The electrode retained 91.1% of its capacitance after 10,000 charge/discharge cycles.
A symmetric supercapacitor using this electrode delivered a maximum energy density of 329 μWh cm–2 and 86.2% capacitance retention after 10,000 cycles.
Abstract
Nanostructured iron disulfide (FeS2) was uniformly deposited on regenerated cellulose (RC) and oxidized carbon nanotube (CNT)-based composite films using a simple chemical bath deposition method to form RC/CNT/FeS2 composite films. The RC/CNT composite film served as an ideal substrate for the homogeneous deposition of FeS2 microspheres due to its unique porous architecture, large specific surface area, and high conductivity. Polypyrrole (PPy), a conductive polymer, was coated on the RC/CNT/FeS2 composite to improve its conductivity and cycling stability. Due to the synergistic effect of FeS2 with high redox activity and PPy with high stability and conductivity, the RC/CNT/FeS2/PPy composite electrode exhibited excellent electrochemical performance. The RC/CNT/0.3FeS2/PPy-60 composite electrode tested with Na2SO4 aqueous electrolyte could achieve an excellent areal capacitance of 6543.8…
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Taxonomy
TopicsSupercapacitor Materials and Fabrication · Membrane-based Ion Separation Techniques · Microbial Fuel Cells and Bioremediation