2024 - Sustainable Industrial Processing Summit
SIPS 2024 Volume 14. Intl. Symp on Advanced Materials, Manufacturing, Magnesium and Aluminum
| Editors: | F. Kongoli, F. Marquis, N. Chikhradze, T. Prikhna, E. Suhir, Y. Yang |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2024 |
| Pages: | 258 pages |
| ISBN: | 978-1-998384-30-3 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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TUNABLE PSEUDOCAPACITANCE OF ELECTROSPUN CARBON/IRON–VANADIUM OXIDE NANOFIBERS FOR HIGH-ENERGY-DENSITY FLEXIBLE SUPERCAPACITORS
Jiwon Jang1;1KOREA UNIVERSITY, Seoul, South Korea;
Type of Paper: Regular
Id Paper: 413
Topic: 43
Abstract:
Highly flexible and conductive carbon nanofibers (CNFs) embedded with pseudocapacitive iron–vanadium oxide (FVO) were fabricated via electrospinning followed by high-temperature annealing (900 °C). CNFs have a graphitic structure with minimal defects, which could hinder the access of electrolytic ions to multivalent FVO. Therefore, a sacrificial polymer, such as poly(methyl methacrylate) (PMMA), was introduced to enhance the electrolytic ion pathways by altering the internal structure of nanofiber. In addition, terephthalic acid was added to a polyacrylonitrile–PMMA solution to facilitate flexibility by increasing the cross-linking of the electrospun fibers. The fabricated flexible FVO/CNFs exhibited significantly enhanced electrochemical performance. The optimal sample had a high areal capacitance of 1058 mF·cm−2 at a current density of 2.5 mA·cm-2 and showed 100% capacitance retention during long-term cycling (10,000 cycles). The capacitance retention decreased to 81.3% when the current density was increased to 25 mA·cm-2. The wider potential window of 0–1.6 V increased the energy density to 389 µW·h·cm-2. The optimal FVO/CNF sample maintained 90% capacitance retention after 200 bending cycles.