Novel Binder-Free Electrode Materials for Supercapacitors Utilizing High Surface Area Carbon Nanofibers Derived from Immiscible Polymer Blends of PBI/6FDA-DAM:DABA

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Novel Binder-Free Electrode Materials for Supercapacitors Utilizing High Surface Area Carbon Nanofibers Derived from Immiscible Polymer Blends of PBI/6FDA-DAM:DABA

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Title: Novel Binder-Free Electrode Materials for Supercapacitors Utilizing High Surface Area Carbon Nanofibers Derived from Immiscible Polymer Blends of PBI/6FDA-DAM:DABA
Author(s):
Abeykoon, Nimali C.;
Garcia, Velia;
Jayawickramage, Rangana A.;
Perera, Wijayantha;
Cure, Jeremy;
Chabal, Yves J.;
Balkus, Kenneth J.;
Ferraris, John P.
Date Created: 2017-04-12
Item Type: article
Keywords: Show Keywords
Abstract: Carbon nanofibers with high surface area have become promising electrode materials for supercapacitors because of their importance in increasing energy density. In this study, a high free volume polymer, 6FDA-DAM:DABA (6FDD) was blended with polybenzimidazole (PBI) in different ratios to obtain different compositions of PBI/6FDD immiscible polymer blends. Freestanding nanofiber mats were obtained via electrospinning using blend precursors dissolved in N,N-dimethylacetamide (DMAc). Subsequently, carbonization, followed by CO₂ activation at 1000 °C was applied to convert the fiber mats into porous carbon nanofibers (CNFs). The addition of 6FDD shows significant effects on the microstructure and enhancement of the surface area of the CNFs. The obtained CNFs show specific surface area as high as 3010 m² g⁻¹ with pore sizes comparable to those of the electrolyte ions (PYR₁₄TFSI). This provides good electrolyte accessibility to the pore of the carbon materials resulting in enhanced energy density compared to the CNFs obtained from pure PBI. Electrodes derived from PBI:6FDD (70 : 30) exhibited outstanding supercapacitor performance in coin cells with a specific capacitance of 142 F g⁻¹ at the scan rate of 10 mV s⁻¹ and energy density of 67.5 W h kg⁻¹ at 1 A g⁻¹ (58 W h kg⁻¹ at 10 A g⁻¹) thus demonstrating promising electrochemical performance for high performance energy storage system.
Publisher: Royal Society of Chemistry
ISSN: 2046-2069
Source: RSC Advances
Link to Related Resource: http://dx.doi.org/10.1039/C7RA01727H
Persistent Link: http://hdl.handle.net/10735.1/5815
Bibliographic Citation: Abeykoon, N. C., V. Garcia, R. A. Jayawickramage, W. Perera, et al. 2017. "Novel binder-free electrode materials for supercapacitors utilizing high surface area carbon nanofibers derived from immiscible polymer blends of PBI/6FDA-DAM:DABA." RSC Advances 7(34), doi:10.1039/C7RA01727H
Terms of Use: CC BY-NC 3.0 (Attribution-NonCommercial)
©2017 The Royal Society of Chemistry
Sponsors: National Science Foundation grants (IIP-1127564, CHE-1126177)

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CC BY-NC 3.0 (Attribution-NonCommercial) Except where otherwise noted, this item's license is described as CC BY-NC 3.0 (Attribution-NonCommercial)