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RuO2 Nanorods on Electrospun Carbon Nanofibers for Supercapacitors

Title
RuO2 Nanorods on Electrospun Carbon Nanofibers for Supercapacitors
Authors
Jeon, SohyunJeong, Ji HwanYoo, HyominYu, Hak KiKim, Bo-HyeKim, Myung Hwa
Ewha Authors
김명화
SCOPUS Author ID
김명화scopus
Issue Date
2020
Journal Title
ACS APPLIED NANO MATERIALS
ISSN
2574-0970JCR Link
Citation
ACS APPLIED NANO MATERIALS vol. 3, no. 4, pp. 3847 - 3858
Keywords
recrystallization temperaturemicrostructurecrystal phase of RuO2electrospun carbon nano fibersupercapacitor
Publisher
AMER CHEMICAL SOC
Indexed
SCOPUS WOS
Document Type
Article
Abstract
RuO2 nanorods on electrospun carbon nanofibers were simply grown by precipitation and recrystallization methods for studying their capacitive behaviors for supercapacitor applications. Recrystallization by heat treatment is carefully performed at various temperatures: 180, 220, and 300 degrees C. Under optimal growth conditions, application of RuO2-carbon nanofibers annealed at 220 degrees C with a very low loading concentration of Ru as the electrode material in a KOH aqueous electrolyte leads to a good capacitance capability of 188 F g(-1) at a current density of 1 mA cm(-2) and a high energy density of 22-15 W h kg(-1) in the power density range of 400-4000 W kg(-1) for supercapacitor applications. The capacitance of RuO2 -carbon nanofibers after 3000 cycles also maintains approximately 93% of its initial value at a discharge current density of 1 mA cm(-2). The excellent electrochemical performance of RuO2 -carbon nanofibers is mainly attributed to their large surface area with many mesopores as well as their electroactive functional sites, which have the appropriate degree of crystallinity. Therefore, a larger mesopore volume and low-dimensional RuO2 nanorods on carbon nanofibers are beneficial for low internal resistance, leading to ion charge diffusion and charge storage in the bulk of amorphous material.
DOI
10.1021/acsanm.0c00579
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자연과학대학 > 화학·나노과학전공 > Journal papers
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