RuO2 Nanorods on Electrospun Carbon Nanofibers for Supercapacitors
- 주제(키워드) recrystallization temperature , microstructure , crystal phase of RuO2 , electrospun carbon nano fiber , supercapacitor
- 주제(기타) Nanoscience & Nanotechnology
- 주제(기타) Materials Science, Multidisciplinary
- 설명문(일반) [Jeon, Sohyun; Yoo, Hyomin; Kim, Myung Hwa] Ewha Womans Univ, Dept Chem & Nanosci, Seoul 13760, South Korea; [Jeong, Ji Hwan; Kim, Bo-Hye] Daegu Univ, Dept Sci Educ, Chem Educ Major, Gyongsan 712714, Gyeongsangbuk D, South Korea; [Yu, Hak Ki] Ajou Univ, Dept Mat Sci & Engn, Suwon 16499, South Korea; [Yu, Hak Ki] Ajou Univ, Dept Energy Syst Res, Suwon 16499, South Korea
- 등재 SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2020
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000169537
- 본문언어 영어
- Published As https://dx.doi.org/10.1021/acsanm.0c00579
초록/요약
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.
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