Effects of thermal treatments on the supercapacitive performances of PAN-based carbon fiber electrodes

Hu, J.L.; Huang, Jinhua; Chih, Ya-Ko; Chuang, Chiashain; Chen, J.P.; Cheng, Shihua; Horng, J.L.

doi:10.1016/j.diamond.2008.10.025

Cited by 19 publications

(5 citation statements)

References 20 publications

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“…g . CO, CO 2 , H 2 O, and so on) when thermally treated at temperatures >700°C in an inert gas, which reduced the average diameter and induced the porous structure …”

Section: Resultsmentioning

confidence: 99%

Effects of Heat Treatment on the Hierarchical Porous Structure and Electro‐Capacitive Properties of RuO₂/Activated Carbon Nanofiber Composites

Jun

Kim

2016

Bulletin Korean Chem Soc

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Electrochemical capacitors based on hierarchical porous activated carbon nanofiber (RuO 2 /ACNF) composites are fabricated by one-step electrospinning, and then stabilized at different activation temperatures. The effect of the activation temperature on the structural properties and electrochemical behavior of the RuO 2 /ACNF composites is intensively investigated in 6 M KOH electrolyte. The RuO 2 /ACNF-800 composites activated at high temperature possess abundant mesopores and larger pores, which improve the electrochemical performance, especially at high charge-discharge rates. The energy storage capabilities of the RuO 2 /ACNF-800 electrode prepared at high temperature are as follows: a maximum specific capacitance of 150 F/g and an energy density of 14-20 Wh/kg in the respective power density range of 400 to 10 000 W/kg in an aqueous solution. Furthermore, this electrode exhibits high-rate electrochemical performance with a specific capacitance reduction of less than 28% of the initial value at a discharge current of 20 mA/cm 2 . Therefore, the hierarchical porous RuO 2 /ACNF composites with well-developed mesoporous structure provide low resistance for charge diffusion and a short pathway for ion transportation, yielding good capacitive behavior.

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“…g . CO, CO 2 , H 2 O, and so on) when thermally treated at temperatures >700°C in an inert gas, which reduced the average diameter and induced the porous structure …”

Section: Resultsmentioning

confidence: 99%

Effects of Heat Treatment on the Hierarchical Porous Structure and Electro‐Capacitive Properties of RuO₂/Activated Carbon Nanofiber Composites

Jun

Kim

2016

Bulletin Korean Chem Soc

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“…Earlier reports have shown that the structural and electrical properties of PAN‐based CFs could be improved by oxidative stabilization treatments . Thermal treatments were performed on PAN‐cased CFs to enhance their supercapacitive performances . However, there is less in depth studies reported which could reveal the effect of surface treatments on various properties of PAN‐based CFs, such as surface characteristics, mechanical properties, and electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and Mechanical Effects of Acid and Thermal Treatments of Carbon Fiber

Zhao

Zhang³

et al. 2014

Adv Eng Mater

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This paper presents modification method toward preparing activated structural carbon fibers (CFs) possessing both good electrochemical and mechanical properties. The surface treatment of CFs has been carried out by chemical and chemical-thermal oxidation, and supercapacitors have been fabricated with CF electrodes. Effects of surface treatment on fiber surface characteristics, mechanical properties, and electrochemical performances were investigated. Results show that proper treatment of CF by chemical-thermal oxidation provides an effective way to enlarge the fiber surface area (increase around 45-fold), strengthen fiber surface chemical activity, and fiber tensile strength (increase around 20%) as well as its energy storing ability (increase around 129-fold). Fig. 4. Charge-discharge curves of supercapacitors. (a) Supercapacitor based on unmodified carbon fiber electrodes (charge-discharge current: 0.1 mA). (b) Supercapacitor based on ACF electrodes (charge-discharge current: 0.5 mA).

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“…Figure 9b shows the typical charge-discharge profiles of the CF and ACFs electrodes in the organic electrolyte. Notably, the carbon fibers without activation (CF) present the lower capacitance (18 F g -1 ) than ACF-CO 2 and ACF-KOH-900 (63 and 116 F g -1 , respectively), indicating that the activation process favors the formation and dispersion of pores on the surface of the activated carbon fibers, which increases the specific surface areas and subsequently improves the specific capacitances [22]. The capacitor using ACF-KOH-900 electrodes shows near triangular charge/discharge curves, reflecting its excellent charge/ discharge capacitive performance.…”

Section: Electrochemical Performance In An Organic Electrolytementioning

confidence: 99%

Effect of activation on the carbon fibers from phenol–formaldehyde resins for electrochemical supercapacitors

et al. 2011

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Activated carbon fibers (ACF) are prepared from phenol-formaldehyde resin fibers through chemical activation and physical activation methods. The chemical activation process consisted of KOH, whereas the physical activation was performed by activation in CO 2 . The characteristics of the electrochemical supercapacitors with carbon fibers without activation (CF), carbon fibers activated by CO 2 (ACF-CO 2 ), and carbon fibers activated by KOH (ACF-KOH) have been compared. The activated carbon fibers from phenol-formaldehyde resins present a broader potential range in aqueous electrolytes than activated carbon and other carbon fibers. Activation does not produce any important change in the shape of starting fibers. However, activation leads to surface roughness and larger surface areas as well as an adapted pore size distribution. The higher surface areas of fibers treated by KOH exhibited higher specific capacitances (214 and 116 F g -1 in aqueous and organic electrolytes, respectively) and good rate capability. Results of this study suggest that the activated carbon fiber prepared by chemical activation is a suitable electrode material for high performance electrochemical supercapacitors.

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Effects of thermal treatments on the supercapacitive performances of PAN-based carbon fiber electrodes

Cited by 19 publications

References 20 publications

Effects of Heat Treatment on the Hierarchical Porous Structure and Electro‐Capacitive Properties of RuO₂/Activated Carbon Nanofiber Composites

Effects of Heat Treatment on the Hierarchical Porous Structure and Electro‐Capacitive Properties of RuO₂/Activated Carbon Nanofiber Composites

Electrochemical and Mechanical Effects of Acid and Thermal Treatments of Carbon Fiber

Effect of activation on the carbon fibers from phenol–formaldehyde resins for electrochemical supercapacitors

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Effects of thermal treatments on the supercapacitive performances of PAN-based carbon fiber electrodes

Cited by 19 publications

References 20 publications

Effects of Heat Treatment on the Hierarchical Porous Structure and Electro‐Capacitive Properties of RuO2/Activated Carbon Nanofiber Composites

Effects of Heat Treatment on the Hierarchical Porous Structure and Electro‐Capacitive Properties of RuO2/Activated Carbon Nanofiber Composites

Electrochemical and Mechanical Effects of Acid and Thermal Treatments of Carbon Fiber

Effect of activation on the carbon fibers from phenol–formaldehyde resins for electrochemical supercapacitors

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Product

Resources

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Effects of Heat Treatment on the Hierarchical Porous Structure and Electro‐Capacitive Properties of RuO₂/Activated Carbon Nanofiber Composites

Effects of Heat Treatment on the Hierarchical Porous Structure and Electro‐Capacitive Properties of RuO₂/Activated Carbon Nanofiber Composites