High Capacitance EDLC Using a Carbon Material Obtained by Carbonization of PVDC

Endo, Morinobu; Kim, Y. J.; Osawa, Kozo; Ishii, K.; Inoue, Tadashi; Nomura, Tsuyoshi; Miyashita, N.; Dresselhaus, M. S.

doi:10.1149/1.1530011

Cited by 26 publications

(7 citation statements)

References 11 publications

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“…For capacitor applications, activated carbons from different precursors and prepared by different activation processes have been widely used. [40][41][42][43][44][45][46][47][48][49][50] It can often be found in the literature that the higher the BET specific surface area, the higher the capacitance values. However, for a wide variety of activated carbons, this trend is not perfectly followed.…”

Section: Activated Carbons As Electrode Materialsmentioning

confidence: 99%

Carbon materials for supercapacitor application

Frąckowiak

2007

Phys. Chem. Chem. Phys.

1,859

1,127

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The most commonly used electrode materials for electrochemical capacitors are activated carbons, because they are commercially available and cheap, and they can be produced with large specific surface area. However, only the electrochemically available surface area is useful for charging the electrical double layer (EDL). The EDL formation is especially efficient in carbon pores of size below 1 nm because of the lack of space charge and a good attraction of ions along the pore walls. The pore size should ideally match the size of the ions. However, for good dynamic charge propagation, some small mesopores are useful. An asymmetric configuration, where the positive and negative electrodes are constructed from different materials, e.g., activated carbon, transition metal oxide or conducting polymer, is of great interest because of an important extension of the operating voltage. In such a case, the energy as well as power is greatly increased. It appears that nanotubes are a perfect conducting additive and/or support for materials with pseudocapacitance properties, e.g. MnO(2), conducting polymers. Substitutional heteroatoms in the carbon network (nitrogen, oxygen) are a promising way to enhance the capacitance. Carbons obtained by one-step pyrolysis of organic precursors rich in heteroatoms (nitrogen and/or oxygen) are very interesting, because they are denser than activated carbons. The application of a novel type of electrolyte with a broad voltage window (ionic liquids) is considered, but the stability of this new generation of electrolyte during long term cycling of capacitors is not yet confirmed.

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Section: Activated Carbons As Electrode Materialsmentioning

confidence: 99%

Carbon materials for supercapacitor application

Frąckowiak

2007

Phys. Chem. Chem. Phys.

1,859

1,127

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“…On the other hand, carbon materials with a high degree of porosity and high specific surface area are employed in the development of advanced energy storage systems such as electrochemical capacitors. − An electrical/electrochemical double layer capacitor (EDLC), also known as a “supercapacitor” or “ultracapacitor,” is a promising one, which is characterized by energy density in the range of 1–10 W h kg and a power density of 1–10 kW kg. These high parameters influence the replacement of the batteries as storage media by EDLC in many systems where traditional batteries are used (e.g., hybrid electric vehicles, power back-up systems, UPS, etc.).…”

Section: Introductionmentioning

confidence: 99%

Biowaste Sago Bark Based Catalyst Free Carbon Nanospheres: Waste to Wealth Approach

Hegde¹,

Manaf

Kumar

et al. 2015

ACS Sustainable Chem. Eng.

114

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Catalyst free carbon nanospheres were synthesized using simple one step pyrolysis techniques where biowaste sago bark is used as a carbon precursor. Obtained carbon nanospheres showed porous nature and revealed that more than 95% carbon is present in the synthesized carbon nanospheres with particle size ranging from 40-70 nm. Electrochemical study showed specific capacitance value of 180 Fg -1 at 2 mVs -1 and the cycling stability up to 1700 cycles. Obtained carbon nanospheres are useful in super capacitor applications. Presented study revealed waste to wealth approach thereby reducing waste in the environment.

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“…The crucial factor behind the high capacitance in EDCLs is the presence of a large electrode area. Carbonaceous materials have attracted increased interest as promising electrode material for supercapacitors due to their high surface area, highly porous nature, in addition to long cycle life and high power density [1][2][3][4][5]. There are various types of carbonaceous compounds used as electrodes for SCs (e.g., activated carbon, carbon black (CB), carbon fiber cloth, graphite powder, glassy carbon and carbon aerogel).…”

Section: Introductionmentioning

confidence: 99%

Nanostructured mesoporous carbon as electrodes for supercapacitors

Prabaharan

Raghavan²,

Zainal

2006

Journal of Power Sources

232

132

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Symmetrical carbon/carbon double layer capacitors (EDLCs) were fabricated employing nanostructured mesoporous nongraphitized carbon black (NMCB) powders and their EDLC behavior was studied using electrochemical techniques viz., cyclic voltammetry, a.c.-impedance, and constant current cycling. Rectangular shape cyclic characteristics were observed indicating the double layer behavior of the NMCB carbon electrodes. The mechanism of double layer formation and frequency dependent capacitance were deduced from the ac-impedance analysis. Specific capacitance, power density and energy density were derived from constant current charge/discharge measurements. NMCB powders demonstrated a specific capacitance of about ∼39 F g −1 and the power density of 782 W kg −1 at a current density of 32 mA cm −2 . Nevertheless, at a low current density (3 mA cm −2 ), the specific capacitance of ∼44 F g −1 was achieved, which corroborates with the values obtained by means of ac-impedance (40 F g −1 ) and cyclic voltammetry (41.5 F g −1 ). The test cells demonstrated the stable cycle performance over several hundreds of cycles.

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High Capacitance EDLC Using a Carbon Material Obtained by Carbonization of PVDC

Cited by 26 publications

References 11 publications

Carbon materials for supercapacitor application

Carbon materials for supercapacitor application

Biowaste Sago Bark Based Catalyst Free Carbon Nanospheres: Waste to Wealth Approach

Nanostructured mesoporous carbon as electrodes for supercapacitors

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