Capacitance limits of high surface area activated carbons for double layer capacitors

Barbieri, O. De; Hahn, Matthias; Herzog, Andreas; Kötz, R.

doi:10.1016/j.carbon.2005.01.001

Cited by 775 publications

(491 citation statements)

References 14 publications

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“…For example, Kötz et al [38,39] ascribed the gravimetric capacitance limitation observed for active carbons with BET-surface areas above 1000 m 2 g −1 to a space constriction for charge accommodation into the thin pore walls.…”

Section: Specific Capacitance At Low Current Densitymentioning

confidence: 99%

Performance of templated mesoporous carbons in supercapacitors

Sevilla

Álvarez

Centeno

et al. 2007

Electrochimica Acta

119

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By analogy with other types of carbons, templated mesoporous carbons (TMCs) can be used as supercapacitors. Their contribution arises essentially from the double layer capacity formed on their surface, which corresponds to 0.14 F m −2 in aqueous electrolytes such as H 2 SO 4 and KOH and 0.06 F m −2 for the aprotic medium (C 2 H 5 ) 4 NBF 4 in CH 3 CN. In the case of a series of 27 TMCs, it appears that the effective surface area determined by independent techniques can be as high as 1500-1600 m 2 g −1 , and therefore exceeds the value obtained for many activated carbons (typically 900-1300 m 2 g −1 ). On the other hand, the relatively low amount of surface oxygen in the present TMCs, as opposed to activated carbons, reduces the contribution of pseudo-capacitance effects and limits the gravimetric capacitance to 200-220 F g −1 for aqueous electrolytes. In the case of non-aqueous electrolyte, it rarely exceeds 100 F g −1 .It is also shown that the average mesopore diameter of these TMCs does not improve significantly the ionic mobility compared with typical activated carbons of pore-widths above 1.0-1.3 nm.This study suggests that activated carbons remain the more promising candidates for supercapacitors with high performances.

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Section: Specific Capacitance At Low Current Densitymentioning

confidence: 99%

Performance of templated mesoporous carbons in supercapacitors

Sevilla

Álvarez

Centeno

et al. 2007

Electrochimica Acta

119

View full text Add to dashboard Cite

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“…The finite ability of nanoporous carbons to screene lectric charges, however,p resentsa n upperc apacitance limit in this approach. [26] The energy performance of carbon onions can be significantly enhanced by introducing pseudocapacitivem aterials, but this is commonly at the cost of powerh andling. In this study, an ovel synergistic electrode preparation method was developed by using carbon-fiber substrates loaded with quinonedecorated carbon onions.T he electrodes are free standing, binder free, extremely conductive, and the interfiber space filling overcomest he severely low apparent density commonly found for electrospun fibers.…”

Section: Introductionmentioning

confidence: 99%

Quinone‐Decorated Onion‐Like Carbon/Carbon Fiber Hybrid Electrodes for High‐Rate Supercapacitor Applications

2015

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The energy performance of carbon onions can be significantly enhanced by introducing pseudocapacitive materials, but this is commonly at the cost of power handling. In this study, a novel synergistic electrode preparation method was developed by using carbon‐fiber substrates loaded with quinone‐decorated carbon onions. The electrodes are free standing, binder free, extremely conductive, and the interfiber space filling overcomes the severely low apparent density commonly found for electrospun fibers. Electrochemical measurements were performed in organic and aqueous electrolytes. For both systems, a high electrochemical stability after 10 000 cycles was measured, as well as a long‐term voltage floating test for the organic electrolyte. The capacitance in 1 M H2SO4 was 288 F g−1 for the highest loading of quinones, which is similar to literature values, but with a very high power handling, showing more than 100 F g−1 at a scan rate of 2 Vs−1.

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“…Generally, the higher the surface area of the carbon material accessible to the electrolyte ion, the higher capacitance value is obtained [9][10][11][12][13]. However, the capacitance becomes almost constant for carbons with BET surface area higher than 1800 m 2 g -1 [14,15].…”

Section: Introductionmentioning

confidence: 99%

Influence of structural and textural parameters of carbon nanofibers on their capacitive behavior

2015

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Herringbone, platelet, and tubular carbon nanofibers (CNFs) were synthesized by catalytic chemical vapor deposition using methane, propane, and ethylene as carbon precursors. Alumina-supported nickel and iron catalysts were used for the syntheses. The resultant CNFs were characterized by scanning electron microscopy, transmission electron microscopy, and nitrogen sorption at 77 K. The performance of a CNF-based supercapacitor working in 6 mol L -1 KOH was analyzed using cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy techniques. The Brunauer-Emmett-Teller (BET) surface area of the CNFs ranged between 150 and 296 m 2 g -1 . An increase in the CNF diameter was accompanied by a decrease in the BET surface area. A comparison of the porous textures and the structure types of the CNFs demonstrated that the performance of the CNF-based supercapacitor is enhanced primarily by the exposed edges of the graphitic layers on the CNF surface, followed by the specific surface area. Among the studied CNFs, the highest capacitance value, 26 F g -1 at 0.2 A g -1 , was obtained for the platelet-type CNFs.Tubular CNFs exhibited the lowest capacitance value, which increased from 4 to 33 F g -1 at 0.2 A g -1 upon air treatment at 450°C. The presence of exposed graphitic edges on the air-treated CNT surface and an increase in the specific surface area are considered to be responsible for the enhancement of the capacitor performance.

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Capacitance limits of high surface area activated carbons for double layer capacitors

Cited by 775 publications

References 14 publications

Performance of templated mesoporous carbons in supercapacitors

Performance of templated mesoporous carbons in supercapacitors

Quinone‐Decorated Onion‐Like Carbon/Carbon Fiber Hybrid Electrodes for High‐Rate Supercapacitor Applications

Influence of structural and textural parameters of carbon nanofibers on their capacitive behavior

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