Uniaxially oriented carbon monoliths as supercapacitor electrodes

García-Gómez, Alejandra; Miles, Patrick D.; Centeno, Teresa A.; Rojo, J. M.

doi:10.1016/j.electacta.2010.07.072

Cited by 65 publications

(43 citation statements)

References 34 publications

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“…It is to be appreciated that the capacitance values from the impedance studies are comparable with those calculated from CV studies and this result thus supports the observation made by Garcia-Gomez et al [66] to corroborate the fact that the specific capacitance value evaluated from AC impedance studies would be comparable to that obtained from CV or charge-discharge studies provided the low frequency set in impedance studies, the sweep rate in CV studies and the current in charge-discharge studies are comparable enough. …”

Section: Datasupporting

confidence: 80%

On the (Pseudo) Capacitive Performance of Jack Fruit Seed Carbon

Kalyani¹,

Anitha²

2014

IJRET

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Section: Datasupporting

confidence: 80%

On the (Pseudo) Capacitive Performance of Jack Fruit Seed Carbon

Kalyani¹,

Anitha²

2014

IJRET

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“…faster charge/discharge of the cell) [6]. The effect of the three-dimensional character of the monolith on the electrical response of the cells has also been studied [21]. As the monolith height increases, (i) the cell capacitance increases significantly, which is an advantage, (ii) the cell resistance increases slightly, which is a moderate drawback, and (iii) the response time becomes longer, which is an important drawback.…”

Section: Introductionmentioning

confidence: 99%

“…As the monolith height increases, (i) the cell capacitance increases significantly, which is an advantage, (ii) the cell resistance increases slightly, which is a moderate drawback, and (iii) the response time becomes longer, which is an important drawback. So, thicker monoliths are better for improving cell energy and thinner monoliths are better for improving cell power [21,22].…”

Section: Introductionmentioning

confidence: 99%

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The contribution of sulfate ions and protons to the specific capacitance of microporous carbon monoliths

Barranco

García-Gómez

Kunowsky

et al. 2014

Journal of Power Sources

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The monoliths studied in this work show large specific surface areas (up to 1600 m 2 g -1 ), high densities (up to 1.17 g cm -3) and high electrical conductivities (up to 9.5 S cm -1 ). They are microporous carbons with pore sizes up to 1.3 nm but most of them below 0.75 nm. They also show oxygen functionalities. The electrochemical behavior of the monoliths is studied in three-electrode cells with aqueous H 2 SO 4 solution as electrolyte. This work deals with the contribution of the sulfate ions and protons to the specific capacitance of carbon monoliths having different surface areas and different contents of oxygen groups. Protons contribute with a pseudocapacitance (up to 152 F g ); both capacitances increase as the surface area increases. The preference of protons to be electroadsorbed at the double layer and the broader voltage window of these ions account for their higher contribution (70 %) to the double layer capacitance.

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“…Higher potential can be controlled by modifying the electrolyte properties, 12,13 while a lower ESR value can be achieved by reducing the internal resistance of the electrode and the contact resistance between the electrodes and the current collectors. 9 It has been observed that supercapacitors with low ESR values can be fabricated by modifying aluminium current collectors with carbon material via sol-gel and coating, 11 modifying aluminium current [15][16][17][18][19][20][21][22][23][24][25][26] Studies on the modification of separators have also been reported elsewhere. 27,28 Recently, the low ESR value has been achieved by modifying the SS current collector by the deposition of platinum nanoparticles, wherein the modified current collector was tested in supercapacitor cell fabricated with activated carbon monolith (ACM) electrode derived from rubber wood saw dust.…”

Section: Introductionmentioning

confidence: 99%

A New Approach towards Improving the Specific Energy and Specific Power of a Carbon-Based Supercapacitor using Platinum-Nanoparticles on Etched Stainless Steel Current Collector

et al. 2015

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We report an improved performance of a carbon-based supercapacitor using etched stainless steel (SS) current collector deposited with platinum nanoparticles (PtNs) over bare SS current collector/un-etched SS current collector deposited with PtNs. The PtNs grown on the etched surface of the current collectors provides a better contact with the surface of activated carbon monoliths electrode prepared from pre-carbonized fibres of oil palm empty fruit bunches. X-ray diffraction, field-emission scanning electron microscopy, the energy dispersive X-ray analysis, and X-ray photoelectron spectroscopy were employed to investigate the different properties of bare SS current collector and the modified current collector. Electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge-discharge results consistently suggest that the deposition of PtNs on the etched surface of the current collector causes an increase in specific capacitance of 10% (from 105 to 115 F g −1 ), 4% (from 141 to 146 F g −1) and 6% (from 142 to 150 F g −1 ) respectively. Correspondingly, the specific energy increases from 4.12 to 4.51 Wh kg −1 and specific power from 173 to 196 W kg −1 . Also EIS and GCD results respectively show a decrease of 47% (from 1.332 to 0.710 Ω) and 44% (from 1.75 to 0.974 Ω) in equivalent series resistance.

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Uniaxially oriented carbon monoliths as supercapacitor electrodes

Cited by 65 publications

References 34 publications

On the (Pseudo) Capacitive Performance of Jack Fruit Seed Carbon

On the (Pseudo) Capacitive Performance of Jack Fruit Seed Carbon

The contribution of sulfate ions and protons to the specific capacitance of microporous carbon monoliths

A New Approach towards Improving the Specific Energy and Specific Power of a Carbon-Based Supercapacitor using Platinum-Nanoparticles on Etched Stainless Steel Current Collector

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