Physical and electrochemical characteristics of supercapacitors based on carbide derived carbon electrodes in aqueous electrolytes

Eskusson, Jaanus; Jänes, Alar; Kikas, Arvo; Matisen, Leonard; Lust, Enn

doi:10.1016/j.jpowsour.2010.10.100

Cited by 100 publications

(56 citation statements)

References 29 publications

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“…The specific energy of our UCap varied from the initial 17.5 Wh kg À1 to 16.1 Wh kg À1 after 20000 cycles. Eskusson [24] recently reported specific energy of 5.7 Wh kg À1 in a 6 M KOH aqueous UCap. Thus our values are about twice than those reported in literature for similar laboratory UCaps.…”

Section: Resultsmentioning

confidence: 99%

High energy ultracapacitor based on carbon xerogel electrodes and sodium sulfate electrolyte

Staiti

Arenillas

Lufrano

et al. 2012

Journal of Power Sources

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Section: Resultsmentioning

confidence: 99%

High energy ultracapacitor based on carbon xerogel electrodes and sodium sulfate electrolyte

Staiti

Arenillas

Lufrano

et al. 2012

Journal of Power Sources

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“…Scientists all around the world are faced with a great challenge of obtaining a system with high capacitance resulting in the higher energy of supercapacitors. The increase in capacitance can be reached by additional quick faradaic reactions, commonly known as pseudocapacitive effects [15][16][17][18][19][20][21][22][23]. In this case, pseudocapacitive effect and doublelayer capacitance both form the total capacitance of an electrochemical capacitor.…”

Section: Introductionmentioning

confidence: 99%

The application of activated carbon modified by ozone treatment for energy storage

Lota

Krawczyk

Lota

et al. 2016

J Solid State Electrochem

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Activated carbon modified by ozone treatment was examined. The process was carried out in a glass reactor under a continuous flow of ozone through a bed of activated carbon for 15, 30, 60, 120, and 240 min. The modified and unmodified carbon materials were characterized by Raman spectroscopy and observed by scanning electron microscopy (SEM). Thermogravimetric analysis was used to estimate the presence of oxygen groups in the carbon structure. The surface area and pore size distribution were examined by nitrogen adsorption method at 77 K. Moreover, Fourier transform infrared (FTIR) spectroscopy was used to estimate the functional groups of modified activated carbon. The carbon content was estimated using the elemental analysis. The process of ozonation increases oxygen functionalities, thus the activated carbon was tested as electrodes for an electrochemical capacitor. The performance of an electrochemical capacitor was estimated by selected alternating (AC) and direct current (DC) methods in 1 M H 2 SO 4 , 1 M Na 2 SO 4 , and 6 M KOH electrolytes.

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“…1,43,44 Among microporous carbons, advanced activated carbons (AC) 1,[44][45][46][47][48][49][50] and carbide derived carbons (CDC) 8,[51][52][53][54][55][56][57] have been investigated the most. At the same time, microporous zeolite templatedcarbons (ZTCs) pioneered by Kyotani et al received significantly smaller attention.…”

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confidence: 99%

Increasing Capacitance of Zeolite-Templated Carbons in Electric Double Layer Capacitors

Moon

Kim

Lee

et al. 2015

J. Electrochem. Soc.

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Enhancement of the specific capacitance in electrochemical double layer capacitors (EDLCs) is of high interest due to the ever increasing demand for high power density energy storage devices. Zeolite templated carbon (ZTC) is a promising EDLC electrode material with large specific surface area and straight, ordered well-defined micropores. In this study, ZTC samples were synthesized using a low pressure chemical vapor deposition (LP CVD) of carbon on sacrificial zeolite Y powder using acetylene gas as a precursor. We demonstrate for the first time how various post-treatments of the produced samples can affect the ZTC microstructure and porosity and how such modifications may significantly improve electrochemical performance characteristics of the ZTC-based EDLC electrodes. The effects of CO 2 activation, ball milling and high temperature annealing process were systematically studied. The best performing samples achieved very large capacitance of over 240 Fg −1 at 1 mVs −1 in 1 M solution of tetraethylammonium tetrafluoroborate in acetonitrile and stable performance in symmetric EDLC devices with no noticeable degradation for over 20,000 cycles at a very high current density of 20 Ag Electrochemical double layer capacitors (EDLCs), also called supercapacitors and ultra-capacitors, have attracted extensive attention as EDLCs can provide high power delivery or update, high cycle efficiency, thermal stability, practically unlimited cycle life and relatively low cost of manufacturing.1 Furthermore, a wide operational temperature range and a relatively easy determination of the state of charge can be considered as additional advantageous aspects.1 Hence, there is an increasing growth in demand for EDLCs in industrial equipments, electronic devices, transportation market, and automotive applications.1-5 Yet, significantly smaller energy density (ca. 5 Wh kg −1 ) compared to the state of art rechargeable Li ion batteries (ca. 180 Wh kg −1 ) urgently calls for improvement in capacitance of EDLCs. 6,7 In addition, for some applications it is crucial to further increase the charge-discharge rate capability without deteriorating energy density characteristics. 1The value of the double layer capacitance formed at the electrode/ electrolyte interface (which directly impacts the energy density of EDLCs) is believed to depend on multiple factors, such as specific surface area (SSA) of the electrically conductive porous carbon electrodes, 1,8-11 pore size distribution (PSD) of the carbon electrodes (which may affect both the pore access by electrolyte ions and the solvation shell distortion and the resulting pore wall -ion separation distance), 1,3,9,12 electron density of states in carbon (which may affect the capacitance of the electrode side of the double layer), 13 electrolyte-carbon interfacial energy (which may affect electrolyte wetting in both large and sub-nm sized pores), 14,15 electrolyte-carbon interactions (which may impact electron density of states in carbon), 16 the presence of doping species within carbon (which...

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Physical and electrochemical characteristics of supercapacitors based on carbide derived carbon electrodes in aqueous electrolytes

Cited by 100 publications

References 29 publications

High energy ultracapacitor based on carbon xerogel electrodes and sodium sulfate electrolyte

High energy ultracapacitor based on carbon xerogel electrodes and sodium sulfate electrolyte

The application of activated carbon modified by ozone treatment for energy storage

Increasing Capacitance of Zeolite-Templated Carbons in Electric Double Layer Capacitors

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