Capacitance behavior of KOH activated mesocarbon microbeads in different aqueous electrolytes

Torchała, Kamila; Kierzek, Krzysztof; Machnikowski, J.

doi:10.1016/j.electacta.2012.07.062

Cited by 97 publications

(44 citation statements)

References 28 publications

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“…The activated carbon (AC) has been a good electrode material for EDLC because it is a porous material having high specific surface area (SSA) and proper pore size distribution (PSD). To prepare high quality of ACs, chemical activation by KOH has been focused because it has advantages of high SSA and high capacitance as an electrode material for EDLC [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization and organic electric-double-layer-capacitor application of KOH activated coal-tar-pitch-based carbons: Effect of carbonization temperature

Choi

Lee

Kwon

et al. 2015

Journal of Physics and Chemistry of Solids

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Section: Introductionmentioning

confidence: 99%

“…There have been many studies about activation of CTP [9,10], meso-carbon microbeads (MCMB) derived from CTP [8,[11][12][13][14][15], and needle cokes derived from CTP [16].…”

Section: Introductionmentioning

confidence: 99%

Characterization and organic electric-double-layer-capacitor application of KOH activated coal-tar-pitch-based carbons: Effect of carbonization temperature

Choi

Lee

Kwon

et al. 2015

Journal of Physics and Chemistry of Solids

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“…This allows for more ions to be available to adsorb on the charged carbon surface, without depleting the electrolyte of ions. It has been hypothesized that higher pore volume associated with mesopores should improve ion transport in the carbon structure, resulting in higher capacitance, especially at fast charging rates [24,39,40]. However, the results presented in Fig.…”

Section: Discussionmentioning

confidence: 67%

“…It is hypothesized that mesopores improve ion transport at faster charging rates, allowing for greater capacitance. Mesopores also result in a larger volume of electrolyte within the carbon electrode structure, which allows the applied surface charge to be matched by adsorbed ions without causing ion depletion in the electrolyte [24,39,40]. However, a limitation of these all studies was variation in specific surface area of the carbon electrode materials, which is known to affect the value of the materials' gravimetric and volumetric capacitances.…”

Section: Introductionmentioning

confidence: 95%

Isolating the effect of pore size distribution on electrochemical double-layer capacitance using activated fluid coke

Zuliani

Tong

Kirk

et al. 2015

Journal of Power Sources

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“…have been used as raw electrode materials [4][5][6][7][8], coal tar pitch (CTP) has been of interest as a precursor for EDLC electrode material because the AC produced from it has high a SSA and high activation yield. There have been many studies about the activation of CTP, CTP derived meso-carbon microbeads, and needle cokes [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Activated carbons prepared from mixtures of coal tar pitch and petroleum pitch and their electrochemical performance as electrode materials for electric double-layer capacitor

Lee¹,

Kwon²,

Choi³

et al. 2015

Carbon letters

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Activated carbons (ACs) were prepared by activation of coal tar pitch (CTP) in the range of 700°C-1000°C for 1-4 h using potassium hydroxide (KOH) powder as the activation agent. The optimal activation conditions were determined to be a CTP/KOH ratio of 1:4, activation temperature of 900°C, and activation time of 3 h. The obtained ACs showed increased pore size distribution in the range of 1 to 2 nm and the highest specific capacitance of 122 F/g in a two-electrode system with an organic electrolyte, as measured by a charge-discharge method in the voltage range of 0-2.7 V. In order to improve the performance of the electric double-layer capacitor electrode, various mixtures of CTP and petroleum pitch (PP) were activated at the optimal activation conditions previously determined for CTP. Although the specific capacitance of AC electrodes prepared from CTP only and the mixtures of CTP and PP was not significantly different at a current density of 1 A/g, the AC electrodes from CTP and PP mixtures showed outstanding specific capacitance at higher current rates. In particular, CTP-PP61 (6:1 mixture) had the highest specific capacitance of 132 F/g, and the specific capacitance remained above 90% at a high current density of 3 A/g. It was found that the high specific capacitance could be attributed to the increased micro-pore volume of ACs with pore sizes from 1 to 2 nm, and the high power density could be attributed to the increased meso-pore volume.

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Capacitance behavior of KOH activated mesocarbon microbeads in different aqueous electrolytes

Cited by 97 publications

References 28 publications

Characterization and organic electric-double-layer-capacitor application of KOH activated coal-tar-pitch-based carbons: Effect of carbonization temperature

Characterization and organic electric-double-layer-capacitor application of KOH activated coal-tar-pitch-based carbons: Effect of carbonization temperature

Isolating the effect of pore size distribution on electrochemical double-layer capacitance using activated fluid coke

Activated carbons prepared from mixtures of coal tar pitch and petroleum pitch and their electrochemical performance as electrode materials for electric double-layer capacitor

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