Superior electric double layer capacitors using ordered mesoporous carbons

Wang, Xing; Qiao, Shi Zhang; Ding, Rui; Li, F.; Lu, Gao Qing; Zhang, Yan; Cheng, Hui‐Ming

doi:10.1016/j.carbon.2005.07.029

Cited by 719 publications

(379 citation statements)

References 29 publications

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“…On the other hand, 200-220 F g −1 seems to be the upper limit for this type of electrolyte [24][25][26][27][28][29][30][31][32][33]. This limit is in agreement with the expected value based on 1500-1600 m 2 g −1 as a realistic upper-bound for the specific surface area of templated mesoporous carbons (see Section 3.1).…”

Section: Specific Capacitance At Low Current Densitysupporting

confidence: 86%

“…Recently, some authors have emphasized the ability of new advanced mesoporous carbons to store large amounts of energy with faster charge propagation than that achieved by microporous carbons [23][24][25][26][27][28][29][30][31][32]. It has been reported that the former suit the size of the electrolyte ions and enhance the EDLC performance at high rate.…”

Section: Evolution Of Electrical Capacitance With Current Densitymentioning

confidence: 99%

“…Several studies have suggested promising properties of templated mesoporous carbons (TMC) when used in EDLC systems [23][24][25][26][27][28][29][30][31][32][33], but at the present stage the absence of a systematic analysis does not allow a reliable correlation between the structural characteristics of these materials and their capacitive behaviour. In fact, this approach is of prime importance for the design of carbon electrodes and electrochemical capacitors with improved performances.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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 Densitysupporting

confidence: 86%

Section: Evolution Of Electrical Capacitance With Current Densitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…[2][3][4][5][8][9][10][11][12] Understanding the influence of different mesoporous materials (ordered or disordered arrangement) on ion diffusion behavior is fundamental to enhancing EDLC's performance. However, in the past, the diverse and uncontrollable intrinsic microporous structure of physically or chemically activated carbons has made it impossible to precisely investigate the relations between mesoporous textures and ion diffusion behavior.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pore Packing Defects in 2-D Ordered Mesoporous Carbons on Ionic Transport

et al. 2006

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Ordered mesoporous materials show great importance in energy, environmental, and chemical engineering. The diffusion of guest species in mesoporous networks plays an important role in these applications, especially for energy storage, such as supercapacitors based on ordered mesoporous carbons (OMCs). The ion diffusion behavior in two different 2-D hexagonal OMCs was investigated by using cyclic voltametry and electrochemical impedance spectroscopy. In addition, transmission electron microscopy, small-angle X-ray diffraction, and nitrogen cryosorption methods were used to study the pore structure variations of these two OMCs. It was found that, for the OMC with defective pore channels (termed as pore packing defects), the gravimetric capacitance was greatly decayed when the voltage scan rate was increased. The experimental results suggest that, for the ion diffusion in 2-D hexagonal OMCs with similar mesopore size distribution, the pore packing defect is a dominant dynamic factor.

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“…Figure 2(b) shows the FE-SEM image obtained through the hydrothermal synthesis at 180 ℃ for 36 h. It can be known that the aspect ratio of the nanowire has increased by about two folds compared to the experiment implemented at 150 ℃. Further, it can be ascertained that the nanowire can be easily synthesized when the supply of sufficient heat energy is maintained [6][7][8][9][10][11]. Figure 2(c) shows the FE-SEM image obtained by finally synthesizing the LTO powders, synthesized at 150 ℃ for 36 h using the hydrothermal synthesis method, at 700 ℃ for 6 h in the box furnace.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of Li4Ti5O12 synthesized using hydrogen titanate nanowire for hybrid super capacitor

Kim¹,

Yoon²

2013

J Adv Ceram

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Abstract:The electrical characteristics of hybrid super capacitor were evaluated by synthesizing LTO (Li 4 Ti 5 O 12 ) using TiO 2 having a hydrogen titanate nanowire form. Preparation of the hydrogen titanate nanowire was implemented by using TiO 2 having size of 60 nm and NaOH, and performing synthesis at 70 ℃ for 6 h with a sonochemical method. LTO compound was synthesized at 150 ℃ for 36 h and at 180 ℃ for 36 h respectively by using the hydrogen titanate nanowire and LiOH·H 2 O as starting materials with a hydrothermal method. The final LTO compound was synthesized at 700 ℃ for 6 h using a solid-state method. As a result of manufacturing the hybrid super capacitor using LTO synthesized at 180 ℃ for 36 h with the hydrothermal method, a capacity of 198 mA·h/g has been achieved compared to a theoretical capacity of 172 mA·h/g of existing LTO, and thus, the capacity has been increased by about 13%. Further, such excellent cycle performance has ensured its possibility as a high-capacity capacitor.

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Superior electric double layer capacitors using ordered mesoporous carbons

Cited by 719 publications

References 29 publications

Performance of templated mesoporous carbons in supercapacitors

Performance of templated mesoporous carbons in supercapacitors

Effect of Pore Packing Defects in 2-D Ordered Mesoporous Carbons on Ionic Transport

Preparation and characterization of Li4Ti5O12 synthesized using hydrogen titanate nanowire for hybrid super capacitor

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