Electrochemical capacitance of self-ordered mesoporous carbon

Zhou, Haoshen; Zhu, Shenmin; Hibino, Mitsuhiro; Honma, Itaru

doi:10.1016/s0378-7753(03)00439-7

Cited by 219 publications

(131 citation statements)

References 18 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%

“…However, attempts to find a clear linear relationship between the gravimetric capacitance and surface areas, in particular S BET , have not been conclusive, as the specific capacitance (F m −2 ), may vary strongly from carbon to carbon [5,36,37]. This has been explained by different authors, who suggest that a large fraction of the carbon surface area is not accessible to the electrolyte ions and, consequently, the experimental capacitance (F g −1 ) of these materials depends strongly on the pore size distribution and the connectivity between the pores [5,[23][24][25]31,32,36]. In this context, many studies have been carried out to determine the optimum pore size distribution for the diffusion of the solvated ions within the carbon framework.…”

Section: Specific Capacitance At Low Current Densitymentioning

confidence: 99%

“…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%

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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: Specific Capacitance At Low Current Densitymentioning

confidence: 99%

Section: Evolution Of Electrical Capacitance With Current Densitymentioning

confidence: 99%

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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“…[14] It has been demonstrated by many research groups that OMCs have much better electrochemical performance than conventional high-surface activated carbon (AC) at high current densities both in aqueous [15] and nonaqueous electrolytes. [16] Compared with a wide pore distribution ranging from micropores to macropores and a random pore connection of AC, the OMCs possess a narrow distribution in the mesopore range and a uniform pore connection, but the obtained capacitance, about 8-10 µF cm −2 , is still below the theoretical value estimated to be 20 µF cm −2 for carbon materials. [16] That indicated, a great part of the pore surface in OMCs cannot be effectively utilized in EDLCs.…”

Section: Introductionmentioning

confidence: 80%

Influence of the OMCs pore structures on the capacitive performances of supercapacitor

Nong

Wang

2009

Asia-Pacific J Chem Eng

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In the present study, two mesoporous carbons OMC-KIT-6 and OMC-SBA-16 were nanocasted using mesoporous silica of KIT-6 and SBA-16 as templates and furfuryl alcohol as carbon precursor. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) characterizations confirmed that the resultant samples are mesoporous carbons, and the as-prepared OMC-KIT-6 has an Ia3d ordered structure, whereas OMC-SBA-16 belongs to Im3m space group. The surface area and the average pore size are (1658 m 2 g −1 and 3.4 nm) for OMC-KIT-6 and (1638 m 2 g −1 and 2.9 nm) for OMC-SBA-16, respectively. The results of cyclic voltammograms and galvanostatic charge-discharge tests show that these two mesoporous carbons have excellent capacitive performances. But the difference of capacitive behavior between OMC-KIT-6 and OMC-SBA-16 may be a result of the difference of pore geometries of these two carbons. In order to find out the function of mesopore in a supercapacitor, we compared the capacitive properties of mesoporous and microporous carbons; the experiment results indicated that these two kinds of carbon exhibit nearly ideal capacitive behavior at low scan rate. When the scan rate is enhanced up to 50 mV s −1 the performance of mesoporous carbon is more stable than microporous carbon. This outcome demonstrated that mesopore plays an important role in forming double layers in the electrode materials. 

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Use of Nonaqueous Solutions in Modern Electrochemical Technologies

Izutsu¹

2009

Electrochemistry in Nonaqueous Solutions

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Electrochemical capacitance of self-ordered mesoporous carbon

Cited by 219 publications

References 18 publications

Performance of templated mesoporous carbons in supercapacitors

Performance of templated mesoporous carbons in supercapacitors

Influence of the OMCs pore structures on the capacitive performances of supercapacitor

Use of Nonaqueous Solutions in Modern Electrochemical Technologies

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