Relationship between the nanoporous texture of activated carbons and their capacitance properties in different electrolytes

Raymundo-Piñero, E.; Kierzek, Krzysztof; Machnikowski, J.; Béguin, François

doi:10.1016/j.carbon.2006.05.022

Cited by 910 publications

(606 citation statements)

References 23 publications

Supporting

Mentioning

561

Contrasting

Unclassified

Order By: Relevance

“…3b, based on our data, as well as isolated data reported in the literature [25,41,42,44], a pattern similar to that of H 2 SO 4 applies to the 6 M KOH electrolyte.…”

Section: Specific Capacitance At Low Current Densitysupporting

confidence: 90%

“…However, as seen in Fig. 3a and b based on our data and on data from the literature [25,41,42,44], the specific capacitance in the aqueous H 2 SO 4 and KOH electrolytes is significantly higher for many activated carbons having lower specific surface areas. As shown recently [41][42][43], their better performance is due to the fact that certain oxygencontaining surface complexes also contribute to C 0 in the form of a pseudo-capacitance, to be added to the purely double layer capacitance associated with the surface area [1,5,[41][42][43].…”

Section: Specific Capacitance At Low Current Densitysupporting

confidence: 69%

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

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.

show abstract

“…3b, based on our data, as well as isolated data reported in the literature [25,41,42,44], a pattern similar to that of H 2 SO 4 applies to the 6 M KOH electrolyte.…”

Section: Specific Capacitance At Low Current Densitysupporting

confidence: 90%

Section: Specific Capacitance At Low Current Densitysupporting

confidence: 69%

Performance of templated mesoporous carbons in supercapacitors

Sevilla

Álvarez

Centeno

et al. 2007

Electrochimica Acta

119

View full text Add to dashboard Cite

show abstract

“…Among the different materials studied as electrodes for supercapacitors, activated carbons (ACs) are the most widely used due to their high surface area and relatively low resistivity [2,3]. Because the main energy storage mechanism in EDLCs arises from the electrostatic accumulation of electrolyte ions on the electrode surface, the capacitance of EDLCs typically increases with the specific surface area of the ACs [4,5]. Highly porous materials with specific surface areas exceeding 3000 m 2 g -1 have been obtained by KOH activation of carbons [6][7][8][9], but commercially available ACs typically exhibit a more modest porosity of approximately 1000-1500 m 2 g -1 .…”

Section: Introductionmentioning

confidence: 99%

Nitrogen-containing chitosan-based carbon as an electrode material for high-performance supercapacitors

et al. 2016

View full text Add to dashboard Cite

Nitrogen-containing activated carbons were prepared from chitosan, a widely available and inexpensive biopolysaccharide, by a simple procedure and tested as electrode material in supercapacitors. The physical activation of chitosan chars with CO 2 led to carbons with a very high nitrogen content (up to 5.4 wt%) and moderate surface areas (1000-1100 m 2 g -1 ). Only chitosan-based activated carbons with a similar microporous structure were considered in this study to evaluate the effect of the nitrogen content and distribution on their electrochemical performance. The N-containing activated carbons were tested in two-and three-electrode supercapacitors using an aqueous electrolyte (1 M H 2 SO 4 ), and they exhibited superior surface capacitance (19.5 lF cm -2 ) and pseudocapacitance compared to a commercial activated carbon with a negligible nitrogen content and similar microporosity. The low oxygen content and the presence of stable quaternary nitrogen improved the charge propagation on the chitosan-based carbons, which was confirmed by the high capacity retention of 83 %. The chitosan-based carbons exhibited excellent cyclic stability and maintained 100 % of their capacitance after 5000 charge/discharge cycles at a current density of 1 A g -1 . These results demonstrate the suitability of chitosan-based carbons for application in energy storage systems.Electronic supplementary material The online version of this article

show abstract

“…Micropores (<2 nm, IUPAC definition) mostly contribute to the specific capacitance and the mesopores (2-50 nm) provide diffusion channels for ions, which are critically important for a high power output. According to Raymundo-Piñero et al [50], in order to facilitate access to the electrolyte ions and maximize specific capacitance, the optimal pore sizes for AC should be around 0.7 and 0.8 nm for aqueous and ionic liquids, respectively. Largeot et al [51] showed that the pore size of TiC-derived CDCs should be slightly larger than the sizes of the electrolyte ions to achieve high electrical double layer capacitances.…”

Section: The Parameters Affecting Volumetric Performancementioning

confidence: 99%

Highly densified carbon electrode materials towards practical supercapacitor devices

Zhu

2016

Sci. China Mater.

View full text Add to dashboard Cite

Supercapacitors are expected to bridge the gap between conventional electrostatic capacitors and batteries, but have not found significant application in primary energy devices, partly due to some unsolved problems in the electrode materials. A wide range of novel materials such as novel carbons have been investigated to increase the energy density of the electrodes and the volumetric merits of the materials need to be specifically considered and evaluated, towards the practical application of these novel materials. In observation of the intense research activity to improve the volumetric performance of carbon electrodes, the density or mass loading is particularly important and shall be further optimized, both for commercially applied activated carbons and in novel carbon electrode materials such as graphene. In this review, we presented a brief overview of the recent progress in improving the volumetric performance of carbon-based supercapacitor electrodes, particularly highlighting the development of densified electrodes by various technical strategies including the controlled assembly of carbon building blocks, developing carbon based hybrid composites and constructing micro-supercapacitors.

show abstract

Relationship between the nanoporous texture of activated carbons and their capacitance properties in different electrolytes

Cited by 910 publications

References 23 publications

Performance of templated mesoporous carbons in supercapacitors

Performance of templated mesoporous carbons in supercapacitors

Nitrogen-containing chitosan-based carbon as an electrode material for high-performance supercapacitors

Highly densified carbon electrode materials towards practical supercapacitor devices

Contact Info

Product

Resources

About