Effect of pore size distribution of coal-based activated carbons on double layer capacitance

Gryglewicz, Grażyna; Machnikowski, J.; Lorenc-Grabowska, Ewa; Lota, Grzegorz; Frąckowiak, Elżbieta

doi:10.1016/j.electacta.2004.07.045

Cited by 315 publications

(183 citation statements)

References 17 publications

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“…Well balanced micro/meso porosity is crucial for a good capacitor operation. It is well known that very high mesopores content is even harmful for optimal capacitor operation [19]. Moreover, the higher mesopore volume, the lower density of material that diminishes the volumetric energy of these advanced carbons.…”

Section: Discussionmentioning

confidence: 99%

Templated mesoporous carbons for supercapacitor application

Fuertes

Lota

Centeno

et al. 2005

Electrochimica Acta

413

210

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Mesoporous carbons prepared by an inverse replica technique have been used as electrodes for electrochemical capacitors. Such well sized carbons were prepared from mesostructured SBA-16 silica materials that served as templates whereas polyfurfuryl alcohol was the carbon precursor. Two highly mesoporous carbons characterized by 3 and 8 nm average pore diameter were tested in various electrolytic solutions (acidic, alkaline and aprotic).It can be concluded that templated mesoporous carbons with tailored pore size distribution are very promising materials to be used as electrodes in supercapacitors.The design of their pore size allows suiting the dimensions of electrolyte ions and efficient charging of the electrical double layer is achieved especially at high current load. Definitively better capacitance performance has been found for carbon with 3 nm pores range, however, cycling performance depends not only on the pore size.

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Section: Discussionmentioning

confidence: 99%

Templated mesoporous carbons for supercapacitor application

Fuertes

Lota

Centeno

et al. 2005

Electrochimica Acta

413

210

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“…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

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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

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“…In some cases, dependence either does not observe at all or observe in a limited range of the surface area values. Thus, studies of the activated carbons [29][30][31][32] and activated carbon nanofibers [33] showed that after some critical value (in most of cases around 1500 m 2 /g) capacitance becomes independent of the surface area. Tendency to saturation supports by the idea that only limited available for the electrolyte surface takes part in the formation of the electric double layer.…”

Section: Resultsmentioning

confidence: 99%

Micro–mesoporous carbons from rice husk as active materials for supercapacitors

Lebedeva

Ayupov

Kuznetsov

et al. 2015

Mater Renew Sustain Energy

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Activated carbons were prepared from rice husk carbonized in the fluidized catalysts bed reactor. Using the different activating agents, samples with BET surface area in the range from 540 to 3060 m 2 /g were achieved. Using sodium or potassium carbonates results in the BET surface area up to 1400 m 2 /g. Hydroxides of sodium or potassium yield the samples with the higher BET surface area (up to 3060 m 2 /g). Textural peculiarities of the carbons were studied by the adsorption of nitrogen at 77 K and of carbon dioxide at 273 K. As active materials for supercapacitors, the porous carbon samples were examined by cyclic voltammetry and chronopotentiometry in galvanostatic mode in 1 M H 2 SO 4 as the electrolyte using home-made three-electrode electrochemical glass cell. Gravimetric capacitance of the carbons is linearly proportional to the BET surface area and reaches 230 and 196 F/g at discharge current density of 0.2 and 1 A/g, respectively, for the samples with the highest surface area.

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Effect of pore size distribution of coal-based activated carbons on double layer capacitance

Cited by 315 publications

References 17 publications

Templated mesoporous carbons for supercapacitor application

Templated mesoporous carbons for supercapacitor application

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

Micro–mesoporous carbons from rice husk as active materials for supercapacitors

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