The influence of pore size and surface area of activated carbons on the performance of ionic liquid based supercapacitors

Pohlmann, Sebastian; Lobato, Belén; Centeno, Teresa A.; Balducci, Andrea

doi:10.1039/c3cp52909f

Cited by 99 publications

(63 citation statements)

References 25 publications

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“…These latter electrodes were prepared as indicated in Ref. . The morphological and structural characteristics of DLC Super 30 have been reported elsewhere …”

Section: Methodsmentioning

confidence: 99%

Characterization of Different Conductive Salts in ACN‐Based Electrolytes for Electrochemical Double‐Layer Capacitors

et al. 2016

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Herein we report a systematic investigation of the chemical and physical properties of acetonitrile‐based electrolytes that contained the salts tetraethylammonium tetrafluroroborate (Et4NBF4), tetraethylammonium bis(trifluoromethanesulfonyl)‐ imide (Et4NTFSI), 1‐butyl‐1‐methylpyrrolidinium tetrafluoroborate (Pyr14BF4), or 1‐butyl‐1‐methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr14TFSI). The ionic conductivity, viscosity, density, and electrochemical stability windows of these electrolytic solutions have been considered in detail. From these results, the electrolyte Et4NTFSI (1 mol dm−3) in ACN appeared to display a promising set of properties that allow the realization of ACN‐based electrochemical double‐layer capacitors able to display stable behavior at 3.1 V.

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“…These latter electrodes were prepared as indicated in Ref. . The morphological and structural characteristics of DLC Super 30 have been reported elsewhere …”

Section: Methodsmentioning

confidence: 99%

Characterization of Different Conductive Salts in ACN‐Based Electrolytes for Electrochemical Double‐Layer Capacitors

et al. 2016

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“…Not reliant on slow redox reactions and only limited by ion mobility within the electrolyte, specific power output of EDLCs is one order of magnitude higher than batteries [10]. However, the stored energy density is still rather small, and thus current research focuses on finding the optimal electrode-electrolyte combination as well as matching electrode structures to increase EDLC capacitance [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Pore-size dependent effects on structure and vibrations of 1-ethyl-3-methylimidazolium tetrafluoroborate in nanoporous carbon

Thürmer

Kobayashi

Ohba

et al. 2015

Chemical Physics Letters

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“…However, for activated porous carbon, the C S values can exceed 300 F g -1 in aqueous electrolytes. 73 As pointed out before, the distribution of pore sizes and/or constrictions at the entrance of the pores leads to significant changes in the C S values, as described in the work of Pohlmann et al, 74 who investigated the effect of pore accessibility and surface area of activated carbons for ionic liquids used as electrolytes in supercapacitors. As discussed for the PSD curves obtained from nitrogen gas sorption experiments, CMFe presented the highest C S value observed in H 2 SO 4 , compared to CMNi and CMCo.…”

Section: Resultsmentioning

confidence: 99%

Direct Synthesis of Porous Carbon Materials Prepared from Diethyldithiocarbamate Metal Complexes and Their Electrochemical Behavior

Silva

Porto

Caliman

et al. 2018

J. Braz. Chem. Soc.

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Porous carbon materials were prepared at low temperatures via thermal decomposition of iron, nickel and cobalt N,N-diethyldithiocarbamates (DDT). X-ray diffraction data showed two peaks at 2θ (25.5° and 43.5°) that indicate the presence of graphite-like structures. Raman spectra displayed D and G bands in the range from 1312 to 1321 cm -1 and 1587 to 1593 cm -1 , respectively, which were fitted with 4 components. All spectra showed two low intensity D* (1190 cm ) bands, assigned to sp 2 -sp 3 bonds in disordered carbonaceous materials and amorphous carbon, respectively. Transmission electron microscopy images showed agglomerates of spherical particles formed by graphitic segments. The results showed that the carbon material obtained from iron N, N-diethyldithiocarbamate, Fe(DDT) 3 , is structurally better organized than the others and the pore size distribution curves confirmed that this material presents high degree of mesoporosity. Voltammetric curves obtained using KOH and H 2 SO 4 electrolytes showed hysteresis behavior typical of capacitors charge/discharge process. The carbon material prepared from Fe(DDT) 3 displayed the highest specific capacitance in acidic media, 59 F g -1 , which was associated to its high degree of mesoporosity. Keywords: carbon materials, diethyldithiocarbamate complexes, electrochemical application IntroductionDifferent physical methods have been used to prepare carbon nanomaterials such as laser ablation, 1,2 arch discharge 3,4 and combustion. 5,6 Thermal decomposition of organic and organometallic precursors [7][8][9] has been presented as a viable alternative to physical methods which use harsh synthesis conditions and yield small amount of products. Different carbon-rich precursors are used to obtain these carbon nanostructures, which can be transformed into graphitic carbon materials of different sizes and shapes. Among these organic precursors, alkynes olygoine derivatives are good candidates due to their high chemical instability, which allows them to undergo different chemical reactions. 10 Various carbon precursors such as benzene, 11 sucrose 12 and phenol resin, 13 are also suitable for the synthesis of carbon materials. Similarly, the pyrolysis of organometallic precursors, such as cobalt acetylacetonate, 14 also yields carbon nanostructures presenting good electrochemical performance which depends on surface area as well as the porosity of these structures. The major problem associated with the method described above is the presence of encapsulated metals.Porous carbon materials are excellent candidates for electrodes in supercapacitors. 15,16 For these materials pore accessibility plays a significant role in the charge storage and the specific capacitance reaches a maximum value when the pore size matches the maximum electrolyte ion dimension. 17 For carbon nanomaterials the surface areas range from 300 to 600 m 2 g -1 and are responsible for electrolyte wetting and rapid ionic motions necessary for da Silva et al. 1905 Vol. 29, No. 9, 2018 a satisfactory electroc...

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The influence of pore size and surface area of activated carbons on the performance of ionic liquid based supercapacitors

Cited by 99 publications

References 25 publications

Characterization of Different Conductive Salts in ACN‐Based Electrolytes for Electrochemical Double‐Layer Capacitors

Characterization of Different Conductive Salts in ACN‐Based Electrolytes for Electrochemical Double‐Layer Capacitors

Pore-size dependent effects on structure and vibrations of 1-ethyl-3-methylimidazolium tetrafluoroborate in nanoporous carbon

Direct Synthesis of Porous Carbon Materials Prepared from Diethyldithiocarbamate Metal Complexes and Their Electrochemical Behavior

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