Electrical Double-Layer Capacitors and Pseudocapacitors

Béguin, François; Raymundo-Piñero, E.; Frąckowiak, Elżbieta

doi:10.1201/9781420055405-c8

Cited by 26 publications

(28 citation statements)

References 121 publications

(251 reference statements)

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“…Activated carbons are the most employed materials as electrodes for supercapacitors, mainly due to their large apparent surface area, proper electrical conductivity, high electrochemical stability and competitive production cost [2]. Also, their surface chemistry can be conveniently modified to introduce surface functionalities that could improve the performance of these materials by an increase of electrochemical stability, conductivity, wettability or pseudocapacitance [3].…”

Section: Introductionmentioning

confidence: 99%

“…This energy storage mechanism is often complemented with pseudocapacitive processes produced by fast redox reactions occurring in electroactive surface functional groups. The development of electrode materials with large surface area, electroactive functional groups and high electrochemical stability is crucial for the improvement of the energy density and durability of these devices [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen doped superporous carbon prepared by a mild method. Enhancement of supercapacitor performance

Mostazo‐López

Ruiz-Rosas

Morallón

et al. 2016

International Journal of Hydrogen Energy

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Nitrogen functionalization (ca. 4 at. % N XPS ) of a highly microporous activated carbon (S BET >3000m 2 /g) has been achieved by two different approaches at mild conditions: (i) oxidation and post-reaction with nitrogen reactants, and (ii) direct reaction of pristine carbon material with nitrogen reactants. Interestingly, the introduction of nitrogen functionalities allows full preservation of the microporosity when pathway (ii) is followed. The electrochemical performance of the carbon materials as electrodes for supercapacitors was evaluated by using symmetric and asymmetric configuration in 1M H 2 SO 4 . Both nitrogen-functionalized carbon materials showed larger stability and energy efficiency than the pristine carbon material when working at 1.4V. The non-oxidized and functionalized activated carbon evidences the best performance as electrode for supercapacitor, providing energy and power density of 14.5 Wh/kg and 61.2 kW/kg and keeping 83% of original capacitance after 5000 charge-discharge cycles.This improvement is related to the presence of surface nitrogen functionalities that provide a higher electrochemical stability, avoiding the formation of detrimental oxygen groups during the operation of the supercapacitor.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrogen doped superporous carbon prepared by a mild method. Enhancement of supercapacitor performance

Mostazo‐López

Ruiz-Rosas

Morallón

et al. 2016

International Journal of Hydrogen Energy

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“…The log |Z | vs. log f plots [54][55][56] (Fig. 6) at very low frequencies at more negative electrode potentials (at E ≤ −1.45 V).…”

Section: 41mentioning

confidence: 99%

“…11,12 Noticeable deviation from adsorption limited step process takes place at Bi(111) | EMImBr + EMImBF 4 interface at E ≤ −1.22 V, if c Br− ≥ 2%, similarly to c I− ≥ 2%. According to the theory, [54][55][56] the ratio of C p /C s = 1 is characteristic of the adsorption limited processes, C p /C s = 0.5 for diffusion limiting step. In real systems, the ratio depends noticeably on the electrode potential applied.…”

Section: 41mentioning

confidence: 99%

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Electrochemical Investigation of 1-Ethyl-3-methylimidazolium Bromide and Tetrafluoroborate Mixture at Bi(111) Electrode Interface

Siimenson

Lembinen

Oll

et al. 2016

J. Electrochem. Soc.

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Electrochemical characterization of the interface between Bi(111) surface and ionic liquid mixtures of 1-ethyl-3-methylimidazolium tetrafluoroborate with 1-ethyl-3-methylimidazolium bromide (EMImBF 4 + x% EMImBr) has been evaluated by using the electrochemical impedance spectroscopy, cyclic voltammetry methods and density functional theory calculations. Dependence of the experimental data on the bromide concentration and on the electrode potential has been analyzed. Comparison of adsorption data with Bi(111) | EMImBF 4 + x% EMImI interface shows that adsorption activity of halide ions from EMImBF 4 follows a similar trend as from the aqueous and organic electrolyte solutions. The adsorption activity of anions increases in order Cl − < Br − < I − , despite the fact that the solvation properties of relevant media are significantly different. We discuss this trend in the light of a possible application of the RTIL mixtures as an electrolyte for electrochemical energy storage devices like supercapacitors. The ionic liquids as electrolytes have been studied since the early 20 th century, but there is still much to be understood regarding some fundamental aspects. [1][2][3][4][5][6] Theoretical models that explain the dependence of the differential capacitance values on the electrode potentials have been worked out for the aqueous and non-aqueous electrolytes and molten salts. 7,8 However, in the case of the specific adsorption, there are no detailed models for the electrical double layer capacitance, that analyze the influence of the surface-active anion concentration and electrode potential on the specific interaction energy (including charge transfer) and on the distance of the closest approach of anions onto the metal electrode surface.5,9,10 Therefore, the detailed analysis and characterization of these complex electrode | ionic liquid interfaces (with the addition of ions that might have strong chemical interactions and high interaction energies with electrode surface layer atoms, demonstrating very negative Gibbs adsorption energy values, so-called strong specific adsorption properties) is considered our high priority. Bismuth, as an electrode material, has been studied widely and has shown good electrochemical stability and high reproducibility of the data. The properties are inevitable for detailed investigation of interfacial adsorption and faradaic charge transfer processes. The amount of previously measured adsorption data from different electrolytes (including electrochemical impedance spectroscopy and in situ STM methods) enables to develop more realistic, i.e. complex models for the electrical double layer capacitance, that analyze the influence of the surface-active anion addition on the inner layer structure, dielectric permittivity, effective dipoles moment for dipole created at metal|RTIL interface, etc. 7,[11][12][13][14] To continue with the systematic research of halide ions, 1-ethyl-3-methylimidazolium bromide (EMImBr) was selected for the source of bromide ions. There are some theoretical and e...

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Some Aspects of Preparations and Applications of Electrochemical Double‐Layer Capacitors (Supercapacitors)

Kolosov

Изотов

Kolosova

et al. 2021

Handbook of Supercapacitor Materials

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Electrical Double-Layer Capacitors and Pseudocapacitors

Cited by 26 publications

References 121 publications

Nitrogen doped superporous carbon prepared by a mild method. Enhancement of supercapacitor performance

Nitrogen doped superporous carbon prepared by a mild method. Enhancement of supercapacitor performance

Electrochemical Investigation of 1-Ethyl-3-methylimidazolium Bromide and Tetrafluoroborate Mixture at Bi(111) Electrode Interface

Some Aspects of Preparations and Applications of Electrochemical Double‐Layer Capacitors (Supercapacitors)

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