Modern Theories of Carbon‐Based Electrochemical Capacitors

Huang, Jingsong; Qiao, Rui; Feng, Guang; Sumpter, Bobby G.; Meunier, Vincent

doi:10.1002/9783527646661.ch5

Cited by 12 publications

(4 citation statements)

References 142 publications

(227 reference statements)

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“…When an electronically conductive electrode is immersed in an ion-conductive electrolyte solution, a double layer spontaneously forms due to the organization of charges at the electrode–electrolyte interfaces. An EDLC is the simplest and most commercially available supercapacitor, where the charge is physically stored by electrostatic charge adsorption at the interface between electrode and electrolyte. ,,,− One of the significant features of EDLCs is that no charge transfer occurs between the interfaces of electrodes and electrolytes, i.e., no Faradaic processes occur. The specific capacitance of an EDLC is strongly dependent on the accessible surface area of the electrode materials and surface properties of the carbon materials.…”

Section: Basic Background Charge Storage Mechanisms Theory Key Compos...mentioning

confidence: 99%

Design and Mechanisms of Asymmetric Supercapacitors

El‐Kady²,

et al. 2018

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Ongoing technological advances in diverse fields including portable electronics, transportation, and green energy are often hindered by the insufficient capability of energy-storage devices. By taking advantage of two different electrode materials, asymmetric supercapacitors can extend their operating voltage window beyond the thermodynamic decomposition voltage of electrolytes while enabling a solution to the energy storage limitations of symmetric supercapacitors. This review provides comprehensive knowledge to this field. We first look at the essential energy-storage mechanisms and performance evaluation criteria for asymmetric supercapacitors to understand the wide-ranging research conducted in this area. Then we move to the recent progress made for the design and fabrication of electrode materials and the overall structure of asymmetric supercapacitors in different categories. We also highlight several key scientific challenges and present our perspectives on enhancing the electrochemical performance of future asymmetric supercapacitors.

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Section: Basic Background Charge Storage Mechanisms Theory Key Compos...mentioning

confidence: 99%

Design and Mechanisms of Asymmetric Supercapacitors

El‐Kady²,

et al. 2018

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“…In this model, R e accounts for the electrolyte resistance, the high-frequency time constant, R ct C dl , is related to the charge transfer resistance and the double layer capacitance at the oxide layer-electrolyte interface. Considering the semiconductive character of this film, the double layer capacitance should embrace the contributions of the space charge capacitance, C SC ; and the Helmotz layer capacitance, C H , thus the overall C dl can be considered a combination of these two components in series [39]. The low-frequency time constant, R redox C redox , can be associated with the redox processes in the oxide layer.…”

Section: Characterization Of the Passive Film Generated In The Alkali...mentioning

confidence: 99%

Electrochemical characterization of a Fe-based shape memory alloy in an alkaline medium and the behaviour in aggressive conditions

Collazo

Figueroa

Mariño-Martínez

et al. 2023

Electrochimica Acta

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“…The material with huge SSA, large amount of mesopores, and high purity should be an ideal electrode for SCs at 4 V. Capacitance performances of GNF electrode in EMIBF 4 in a two-electrode cell were studied by scanning cyclical voltammograms (CV) at different scan rates (Figure a). They exhibited nearly the trapezoid-shaped CV curves below 200 mV/s, associated with the quantum capacitance of graphene flakes. , Triangle zone in the right bottom was very small, indicating the insignificant redox reaction caused by impurities (oxygen, water, or metal). Specific capacitance was 193 F/g at 0.5 A/g (Figure c, Table S2).…”

mentioning

confidence: 99%

Highly Electroconductive Mesoporous Graphene Nanofibers and Their Capacitance Performance at 4 V

et al. 2014

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We report the fabrication of one-dimensional highly electroconductive mesoporous graphene nanofibers (GNFs) by a chemical vapor deposition method using MgCO3·3H2O fibers as the template. The growth of such a unique structure underwent the first in situ decomposition of MgCO3·3H2O fibers to porous MgO fibers, followed by the deposition of carbon on the MgO surface, the removal of MgO by acidic washing, and the final self-assembly of wet graphene from single to double layer in drying process. GNFs exhibited good structural stability, high surface area, mesopores in large amount, and electrical conductivity 3 times that of carbon nanotube aggregates. It, used as an electrode in a 4 V supercapacitor, exhibited high energy density in a wide range of high power density and excellent cycling stability. The short diffusion distance for ions of ionic liquids electrolyte to the surface of GNFs yielded high surface utilization efficiency and a capacitance up to 15 μF/cm(2), higher than single-walled carbon nanotubes.

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Modern Theories of Carbon‐Based Electrochemical Capacitors

Cited by 12 publications

References 142 publications

Design and Mechanisms of Asymmetric Supercapacitors

Design and Mechanisms of Asymmetric Supercapacitors

Electrochemical characterization of a Fe-based shape memory alloy in an alkaline medium and the behaviour in aggressive conditions

Highly Electroconductive Mesoporous Graphene Nanofibers and Their Capacitance Performance at 4 V

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