Facile simulation of carbon with wide pore size distribution for electric double-layer capacitance based on Helmholtz models

Hsieh, Wan-Yu; Horng, Tzyy Leng; Huang, Hsin Chieh; Teng, Hsisheng

doi:10.1039/c5ta04125b

Cited by 39 publications

(33 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter study refuted the possibility that the presence of binder or wide pore size distributions may hide the variation of the surfacecapacitance with the pore size [88]. The constant pattern for surface-capacitance of carbons obtained experimentally from the effective surface area accessible to the ions agrees with modeling studies [39,41,42,[89][90][91][92] and would be consistent with a decrease in the relative permittivity r in narrow micropores [6,93]. Quantitative estimations of the latter by systematic analyses would provide its incidence on the different electrolytes.…”

Section: Surface Area Accessible To Electrolyte Ionssupporting

confidence: 65%

Capacitance and surface of carbons in supercapacitors

Lobato

Suárez

Guardia

et al. 2017

Carbon

124

View full text Add to dashboard Cite

This research is focused in the missing link between the specific surface area of carbons surface and their electrochemical capacitance. Current protocols used for the characterization of carbons applied in supercapacitors electrodes induce inconsistencies in the values of the interfacial capacitance (in F m-2), which is hindering the optimization of supercapacitors. The constraints of both the physisorption of N 2 at 77 K and the standard methods used for the isotherm analysis frequently lead to a misleading picture of the porosity. Moreover, the specific surface area of carbons loses their meaning when the supercapacitor operates with organic electrolytes and ionic liquids and the actual surface involved in charge storage has to be assessed by molecular probes suiting the critical dimensions of the ions. In the case of certain carbons such as graphene type-materials, the voltage-driven mechanism may facilitate the access of electrolyte ions to spaces between carbon layers, providing a larger area than that estimated by gas adsorption. Finally, the morphological and porous features of carbons can be extremely modified when they are processed in electrodes. Due to their impact, all these issues should not be neglected and the characterization protocols must be adapted for this specific application of carbons.

show abstract

Section: Surface Area Accessible To Electrolyte Ionssupporting

confidence: 65%

Capacitance and surface of carbons in supercapacitors

Lobato

Suárez

Guardia

et al. 2017

Carbon

124

View full text Add to dashboard Cite

show abstract

“…Carbon‐based supercapacitors have greatly attracted attention due to the large surface area, excellent conductivity, wide pore size distribution, and high cycle stability of carbon electrode materials . Main carbon electrode materials include 1D carbon nanotubes (CNTs), carbon fibers (CFs), 2D graphene, and 3D mes‐carbon .…”

Section: Introductionmentioning

confidence: 99%

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

Liu

Wang

et al. 2018

Small

113

View full text Add to dashboard Cite

Flexible supercapacitors have shown enormous potential for portable electronic devices. Herein, hierarchical 3D all-carbon electrode materials are prepared by assembling N-doped graphene quantum dots (N-GQDs) on carbonized MOF materials (cZIF-8) interweaved with carbon nanotubes (CNTs) for flexible all-solid-state supercapacitors. In this ternary electrode, cZIF-8 provides a large accessible surface area, CNTs act as the electrical conductive network, and N-GQDs serve as highly pseudocapactive materials. Due to the synergistic effect and hierarchical assembly of these components, N-GQD@cZIF-8/CNT electrodes exhibit a high specific capacitance of 540 F g at 0.5 A g in a 1 m H SO electrolyte and excellent cycle stability with 90.9% capacity retention over 8000 cycles. The assembled supercapacitor possesses an energy density of 18.75 Wh kg with a power density of 108.7 W kg . Meanwhile, three supercapacitors connected in series can power light-emitting diodes for 20 min. All-solid-state N-GQD@cZIF-8/CNT flexible supercapacitor exhibits an energy density of 14 Wh kg with a power density of 89.3 W kg , while the capacitance retention after 5000 cycles reaches 82%. This work provides an effective way to construct novel electrode materials with high energy storage density as well as good cycling performance and power density for high-performance energy storage devices via the rational design.

show abstract

“…1d) to simulate the capacitance of activated carbons based on data derived from physisorption measurements. 33 In addition, they proposed a pore size dependent dielectric permittivity, which increases linearly up to a pore size of 2 nm. According to formula (5), the capacitance increases with increasing pore size, considering the relative permittivity.…”

Section: Introductionmentioning

confidence: 99%

Insights into the influence of the pore size and surface area of activated carbons on the energy storage of electric double layer capacitors with a new potentially universally applicable capacitor model

Heimböckel

Hoffmann

Fröba

2019

Phys. Chem. Chem. Phys.

125

View full text Add to dashboard Cite

show abstract

Facile simulation of carbon with wide pore size distribution for electric double-layer capacitance based on Helmholtz models

Abstract: Incorporation of surface-based capacitances (C/S) simulated by Helmholtz models with pore size distribution obtained from the non-local density functional theory precisely predicts the double-layer capacitance of distinct forms of carbon.

Cited by 39 publications

References 60 publications

Capacitance and surface of carbons in supercapacitors

Capacitance and surface of carbons in supercapacitors

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

Insights into the influence of the pore size and surface area of activated carbons on the energy storage of electric double layer capacitors with a new potentially universally applicable capacitor model

Contact Info

Product

Resources

About