Pore-size ion-size correlations for carbon supercapacitors

2021 ◽  
Author(s):  
John Chmiola
Keyword(s):  
Pore Size ◽  
Ion Size ◽  
Carbon Supercapacitors

Effect of diffuse layer and pore shapes in mesoporous carbon supercapacitors

2010 ◽  
Vol 25 (8) ◽  
pp. 1469-1475 ◽  
Author(s):  
Jingsong Huang ◽  
Rui Qiao ◽  
Bobby G. Sumpter ◽  
Vincent Meunier
Keyword(s):  
Pore Size ◽  
Mesoporous Carbon ◽  
Diffuse Layer ◽  
Pore Shape ◽  
Mesoporous Carbons ◽  
Cylindrical Pores ◽  
Theoretical Evolution ◽  
Poisson Boltzmann ◽  
Slit Pores ◽  
Carbon Supercapacitors

In the spirit of the theoretical evolution from the Helmholtz model to the Gouy–Chapman–Stern model for electric double-layer capacitors, we explored the effect of a diffuse layer on the capacitance of mesoporous carbon supercapacitors by solving the Poisson–Boltzmann (PB) equation in mesopores of diameters from 2 to 20 nm. To evaluate the effect of pore shape, both slit and cylindrical pores were considered. We found that the diffuse layer does not affect the capacitance significantly. For slit pores, the area-normalized capacitance is nearly independent of pore size, which is not experimentally observed for template carbons. In comparison, for cylindrical pores, PB simulations produce a trend of slightly increasing area-normalized capacitance with pore size, similar to that depicted by the electric double-cylinder capacitor model proposed earlier. These results indicate that it is appropriate to approximate the pore shape of mesoporous carbons as being cylindrical and the electric double-cylinder capacitor model should be used for mesoporous carbons as a replacement of the traditional Helmholtz model.

scholarly journals Relation between the Ion Size and Pore Size for an Electric Double-Layer Capacitor

2008 ◽  
Vol 130 (9) ◽  
pp. 2730-2731 ◽  
Author(s):  
Celine Largeot ◽  
Cristelle Portet ◽  
John Chmiola ◽  
Pierre-Louis Taberna ◽  
Yury Gogotsi ◽  
...  
Keyword(s):  
Pore Size ◽  
Double Layer ◽  
Electric Double Layer ◽  
Electric Double Layer Capacitor ◽  
Double Layer Capacitor ◽  
Ion Size

Insights into the influence of pore size distribution and surface functionalities in the behaviour of carbon supercapacitors

2012 ◽  
Vol 86 ◽  
pp. 241-247 ◽  
Author(s):  
Susana Vaquero ◽  
Raul Díaz ◽  
Marc Anderson ◽  
Jesus Palma ◽  
Rebeca Marcilla
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Carbon Supercapacitors

Capacitive matching of pore size and ion size in the negative and positive electrodes for supercapacitors

2011 ◽  
Vol 56 (25) ◽  
pp. 9248-9256 ◽  
Author(s):  
Gangwei Sun ◽  
Wenhua Song ◽  
Xiaojun Liu ◽  
Donghui Long ◽  
Wenming Qiao ◽  
...  
Keyword(s):  
Pore Size ◽  
Positive Electrodes ◽  
Ion Size ◽  
Electrodes For Supercapacitors

Transfer Technique for Electron Microscopy of Membrance Filter Samples

1974 ◽  
Vol 32 ◽  
pp. 554-555
Author(s):  
Lawrence W. Ortiz ◽  
Bonnie L. Isom
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Pore Size ◽  
Membrane Filters ◽  
Size Dependent

A procedure is described for the quantitative transfer of fibers and particulates collected on membrane filters to electron microscope (EM) grids. Various Millipore MF filters (Millipore AA, HA, GS, and VM; 0.8, 0.45, 0.22 and 0.05 μm mean pore size) have been used with success. Observed particle losses have not been size dependent and have not exceeded 10%. With fibers (glass or asbestos) as the collected media this observed loss is approximately 3%.

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