Surface-related capacitance of microporous carbons in aqueous and organic electrolytes
This paper examines the surface-related capacitance C/S of carbons with average micropore widths between 0.73 and 1.80 nm, using 1–2 M H2SO4, 6 M KOH and 1 M (C2H5)4NBF4 in acetonitrile as electrolytes. Following corrections for pseudocapacitance effects for the aqueous electrolytes and the use of an average surface area suggested by independent techniques, different from the BET area, it appears that C/S is practically independent of the micropore width. The analysis of the data with the help of recent models suggests that the dielectric constants ɛr of the different electrolytes may decrease with the pore size. It is surprising that the coexistence of two sets of values for the surface area of microporous carbons and its consequence on C/S have not received more attention in the past.
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Format: | artículo biblioteca |
Language: | English |
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Elsevier
2011-08
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Subjects: | Electrochemical capacitor, Carbon, Microporosity, Surface functionalities, Dielectric constant, |
Online Access: | http://hdl.handle.net/10261/100230 |
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dig-incar-es-10261-1002302018-10-05T09:49:42Z Surface-related capacitance of microporous carbons in aqueous and organic electrolytes Álvarez Centeno, Teresa Stoeckli, Fritz Electrochemical capacitor Carbon Microporosity Surface functionalities Dielectric constant This paper examines the surface-related capacitance C/S of carbons with average micropore widths between 0.73 and 1.80 nm, using 1–2 M H2SO4, 6 M KOH and 1 M (C2H5)4NBF4 in acetonitrile as electrolytes. Following corrections for pseudocapacitance effects for the aqueous electrolytes and the use of an average surface area suggested by independent techniques, different from the BET area, it appears that C/S is practically independent of the micropore width. The analysis of the data with the help of recent models suggests that the dielectric constants ɛr of the different electrolytes may decrease with the pore size. It is surprising that the coexistence of two sets of values for the surface area of microporous carbons and its consequence on C/S have not received more attention in the past. Peer reviewed 2014-07-21T09:57:15Z 2014-07-21T09:57:15Z 2011-08 artículo http://purl.org/coar/resource_type/c_6501 Electrochimica Acta 56(21): 7334-7339 (2011) 0013-4686 http://hdl.handle.net/10261/100230 10.1016/j.electacta.2011.06.040 en Postprint http://dx.doi.org/10.1016/j.electacta.2011.06.040 Sí open Elsevier |
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Electrochemical capacitor Carbon Microporosity Surface functionalities Dielectric constant Electrochemical capacitor Carbon Microporosity Surface functionalities Dielectric constant |
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Electrochemical capacitor Carbon Microporosity Surface functionalities Dielectric constant Electrochemical capacitor Carbon Microporosity Surface functionalities Dielectric constant Álvarez Centeno, Teresa Stoeckli, Fritz Surface-related capacitance of microporous carbons in aqueous and organic electrolytes |
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This paper examines the surface-related capacitance C/S of carbons with average micropore widths between 0.73 and 1.80 nm, using 1–2 M H2SO4, 6 M KOH and 1 M (C2H5)4NBF4 in acetonitrile as electrolytes. Following corrections for pseudocapacitance effects for the aqueous electrolytes and the use of an average surface area suggested by independent techniques, different from the BET area, it appears that C/S is practically independent of the micropore width. The analysis of the data with the help of recent models suggests that the dielectric constants ɛr of the different electrolytes may decrease with the pore size. It is surprising that the coexistence of two sets of values for the surface area of microporous carbons and its consequence on C/S have not received more attention in the past. |
format |
artículo |
topic_facet |
Electrochemical capacitor Carbon Microporosity Surface functionalities Dielectric constant |
author |
Álvarez Centeno, Teresa Stoeckli, Fritz |
author_facet |
Álvarez Centeno, Teresa Stoeckli, Fritz |
author_sort |
Álvarez Centeno, Teresa |
title |
Surface-related capacitance of microporous carbons in aqueous and organic electrolytes |
title_short |
Surface-related capacitance of microporous carbons in aqueous and organic electrolytes |
title_full |
Surface-related capacitance of microporous carbons in aqueous and organic electrolytes |
title_fullStr |
Surface-related capacitance of microporous carbons in aqueous and organic electrolytes |
title_full_unstemmed |
Surface-related capacitance of microporous carbons in aqueous and organic electrolytes |
title_sort |
surface-related capacitance of microporous carbons in aqueous and organic electrolytes |
publisher |
Elsevier |
publishDate |
2011-08 |
url |
http://hdl.handle.net/10261/100230 |
work_keys_str_mv |
AT alvarezcentenoteresa surfacerelatedcapacitanceofmicroporouscarbonsinaqueousandorganicelectrolytes AT stoecklifritz surfacerelatedcapacitanceofmicroporouscarbonsinaqueousandorganicelectrolytes |
_version_ |
1777668924437954560 |