Comparison between electrochemical capacitors based on NaOH and KOH activated carbons
This work describes the chemical activation of a coke using two different activating agents to investigate their behavior as electrodes in supercapacitors. A coke was chemically activated with two hydroxides (KOH and NaOH) under nitrogen flow, at a constant mass hydroxide/coke ratio of 2 and temperatures of 600, 650, and 700 °C. All of the samples were characterized in terms of porosity by N2 sorption at 77 K, surface chemistry by temperature-programmed desorption (TPD), and electrical conductivity. Their electrochemical behavior as electric double-layer capacitors was determined using galvanostatic, voltammetric, and impedance spectroscopy techniques in an aqueous medium with 1 M H2SO4 as the electrolyte. Large differences in capacitive behavior with the increase in the current density were found between the two series of activated samples. The different trends were correlated with the results obtained from the TPD analysis of the CO-type oxygen groups. It was found that these oxygen groups make a positive contribution to capacitance, finding a good correlation between the specific capacitance values, and the amount of these oxygen groups was found for both series.
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Format: | artículo biblioteca |
Language: | English |
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American Chemical Society
2010-03
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Subjects: | Coke, Chemical activation, Activation temperature, Carbon electrodes, Electrochemical properties, Supercapacitors, |
Online Access: | http://hdl.handle.net/10261/142692 http://dx.doi.org/10.13039/501100004837 |
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dig-incar-es-10261-1426922018-11-16T07:55:46Z Comparison between electrochemical capacitors based on NaOH and KOH activated carbons Roldán Luna, Silvia Villar Masetto, Isabel Ruiz Ruiz, Vanesa Blanco Rodríguez, Clara Granda Ferreira, Marcos Menéndez López, Rosa María Santamaría Ramírez, Ricardo Ministerio de Ciencia e Innovación (España) Coke Chemical activation Activation temperature Carbon electrodes Electrochemical properties Supercapacitors This work describes the chemical activation of a coke using two different activating agents to investigate their behavior as electrodes in supercapacitors. A coke was chemically activated with two hydroxides (KOH and NaOH) under nitrogen flow, at a constant mass hydroxide/coke ratio of 2 and temperatures of 600, 650, and 700 °C. All of the samples were characterized in terms of porosity by N2 sorption at 77 K, surface chemistry by temperature-programmed desorption (TPD), and electrical conductivity. Their electrochemical behavior as electric double-layer capacitors was determined using galvanostatic, voltammetric, and impedance spectroscopy techniques in an aqueous medium with 1 M H2SO4 as the electrolyte. Large differences in capacitive behavior with the increase in the current density were found between the two series of activated samples. The different trends were correlated with the results obtained from the TPD analysis of the CO-type oxygen groups. It was found that these oxygen groups make a positive contribution to capacitance, finding a good correlation between the specific capacitance values, and the amount of these oxygen groups was found for both series. This work was supported by the MICIN (Project MAT2007-61467). Peer reviewed 2017-01-18T12:25:38Z 2017-01-18T12:25:38Z 2010-03 artículo http://purl.org/coar/resource_type/c_6501 Energy and Fuels 24(6): 3422–3428 (2010) 0887-0624 http://hdl.handle.net/10261/142692 10.1021/ef901538m 1520-5029 http://dx.doi.org/10.13039/501100004837 en Postprint http://dx.doi.org/10.1021/ef901538m Sí open American Chemical Society |
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Coke Chemical activation Activation temperature Carbon electrodes Electrochemical properties Supercapacitors Coke Chemical activation Activation temperature Carbon electrodes Electrochemical properties Supercapacitors |
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Coke Chemical activation Activation temperature Carbon electrodes Electrochemical properties Supercapacitors Coke Chemical activation Activation temperature Carbon electrodes Electrochemical properties Supercapacitors Roldán Luna, Silvia Villar Masetto, Isabel Ruiz Ruiz, Vanesa Blanco Rodríguez, Clara Granda Ferreira, Marcos Menéndez López, Rosa María Santamaría Ramírez, Ricardo Comparison between electrochemical capacitors based on NaOH and KOH activated carbons |
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This work describes the chemical activation of a coke using two different activating agents to investigate their behavior as electrodes in supercapacitors. A coke was chemically activated with two hydroxides (KOH and NaOH) under nitrogen flow, at a constant mass hydroxide/coke ratio of 2 and temperatures of 600, 650, and 700 °C. All of the samples were characterized in terms of porosity by N2 sorption at 77 K, surface chemistry by temperature-programmed desorption (TPD), and electrical conductivity. Their electrochemical behavior as electric double-layer capacitors was determined using galvanostatic, voltammetric, and impedance spectroscopy techniques in an aqueous medium with 1 M H2SO4 as the electrolyte. Large differences in capacitive behavior with the increase in the current density were found between the two series of activated samples. The different trends were correlated with the results obtained from the TPD analysis of the CO-type oxygen groups. It was found that these oxygen groups make a positive contribution to capacitance, finding a good correlation between the specific capacitance values, and the amount of these oxygen groups was found for both series. |
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Ministerio de Ciencia e Innovación (España) |
author_facet |
Ministerio de Ciencia e Innovación (España) Roldán Luna, Silvia Villar Masetto, Isabel Ruiz Ruiz, Vanesa Blanco Rodríguez, Clara Granda Ferreira, Marcos Menéndez López, Rosa María Santamaría Ramírez, Ricardo |
format |
artículo |
topic_facet |
Coke Chemical activation Activation temperature Carbon electrodes Electrochemical properties Supercapacitors |
author |
Roldán Luna, Silvia Villar Masetto, Isabel Ruiz Ruiz, Vanesa Blanco Rodríguez, Clara Granda Ferreira, Marcos Menéndez López, Rosa María Santamaría Ramírez, Ricardo |
author_sort |
Roldán Luna, Silvia |
title |
Comparison between electrochemical capacitors based on NaOH and KOH activated carbons |
title_short |
Comparison between electrochemical capacitors based on NaOH and KOH activated carbons |
title_full |
Comparison between electrochemical capacitors based on NaOH and KOH activated carbons |
title_fullStr |
Comparison between electrochemical capacitors based on NaOH and KOH activated carbons |
title_full_unstemmed |
Comparison between electrochemical capacitors based on NaOH and KOH activated carbons |
title_sort |
comparison between electrochemical capacitors based on naoh and koh activated carbons |
publisher |
American Chemical Society |
publishDate |
2010-03 |
url |
http://hdl.handle.net/10261/142692 http://dx.doi.org/10.13039/501100004837 |
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