Supercapacitor modified with methylene blue as redox active electrolyte
MWCNT-based supercapacitors (SC) containing methylene blue (MB) as redox active electrolyte were studied. MWCNTs were employed as model of electrode active material due to their ideal double-layer behavior facilitates the investigation of the energy storage mechanisms involved. MB led to a cell capacitance enhancement equal to 4.5 times the original cell capacitance of MWCNTs in sulphuric acid with a capacitance reduction of only 12% after 6000 charge–discharge cycles. The potential evolution of each electrode during galvanostatic cycling revealed that MB redox reaction develops in both electrodes simultaneously in the voltage range of 0–0.104 V and that this is the main cause of cell capacitance enhancement. Beyond this voltage range, the Faradaic contribution from the MB redox reaction decreases because the anode behaves as a capacitative electrode with a rather reduced charge-capacity due to the small surface area of MWCNTs. By means of a modified assembly composed of a Nafion membrane and MB and sulfuric acid solutions located in the cathode and anode compartments, respectively, it was demonstrated the limiting role of the capacitative electrode in the cell charge-capacity in this type of hybrid devices.
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Format: | artículo biblioteca |
Language: | English |
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Subjects: | Methylene blue, Multiwalled carbon nanotubes, Faradaic reactions, Redox electrolyte, Supercapacitor, |
Online Access: | http://hdl.handle.net/10261/114339 |
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dig-incar-es-10261-1143392018-11-16T07:55:46Z Supercapacitor modified with methylene blue as redox active electrolyte Roldán Luna, Silvia Granda Ferreira, Marcos Menéndez López, Rosa María Santamaría Ramírez, Ricardo Blanco Rodríguez, Clara Methylene blue Multiwalled carbon nanotubes Faradaic reactions Redox electrolyte Supercapacitor MWCNT-based supercapacitors (SC) containing methylene blue (MB) as redox active electrolyte were studied. MWCNTs were employed as model of electrode active material due to their ideal double-layer behavior facilitates the investigation of the energy storage mechanisms involved. MB led to a cell capacitance enhancement equal to 4.5 times the original cell capacitance of MWCNTs in sulphuric acid with a capacitance reduction of only 12% after 6000 charge–discharge cycles. The potential evolution of each electrode during galvanostatic cycling revealed that MB redox reaction develops in both electrodes simultaneously in the voltage range of 0–0.104 V and that this is the main cause of cell capacitance enhancement. Beyond this voltage range, the Faradaic contribution from the MB redox reaction decreases because the anode behaves as a capacitative electrode with a rather reduced charge-capacity due to the small surface area of MWCNTs. By means of a modified assembly composed of a Nafion membrane and MB and sulfuric acid solutions located in the cathode and anode compartments, respectively, it was demonstrated the limiting role of the capacitative electrode in the cell charge-capacity in this type of hybrid devices. The authors acknowledge the financial support of the MICINN (Project MAT2010-20601-C02-01). Silvia Roldán thanks MICINN for a FPI predoctoral research grant. Peer reviewed 2012-08 artículo http://purl.org/coar/resource_type/c_6501 Electrochimica Acta 83: 241-246 (2012) 0013-4686 http://hdl.handle.net/10261/114339 10.1016/j.electacta.2012.08.026 en Postprint http://dx.doi.org/10.1016/j.electacta.2012.08.026 Sí open Elsevier |
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Methylene blue Multiwalled carbon nanotubes Faradaic reactions Redox electrolyte Supercapacitor Methylene blue Multiwalled carbon nanotubes Faradaic reactions Redox electrolyte Supercapacitor |
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Methylene blue Multiwalled carbon nanotubes Faradaic reactions Redox electrolyte Supercapacitor Methylene blue Multiwalled carbon nanotubes Faradaic reactions Redox electrolyte Supercapacitor Roldán Luna, Silvia Granda Ferreira, Marcos Menéndez López, Rosa María Santamaría Ramírez, Ricardo Blanco Rodríguez, Clara Supercapacitor modified with methylene blue as redox active electrolyte |
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MWCNT-based supercapacitors (SC) containing methylene blue (MB) as redox active electrolyte were studied. MWCNTs were employed as model of electrode active material due to their ideal double-layer behavior facilitates the investigation of the energy storage mechanisms involved. MB led to a cell capacitance enhancement equal to 4.5 times the original cell capacitance of MWCNTs in sulphuric acid with a capacitance reduction of only 12% after 6000 charge–discharge cycles. The potential evolution of each electrode during galvanostatic cycling revealed that MB redox reaction develops in both electrodes simultaneously in the voltage range of 0–0.104 V and that this is the main cause of cell capacitance enhancement. Beyond this voltage range, the Faradaic contribution from the MB redox reaction decreases because the anode behaves as a capacitative electrode with a rather reduced charge-capacity due to the small surface area of MWCNTs. By means of a modified assembly composed of a Nafion membrane and MB and sulfuric acid solutions located in the cathode and anode compartments, respectively, it was demonstrated the limiting role of the capacitative electrode in the cell charge-capacity in this type of hybrid devices. |
format |
artículo |
topic_facet |
Methylene blue Multiwalled carbon nanotubes Faradaic reactions Redox electrolyte Supercapacitor |
author |
Roldán Luna, Silvia Granda Ferreira, Marcos Menéndez López, Rosa María Santamaría Ramírez, Ricardo Blanco Rodríguez, Clara |
author_facet |
Roldán Luna, Silvia Granda Ferreira, Marcos Menéndez López, Rosa María Santamaría Ramírez, Ricardo Blanco Rodríguez, Clara |
author_sort |
Roldán Luna, Silvia |
title |
Supercapacitor modified with methylene blue as redox active electrolyte |
title_short |
Supercapacitor modified with methylene blue as redox active electrolyte |
title_full |
Supercapacitor modified with methylene blue as redox active electrolyte |
title_fullStr |
Supercapacitor modified with methylene blue as redox active electrolyte |
title_full_unstemmed |
Supercapacitor modified with methylene blue as redox active electrolyte |
title_sort |
supercapacitor modified with methylene blue as redox active electrolyte |
publisher |
Elsevier |
url |
http://hdl.handle.net/10261/114339 |
work_keys_str_mv |
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