Long-term cycling of carbon-based supercapacitors in aqueous media
[EN] The behaviour of mesophase-derived electrodes on long-duration cycling conditions was studied in 1 M sulfuric acid and 6 M potassium hydroxide. Variation in the specific capacitance values with the number of cycles shows a good cycling life performance in acidic media but very poor in an alkaline electrolyte. The total loss of capacitance after 7000 cycles in acidic media is 8% at 0.6 V and 16% at 1 V, whereas in the basic electrolyte the reduction in the capacitance values is 72%, even at a very small operating voltage (0.6 V). This behaviour was associated to the strong oxidation of the positive electrode caused by the progressive shift of the working potential towards very positive potential values during cycling.
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| Subjects: | Activated carbon, Electrochemical capacitor, Double layer, Pseudocapacitance, Long-term cycling, |
| Online Access: | http://hdl.handle.net/10261/88775 |
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dig-incar-es-10261-887752018-11-16T07:55:46Z Long-term cycling of carbon-based supercapacitors in aqueous media Ruiz Ruiz, Vanesa Santamaría Ramírez, Ricardo Granda Ferreira, Marcos Blanco Rodríguez, Clara Activated carbon Electrochemical capacitor Double layer Pseudocapacitance Long-term cycling [EN] The behaviour of mesophase-derived electrodes on long-duration cycling conditions was studied in 1 M sulfuric acid and 6 M potassium hydroxide. Variation in the specific capacitance values with the number of cycles shows a good cycling life performance in acidic media but very poor in an alkaline electrolyte. The total loss of capacitance after 7000 cycles in acidic media is 8% at 0.6 V and 16% at 1 V, whereas in the basic electrolyte the reduction in the capacitance values is 72%, even at a very small operating voltage (0.6 V). This behaviour was associated to the strong oxidation of the positive electrode caused by the progressive shift of the working potential towards very positive potential values during cycling. This work has been performed with financial support from MEC (project MAT2007-61467) and FICYT (project IB05-086-C1). V. Ruiz acknowledges a predoctoral research grant from FICYT. Peer reviewed 2009-07 artículo http://purl.org/coar/resource_type/c_6501 Electrochimica Acta 54(19): 4481–4486 (2008) 0013-4686 http://hdl.handle.net/10261/88775 10.1016/j.electacta.2009.03.024 en http://dx.doi.org/10.1016/j.electacta.2009.03.024 open Elsevier |
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Activated carbon Electrochemical capacitor Double layer Pseudocapacitance Long-term cycling Activated carbon Electrochemical capacitor Double layer Pseudocapacitance Long-term cycling |
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Activated carbon Electrochemical capacitor Double layer Pseudocapacitance Long-term cycling Activated carbon Electrochemical capacitor Double layer Pseudocapacitance Long-term cycling Ruiz Ruiz, Vanesa Santamaría Ramírez, Ricardo Granda Ferreira, Marcos Blanco Rodríguez, Clara Long-term cycling of carbon-based supercapacitors in aqueous media |
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[EN] The behaviour of mesophase-derived electrodes on long-duration cycling conditions was studied in 1 M sulfuric acid and 6 M potassium hydroxide. Variation in the specific capacitance values with the number of cycles shows a good cycling life performance in acidic media but very poor in an alkaline electrolyte. The total loss of capacitance after 7000 cycles in acidic media is 8% at 0.6 V and 16% at 1 V, whereas in the basic electrolyte the reduction in the capacitance values is 72%, even at a very small operating voltage (0.6 V). This behaviour was associated to the strong oxidation of the positive electrode caused by the progressive shift of the working potential towards very positive potential values during cycling. |
| format |
artículo |
| topic_facet |
Activated carbon Electrochemical capacitor Double layer Pseudocapacitance Long-term cycling |
| author |
Ruiz Ruiz, Vanesa Santamaría Ramírez, Ricardo Granda Ferreira, Marcos Blanco Rodríguez, Clara |
| author_facet |
Ruiz Ruiz, Vanesa Santamaría Ramírez, Ricardo Granda Ferreira, Marcos Blanco Rodríguez, Clara |
| author_sort |
Ruiz Ruiz, Vanesa |
| title |
Long-term cycling of carbon-based supercapacitors in aqueous media |
| title_short |
Long-term cycling of carbon-based supercapacitors in aqueous media |
| title_full |
Long-term cycling of carbon-based supercapacitors in aqueous media |
| title_fullStr |
Long-term cycling of carbon-based supercapacitors in aqueous media |
| title_full_unstemmed |
Long-term cycling of carbon-based supercapacitors in aqueous media |
| title_sort |
long-term cycling of carbon-based supercapacitors in aqueous media |
| publisher |
Elsevier |
| url |
http://hdl.handle.net/10261/88775 |
| work_keys_str_mv |
AT ruizruizvanesa longtermcyclingofcarbonbasedsupercapacitorsinaqueousmedia AT santamariaramirezricardo longtermcyclingofcarbonbasedsupercapacitorsinaqueousmedia AT grandaferreiramarcos longtermcyclingofcarbonbasedsupercapacitorsinaqueousmedia AT blancorodriguezclara longtermcyclingofcarbonbasedsupercapacitorsinaqueousmedia |
| _version_ |
1777668911804710912 |