Enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons
6 pages, 6 figures.-- Printed version published Dec 30, 2008.
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| Format: | artículo biblioteca |
| Language: | English |
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Elsevier
2008-08-07
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| Subjects: | Activated carbon, Electrochemical capacitor, Double layer, Pseudocapacitance, Long-term cycling, |
| Online Access: | http://hdl.handle.net/10261/11095 |
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dig-incar-es-10261-110952018-11-16T07:55:46Z Enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons Ruiz Ruiz, Vanesa Blanco Rodríguez, Clara Granda Ferreira, Marcos Santamaría Ramírez, Ricardo Activated carbon Electrochemical capacitor Double layer Pseudocapacitance Long-term cycling 6 pages, 6 figures.-- Printed version published Dec 30, 2008. This paper studies the effect of thermal treatment on the long-term performance of carbon-based supercapacitors. Two active electrode materials were studied: a mesophase derived activated carbon (AC), rich in oxygen functionalities, and an activated carbon obtained from treating AC at 1000°C (AC-1000), from which most of the functionalities had been removed. Up to 10,000 cycles were performed in aqueous acidic media at different voltage windows (0.6 and 1 V). Both materials showed an excellent life cycle, although the thermally treated carbon showed a significantly better behavior. The initial capacitance of AC-1000 was reduced by only ~5% after 10,000 cycles, independently of the operating voltage, demonstrating that the thermal treatment of AC produces a very stable electrode material at both ranges of potential. The better performance of AC-1000 was attributed to the absence of functional groups and the higher degree of crystalline order that renders materials more stable. The use of these two materials in an asymmetric device resulted in a capacitor that merges both high stability and high capacitance values. The initial capacitance was reduced by only 4.5% after 10,000 galvanostatic cycles and by 10% after 20,000. This work has been carried out 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 2009-02-27T13:06:44Z 2009-02-27T13:06:44Z 2008-08-07 artículo http://purl.org/coar/resource_type/c_6501 Electrochimica Acta 54(2): 305-310 (2008) 0013-4686 http://hdl.handle.net/10261/11095 10.1016/j.electacta.2008.07.079 en http://dx.doi.org/10.1016/j.electacta.2008.07.079 open 22195 bytes application/pdf 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 Blanco Rodríguez, Clara Granda Ferreira, Marcos Santamaría Ramírez, Ricardo Enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons |
| description |
6 pages, 6 figures.-- Printed version published Dec 30, 2008. |
| format |
artículo |
| topic_facet |
Activated carbon Electrochemical capacitor Double layer Pseudocapacitance Long-term cycling |
| author |
Ruiz Ruiz, Vanesa Blanco Rodríguez, Clara Granda Ferreira, Marcos Santamaría Ramírez, Ricardo |
| author_facet |
Ruiz Ruiz, Vanesa Blanco Rodríguez, Clara Granda Ferreira, Marcos Santamaría Ramírez, Ricardo |
| author_sort |
Ruiz Ruiz, Vanesa |
| title |
Enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons |
| title_short |
Enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons |
| title_full |
Enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons |
| title_fullStr |
Enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons |
| title_full_unstemmed |
Enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons |
| title_sort |
enhanced life-cycle supercapacitors by thermal treatment of mesophase-derived activated carbons |
| publisher |
Elsevier |
| publishDate |
2008-08-07 |
| url |
http://hdl.handle.net/10261/11095 |
| work_keys_str_mv |
AT ruizruizvanesa enhancedlifecyclesupercapacitorsbythermaltreatmentofmesophasederivedactivatedcarbons AT blancorodriguezclara enhancedlifecyclesupercapacitorsbythermaltreatmentofmesophasederivedactivatedcarbons AT grandaferreiramarcos enhancedlifecyclesupercapacitorsbythermaltreatmentofmesophasederivedactivatedcarbons AT santamariaramirezricardo enhancedlifecyclesupercapacitorsbythermaltreatmentofmesophasederivedactivatedcarbons |
| _version_ |
1777668854299754496 |