Electrochemical characterization and equivalent circuit modeling of single-walled carbon nanotube (SWCNT) coated electrodes
Single-walled carbon nanotube (SWCNT) coated electrodes are fabricated from functionalized suspensions with different pH values. Their electrochemical properties are characterized using cyclic voltammetry and electrochemical impedance spectroscopy. The effects of the pH value of the suspension on el...
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| Veröffentlicht in: | Journal of power sources 2013-07, Vol.234, p.208-216 |
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| creator | Kang, Jinhee Wen, John Jayaram, Shesha H. Wang, Xiaohui Chen, Shih-Ken |
| description | Single-walled carbon nanotube (SWCNT) coated electrodes are fabricated from functionalized suspensions with different pH values. Their electrochemical properties are characterized using cyclic voltammetry and electrochemical impedance spectroscopy. The effects of the pH value of the suspension on electrochemical performances are investigated through examining the microstructures of the SWCNT films and their BET specific areas and pore volume and size distributions. Both these specific areas and pore size distributions are found being important in determining the specific capacitances of SWCNT coated electrodes. An equivalent circuit model is developed for these electrodes using the measured electrochemical impedance data. It is found that the functionalized nanotube suspensions with higher pH values produce more desirable nanostructured electrodes with the increased specific capacitance and reduced electrode resistance. The role of the pseudo-capacitance which arises from the functionalization group is also discussed.
► Single-walled carbon nanotube electrodes. ► Electro-chemical characterizations. ► Equivalent circuit modeling. |
| doi_str_mv | 10.1016/j.jpowsour.2013.01.058 |
| format | Article |
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| identifier | ISSN: 0378-7753 |
| ispartof | Journal of power sources, 2013-07, Vol.234, p.208-216 |
| issn | 0378-7753 1873-2755 |
| language | eng |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Chemistry Circuit model Coated electrodes Cyclic voltammetry Electrochemistry Electrode Electrodes Equivalent circuits Exact sciences and technology General and physical chemistry Impedance spectroscopy Nanocomposites Nanostructure Pore distribution Porosity Single wall carbon nanotubes Single walled carbon nanotubes |
| title | Electrochemical characterization and equivalent circuit modeling of single-walled carbon nanotube (SWCNT) coated electrodes |
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