Electrodeposition of Polyaniline on Tantalum: Redox Behavior, Morphology and Capacitive Properties
Polyaniline (PANI) is among the most widely studied conducting polymers due to its potential technological applications in various fields. Recently, PANI-based hybrid materials have played an important role in the development of energy storage and conversion systems. The aim of the present work is t...
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MDPI AG
2023-10-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/21/7286 |
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| author | Chrysanthi Gkili Konstantinos Deligiannakis Eirini Lappa Chrysanthi Papoulia Dimitra Sazou |
| author_facet | Chrysanthi Gkili Konstantinos Deligiannakis Eirini Lappa Chrysanthi Papoulia Dimitra Sazou |
| author_sort | Chrysanthi Gkili |
| collection | DOAJ |
| description | Polyaniline (PANI) is among the most widely studied conducting polymers due to its potential technological applications in various fields. Recently, PANI-based hybrid materials have played an important role in the development of energy storage and conversion systems. The aim of the present work is the investigation of the simultaneous electrochemical growth of PANI and Ta<sub>2</sub>O<sub>5</sub> on the Ta substrate and the characterization of the morphology, redox behavior and pseudocapacitive properties of the resulting micro- or nanostructured composite thin films. A well-adherent conductive Ta<sub>2</sub>O<sub>5</sub>-PANI composite film was first formed using cyclic voltammetry on Ta that facilitates the on-top electrodeposition of single PANI via an autocatalytic mechanism. The electrochemical characterization of the Ta|Ta<sub>2</sub>O<sub>5</sub>-PANI|PANI electrodes reveals unique redox properties of PANI not shown previously upon using PANI electrodeposition on Ta. Scanning electron microscopy shows that the morphology of the electrodeposited films comprises nano- or microspheres that may develop into nano- or microrods when the polymerization proceeds. Preliminary evaluation of the capacitive properties of the Ta|Ta<sub>2</sub>O<sub>5</sub>-PANI|PANI electrode shows adequately high specific capacitance values as high as 1130 F g<sup>−1</sup> (at 9.2 mA cm<sup>−2</sup>), depending on the electrochemical parameters, as well as adequate stability (~80% retention after 100 cycles), indicating their potential application as energy storage devices. |
| first_indexed | 2024-03-11T11:25:26Z |
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| id | doaj.art-7f6cf00f29434b548b4fc7f98e5c9f2c |
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| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T11:25:26Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-7f6cf00f29434b548b4fc7f98e5c9f2c2023-11-10T15:08:29ZengMDPI AGMolecules1420-30492023-10-012821728610.3390/molecules28217286Electrodeposition of Polyaniline on Tantalum: Redox Behavior, Morphology and Capacitive PropertiesChrysanthi Gkili0Konstantinos Deligiannakis1Eirini Lappa2Chrysanthi Papoulia3Dimitra Sazou4Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceDepartment of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceDepartment of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceDepartment of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceDepartment of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreecePolyaniline (PANI) is among the most widely studied conducting polymers due to its potential technological applications in various fields. Recently, PANI-based hybrid materials have played an important role in the development of energy storage and conversion systems. The aim of the present work is the investigation of the simultaneous electrochemical growth of PANI and Ta<sub>2</sub>O<sub>5</sub> on the Ta substrate and the characterization of the morphology, redox behavior and pseudocapacitive properties of the resulting micro- or nanostructured composite thin films. A well-adherent conductive Ta<sub>2</sub>O<sub>5</sub>-PANI composite film was first formed using cyclic voltammetry on Ta that facilitates the on-top electrodeposition of single PANI via an autocatalytic mechanism. The electrochemical characterization of the Ta|Ta<sub>2</sub>O<sub>5</sub>-PANI|PANI electrodes reveals unique redox properties of PANI not shown previously upon using PANI electrodeposition on Ta. Scanning electron microscopy shows that the morphology of the electrodeposited films comprises nano- or microspheres that may develop into nano- or microrods when the polymerization proceeds. Preliminary evaluation of the capacitive properties of the Ta|Ta<sub>2</sub>O<sub>5</sub>-PANI|PANI electrode shows adequately high specific capacitance values as high as 1130 F g<sup>−1</sup> (at 9.2 mA cm<sup>−2</sup>), depending on the electrochemical parameters, as well as adequate stability (~80% retention after 100 cycles), indicating their potential application as energy storage devices.https://www.mdpi.com/1420-3049/28/21/7286tantalum oxidepolyaniline nanospheres/nanorodsoxide–polyaniline compositecathodic peakscyclic voltammetryspecific capacitance |
| spellingShingle | Chrysanthi Gkili Konstantinos Deligiannakis Eirini Lappa Chrysanthi Papoulia Dimitra Sazou Electrodeposition of Polyaniline on Tantalum: Redox Behavior, Morphology and Capacitive Properties Molecules tantalum oxide polyaniline nanospheres/nanorods oxide–polyaniline composite cathodic peaks cyclic voltammetry specific capacitance |
| title | Electrodeposition of Polyaniline on Tantalum: Redox Behavior, Morphology and Capacitive Properties |
| title_full | Electrodeposition of Polyaniline on Tantalum: Redox Behavior, Morphology and Capacitive Properties |
| title_fullStr | Electrodeposition of Polyaniline on Tantalum: Redox Behavior, Morphology and Capacitive Properties |
| title_full_unstemmed | Electrodeposition of Polyaniline on Tantalum: Redox Behavior, Morphology and Capacitive Properties |
| title_short | Electrodeposition of Polyaniline on Tantalum: Redox Behavior, Morphology and Capacitive Properties |
| title_sort | electrodeposition of polyaniline on tantalum redox behavior morphology and capacitive properties |
| topic | tantalum oxide polyaniline nanospheres/nanorods oxide–polyaniline composite cathodic peaks cyclic voltammetry specific capacitance |
| url | https://www.mdpi.com/1420-3049/28/21/7286 |
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