Enhanced specific capacitance of an electrophoretic deposited MnO2-carbon nanotube supercapacitor
MnO 2 and MnO 2 -carbon nanotubes (CNT) composite films were grown directly on stainless- steel substrates using an electrophoretic process employing supercapacitor electrodes. An electrophoretic MnO 2 film with a nanoplate-like structure was observed using scanning electron microscopy (SEM) and tra...
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Veröffentlicht in: | Journal of the Korean Physical Society 2017, 71(12), , pp.997-1005 |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | MnO
2
and MnO
2
-carbon nanotubes (CNT) composite films were grown directly on stainless- steel substrates using an electrophoretic process employing supercapacitor electrodes. An electrophoretic MnO
2
film with a nanoplate-like structure was observed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Supercapacitor performance was studied using cyclic voltammetry (CV), charge-discharge (CD) and electrochemical impedance spectroscopy (EIS). The specific capacitance (SC) of the electrophoretic MnO
2
film was 60 F/g at 1 A/g, with a 38.33% retention of the initial SC values after 1000 cycles. The low SC value of the MnO2 films was attributed to the high series and charge-transfer resistances of 1.70 Ω and 3.20, respectively. The MnO
2
-CNT composites with the addition of 0.04, 0.06 and 0.08 g CNT to the electrophoretic MnO
2
film were found to greatly increase the SC to 300, 206 and 169 F/g at 1 A/g, respectively. The series and charge-transferred resistances of MnO
2
-CNT composite films decreased to 1.38 - 1.52 Ω and 2.62 - 2.86 Ω, respectively. The SC improvement of the composite electrodes was attributed to presence of two active storage materials (MnO
2
and CNT), a high film specific surface area and electrical conductivity. |
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ISSN: | 0374-4884 1976-8524 |
DOI: | 10.3938/jkps.71.997 |