Publication: Enhanced specific capacitance of an electrophoretic deposited MnO2-carbon nanotube supercapacitor
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Issued Date
2017
Resource Type
File Type
application/pdf
ISSN
3744884
Other identifier(s)
2-s2.0-85039453684
Rights Holder(s)
Scopus
Bibliographic Citation
Journal of the Korean Physical Society. Vol 71, No.12 (2017), p.997-1005
Suggested Citation
Tagsin P., Klangtakai P., Harnchana V., Amornkitbamrung V., Pimanpang S., Kumnorkaew P. Enhanced specific capacitance of an electrophoretic deposited MnO2-carbon nanotube supercapacitor. Journal of the Korean Physical Society. Vol 71, No.12 (2017), p.997-1005. doi:10.3938/jkps.71.997 Retrieved from: https://hdl.handle.net/20.500.14740/3988
Abstract
MnO2 and MnO2-carbon nanotubes (CNT) composite films were grown directly on stainless- steel substrates using an electrophoretic process employing supercapacitor electrodes. An electrophoretic MnO2 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 MnO2 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 MnO2-CNT composites with the addition of 0.04, 0.06 and 0.08 g CNT to the electrophoretic MnO2 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 MnO2-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 (MnO2 and CNT), a high film specific surface area and electrical conductivity. © 2017, The Korean Physical Society.