Publication: Electrochemical mechanisms of activated carbon, α-MnO2 and composited activated carbon-α-MnO2 films in supercapacitor applications
0
0
Issued Date
2021
Resource Type
Language
eng
File Type
application/pdf
ISSN
1694332
Other identifier(s)
2-s2.0-85114519173
Rights Holder(s)
มหาวิทยาลัยศรีนครินทรวิโรฒ
Bibliographic Citation
Applied Surface Science. Vol 570, No. (2021)
Suggested Citation
Tagsin P., Suksangrat P., Klangtakai P., Srepusharawoot P., Ruttanapun C., Kumnorkaew P., Pimanpang S., Amornkitbamrung V. Electrochemical mechanisms of activated carbon, α-MnO2 and composited activated carbon-α-MnO2 films in supercapacitor applications. Applied Surface Science. Vol 570, No. (2021). doi:10.1016/j.apsusc.2021.151056 Retrieved from: https://hdl.handle.net/20.500.14740/13584
Abstract
Pure α-MnO2 and activated carbon-MnO2 (AC-MnO2) films coated on Ni foam by electrophoretic deposition were applied as a supercapacitor electrode. The specific capacitance of AC-MnO2 films (155.03 F g−1) surpasses those of the pure AC (110.62 F g−1) and pure MnO2 film in the 1 M NaOH electrolyte. EDX and XPS detect an increase in the Na content and the reduction of Mn4+ to Mn3+ on the discharged MnO2 electrode (at 0.0 V), whereas a decrease in the Na content and the oxidation of Mn3+ to Mn4+ were obtained on the charged MnO2 electrode (at 0.45 V). Computational simulation of the Na inserted α-MnO2 structure displays the connection of Na to O atoms and the increasing electron density on Mn atoms. EDX of the charged AC-MnO2 (at −1.0 V) film detects a rise in the Na and a fall in the O contents, but the discharged AC-MnO2 film (at 0.0 V) shows a decrease in Na and increase in O contents. The AC-MnO2 film could retain 82.29% of the initial specific capacity after 10,000 cycles. Four series-supercapacitor coin cell assembled from the AC-MnO2 anode and MnO2 cathode delivers a power density of 2.79 kW kg−1 and an energy density of 168.8 Wh kg−1. © 2021 Elsevier B.V.
Subject(s)
Activated carbon
Carbon films
Deposition
Electrodes
Electrolytes
Electrophoresis
Foams
Sodium
Sodium hydroxide
Supercapacitor
Composited
Electrochemical mechanisms
Electrophoretic
Electrophoretic depositions
MnO 2
MnO 2 films
Na content
Ni foam
Supercapacitor application
Supercapacitor electrodes
Manganese oxide
Carbon films
Deposition
Electrodes
Electrolytes
Electrophoresis
Foams
Sodium
Sodium hydroxide
Supercapacitor
Composited
Electrochemical mechanisms
Electrophoretic
Electrophoretic depositions
MnO 2
MnO 2 films
Na content
Ni foam
Supercapacitor application
Supercapacitor electrodes
Manganese oxide