Publication: A comparative study of MnO2 and composite MnO2–Ag nanostructures prepared by a hydrothermal technique on supercapacitor applications
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Issued Date
2018
Resource Type
File Type
application/pdf
ISSN
9574522
Other identifier(s)
2-s2.0-85044440304
Rights Holder(s)
Scopus
Bibliographic Citation
Journal of Materials Science: Materials in Electronics. Vol 29, No.11 (2018), p.9406-9417
Suggested Citation
Phakkhawan A., Klangtakai P., Chompoosor A., Pimanpang S., Amornkitbamrung V. A comparative study of MnO2 and composite MnO2–Ag nanostructures prepared by a hydrothermal technique on supercapacitor applications. Journal of Materials Science: Materials in Electronics. Vol 29, No.11 (2018), p.9406-9417. doi:10.1007/s10854-018-8973-8 Retrieved from: https://hdl.handle.net/20.500.14740/4483
Abstract
Pure MnO2 and composite MnO2–Ag electrodes with four different structures were synthesized via a hydrothermal process. Tube, urchin, rod and wire/sphere-like structures were obtained from the addition of HCl, H2SO4, (NH4)2S2O8 or CO(NH2)2 reagents into potassium permanganate solutions, respectively. The crystal structure of the MnO2 particles was examined using X-ray diffraction and transmission electron microscopy, revealing an α-phase MnO2. Specific capacitance values of 74.5, 111.7, 103.4 and 204.1 F g−1 at a charge/discharge current density of 0.3 A g−1 were obtained for tube, urchin, rod and wire/sphere-like pure MnO2 structures, respectively. The wire/sphere-like structure delivered the highest specific capacitance owing to its largest specific surface area (164.60 m2 g−1). The specific capacitances were further increased to 96.6, 210.9 and 186.4 F g−1, respectively, for tube, urchin and rod-like structures after Ag addition. Additionally, the capacitance retention of the rod and wire/sphere-like composite MnO2–Ag films were also prolonged because Ag nanoparticles prevented the aggregation and/or decomposition of MnO2. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.
Subject(s)
Ammonium persulfate
Capacitance
Chlorine compounds
Crystal structure
High resolution transmission electron microscopy
Manganese oxide
Nanocomposite films
Potash
Silver nanoparticles
Supercapacitor
Transmission electron microscopy
Wire
X ray diffraction
Capacitance retention
Comparative studies
Hydrothermal process
Hydrothermal techniques
Potassium permanganate
Rod-like structures
Specific capacitance
Supercapacitor application
Silver compounds
Capacitance
Chlorine compounds
Crystal structure
High resolution transmission electron microscopy
Manganese oxide
Nanocomposite films
Potash
Silver nanoparticles
Supercapacitor
Transmission electron microscopy
Wire
X ray diffraction
Capacitance retention
Comparative studies
Hydrothermal process
Hydrothermal techniques
Potassium permanganate
Rod-like structures
Specific capacitance
Supercapacitor application
Silver compounds