Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO 2 Thin-Film Supercapacitors Synthesized by the Hydrothermal Method

Aviraj M. Teli, Sonali A. Beknalkar, Sachin A. Pawar, Deepak P. Dubal, Tukaram D. Dongale, Dipali S. Patil, Pramod S. Patil and Jae Cheol Shin
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Aviraj M. Teli: Department of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea
Sonali A. Beknalkar: Department of Physics, Shivaji University, Kolhapur 416004, Maharashtra, India
Sachin A. Pawar: Department of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea
Deepak P. Dubal: School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane QLD 4001, Australia
Tukaram D. Dongale: School of Nanoscience and Biotechnology, Shivaji University, Kolhapur 416004, Maharashtra, India
Dipali S. Patil: Department of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea
Pramod S. Patil: Department of Physics, Shivaji University, Kolhapur 416004, Maharashtra, India
Jae Cheol Shin: Department of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea

Energies, 2020, vol. 13, issue 22, 1-18

Abstract: In this study, amorphous manganese oxide (MnO 2 ) nanostructured thin films were synthesized by a simple hydrothermal method. It is well known that the nanostructure plays a crucial role in energy storage applications. Herein, MnO 2 nanostructures ranging from plates to flakes were synthesized without the use of any hard or soft templates. The 4+ oxidation state of Mn was confirmed by X-ray photoelectron spectroscopy. The MnO 2 nanoflake structure has a specific surface area of 46 m 2 g −1 , which provides it with an excellent rate capability and an exactly rectangular cyclic voltammogram (CV) curve. The MnO 2 nanoflake electrode has a high specific capacitance of about 433 Fg −1 , an energy density of 60 Whkg −1 at 0.5 mAcm −2 , and an excellent cyclic stability of 95% over 1000 CV cycles in 1 M aq. Na 2 SO 4 . Kinetics analysis of the charge storage in the nanoflake MnO 2 sample shows a 55.6% diffusion-controlled contribution and 44.4% capacitive-controlled contribution to the total current calculated at a scan rate of 100 mVs −1 from the CV curve.

Keywords: MnO 2 nanoflakes; hydrothermal; charge storage kinetic analysis; specific surface area; supercapacitive performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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