Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO<sub>2</sub> Thin-Film Supercapacitors Synthesized by the Hydrothermal Method
In this study, amorphous manganese oxide (MnO<sub>2</sub>) 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<sub>2</sub> nanostructures ranging f...
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doaj-2dae92c179e94d5c8d7a2ea9880088462020-11-25T04:03:47ZengMDPI AGEnergies1996-10732020-11-01136124612410.3390/en13226124Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO<sub>2</sub> Thin-Film Supercapacitors Synthesized by the Hydrothermal MethodAviraj M. Teli0Sonali A. Beknalkar1Sachin A. Pawar2Deepak P. Dubal3Tukaram D. Dongale4Dipali S. Patil5Pramod S. Patil6Jae Cheol Shin7Department of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, KoreaDepartment of Physics, Shivaji University, Kolhapur 416004, Maharashtra, IndiaDepartment of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, KoreaSchool of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4001, AustraliaSchool of Nanoscience and Biotechnology, Shivaji University, Kolhapur 416004, Maharashtra, IndiaDepartment of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, KoreaDepartment of Physics, Shivaji University, Kolhapur 416004, Maharashtra, IndiaDepartment of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, KoreaIn this study, amorphous manganese oxide (MnO<sub>2</sub>) 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<sub>2</sub> 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<sub>2</sub> nanoflake structure has a specific surface area of 46 m<sup>2</sup>g<sup>−1</sup>, which provides it with an excellent rate capability and an exactly rectangular cyclic voltammogram (CV) curve. The MnO<sub>2</sub> nanoflake electrode has a high specific capacitance of about 433 Fg<sup>−1</sup>, an energy density of 60 Whkg<sup>−1</sup> at 0.5 mAcm<sup>−2</sup>, and an excellent cyclic stability of 95% over 1000 CV cycles in 1 M aq. Na<sub>2</sub>SO<sub>4</sub>. Kinetics analysis of the charge storage in the nanoflake MnO<sub>2</sub> 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<sup>−1 </sup>from the CV curve.https://www.mdpi.com/1996-1073/13/22/6124MnO<sub>2</sub> nanoflakeshydrothermalcharge storage kinetic analysisspecific surface areasupercapacitive performance |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Aviraj M. Teli Sonali A. Beknalkar Sachin A. Pawar Deepak P. Dubal Tukaram D. Dongale Dipali S. Patil Pramod S. Patil Jae Cheol Shin |
spellingShingle |
Aviraj M. Teli Sonali A. Beknalkar Sachin A. Pawar Deepak P. Dubal Tukaram D. Dongale Dipali S. Patil Pramod S. Patil Jae Cheol Shin Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO<sub>2</sub> Thin-Film Supercapacitors Synthesized by the Hydrothermal Method Energies MnO<sub>2</sub> nanoflakes hydrothermal charge storage kinetic analysis specific surface area supercapacitive performance |
author_facet |
Aviraj M. Teli Sonali A. Beknalkar Sachin A. Pawar Deepak P. Dubal Tukaram D. Dongale Dipali S. Patil Pramod S. Patil Jae Cheol Shin |
author_sort |
Aviraj M. Teli |
title |
Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO<sub>2</sub> Thin-Film Supercapacitors Synthesized by the Hydrothermal Method |
title_short |
Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO<sub>2</sub> Thin-Film Supercapacitors Synthesized by the Hydrothermal Method |
title_full |
Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO<sub>2</sub> Thin-Film Supercapacitors Synthesized by the Hydrothermal Method |
title_fullStr |
Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO<sub>2</sub> Thin-Film Supercapacitors Synthesized by the Hydrothermal Method |
title_full_unstemmed |
Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO<sub>2</sub> Thin-Film Supercapacitors Synthesized by the Hydrothermal Method |
title_sort |
effect of concentration on the charge storage kinetics of nanostructured mno<sub>2</sub> thin-film supercapacitors synthesized by the hydrothermal method |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2020-11-01 |
description |
In this study, amorphous manganese oxide (MnO<sub>2</sub>) 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<sub>2</sub> 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<sub>2</sub> nanoflake structure has a specific surface area of 46 m<sup>2</sup>g<sup>−1</sup>, which provides it with an excellent rate capability and an exactly rectangular cyclic voltammogram (CV) curve. The MnO<sub>2</sub> nanoflake electrode has a high specific capacitance of about 433 Fg<sup>−1</sup>, an energy density of 60 Whkg<sup>−1</sup> at 0.5 mAcm<sup>−2</sup>, and an excellent cyclic stability of 95% over 1000 CV cycles in 1 M aq. Na<sub>2</sub>SO<sub>4</sub>. Kinetics analysis of the charge storage in the nanoflake MnO<sub>2</sub> 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<sup>−1 </sup>from the CV curve. |
topic |
MnO<sub>2</sub> nanoflakes hydrothermal charge storage kinetic analysis specific surface area supercapacitive performance |
url |
https://www.mdpi.com/1996-1073/13/22/6124 |
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