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

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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Main Authors: Aviraj M. Teli, Sonali A. Beknalkar, Sachin A. Pawar, Deepak P. Dubal, Tukaram D. Dongale, Dipali S. Patil, Pramod S. Patil, Jae Cheol Shin
Format: Article
Language:English
Published: MDPI AG 2020-11-01
Series:Energies
Subjects:
MnO<sub>2</sub> nanoflakes
hydrothermal
charge storage kinetic analysis
specific surface area
supercapacitive performance
Online Access:https://www.mdpi.com/1996-1073/13/22/6124
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spelling 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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