Improvement of the Pseudocapacitive Performance of Cobalt Oxide-Based Electrodes for Electrochemical Capacitors
Cobalt oxide nanopowders are synthesized by the pyrolysis of aerosol particles of water solution of cobalt acetate. Cobalt nanopowder is obtained by subsequent reduction of obtained cobalt oxide by annealing under a hydrogen atmosphere. The average crystallite size of the synthesized porous particle...
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2020-10-01
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author | Mojtaba Mirzaeian Nazym Akhanova Maratbek Gabdullin Zhanar Kalkozova Aida Tulegenova Shyryn Nurbolat Khabibulla Abdullin |
author_facet | Mojtaba Mirzaeian Nazym Akhanova Maratbek Gabdullin Zhanar Kalkozova Aida Tulegenova Shyryn Nurbolat Khabibulla Abdullin |
author_sort | Mojtaba Mirzaeian |
collection | DOAJ |
description | Cobalt oxide nanopowders are synthesized by the pyrolysis of aerosol particles of water solution of cobalt acetate. Cobalt nanopowder is obtained by subsequent reduction of obtained cobalt oxide by annealing under a hydrogen atmosphere. The average crystallite size of the synthesized porous particles ranged from 7 to 30 nm, depending on the synthesis temperature. The electrochemical characteristics of electrodes based on synthesized cobalt oxide and reduced cobalt oxide are investigated in an electrochemical cell using a 3.5 M KOH solution as the electrolyte. The results of electrochemical measurements show that the electrode based on reduced cobalt oxide (Re-Co<sub>3</sub>O<sub>4</sub>) exhibits significantly higher capacity, and lower Faradaic charge–transfer and ion diffusion resistances when compared to the electrodes based on the initial cobalt oxide Co<sub>3</sub>O<sub>4</sub>. This observed effect is mainly due to a wide range of reversible redox transitions such as Co(II) ↔ Co(III) and Co(III) ↔ Co(IV) associated with different cobalt oxide/hydroxide species formed on the surface of metal particles during the cell operation; the small thickness of the oxide/hydroxide layer providing a high reaction rate, and also the presence of a metal skeleton leading to a low series resistance of the electrode. |
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id | doaj.art-082c84eb5f6f49cea388168562f72ab6 |
institution | Directory Open Access Journal |
issn | 1996-1073 |
language | English |
last_indexed | 2024-03-10T15:46:22Z |
publishDate | 2020-10-01 |
publisher | MDPI AG |
record_format | Article |
series | Energies |
spelling | doaj.art-082c84eb5f6f49cea388168562f72ab62023-11-20T16:21:39ZengMDPI AGEnergies1996-10732020-10-011319522810.3390/en13195228Improvement of the Pseudocapacitive Performance of Cobalt Oxide-Based Electrodes for Electrochemical CapacitorsMojtaba Mirzaeian0Nazym Akhanova1Maratbek Gabdullin2Zhanar Kalkozova3Aida Tulegenova4Shyryn Nurbolat5Khabibulla Abdullin6School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley PA1 2BE, UKNational Nanotechnology Laboratory of Open Type (NNLOT), Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty 050012, KazakhstanResearch Center of Renewable Energy and Nanotechnology, Kazakh-British Technical University University, Tole bi st. 59, Almaty 050000, KazakhstanNational Nanotechnology Laboratory of Open Type (NNLOT), Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty 050012, KazakhstanNational Nanotechnology Laboratory of Open Type (NNLOT), Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty 050012, KazakhstanNational Nanotechnology Laboratory of Open Type (NNLOT), Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty 050012, KazakhstanNational Nanotechnology Laboratory of Open Type (NNLOT), Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty 050012, KazakhstanCobalt oxide nanopowders are synthesized by the pyrolysis of aerosol particles of water solution of cobalt acetate. Cobalt nanopowder is obtained by subsequent reduction of obtained cobalt oxide by annealing under a hydrogen atmosphere. The average crystallite size of the synthesized porous particles ranged from 7 to 30 nm, depending on the synthesis temperature. The electrochemical characteristics of electrodes based on synthesized cobalt oxide and reduced cobalt oxide are investigated in an electrochemical cell using a 3.5 M KOH solution as the electrolyte. The results of electrochemical measurements show that the electrode based on reduced cobalt oxide (Re-Co<sub>3</sub>O<sub>4</sub>) exhibits significantly higher capacity, and lower Faradaic charge–transfer and ion diffusion resistances when compared to the electrodes based on the initial cobalt oxide Co<sub>3</sub>O<sub>4</sub>. This observed effect is mainly due to a wide range of reversible redox transitions such as Co(II) ↔ Co(III) and Co(III) ↔ Co(IV) associated with different cobalt oxide/hydroxide species formed on the surface of metal particles during the cell operation; the small thickness of the oxide/hydroxide layer providing a high reaction rate, and also the presence of a metal skeleton leading to a low series resistance of the electrode.https://www.mdpi.com/1996-1073/13/19/5228cobalt oxide nanoparticlesreduced cobalt oxidecore-shell nanoparticleselectrode materialsupercapacitor |
spellingShingle | Mojtaba Mirzaeian Nazym Akhanova Maratbek Gabdullin Zhanar Kalkozova Aida Tulegenova Shyryn Nurbolat Khabibulla Abdullin Improvement of the Pseudocapacitive Performance of Cobalt Oxide-Based Electrodes for Electrochemical Capacitors Energies cobalt oxide nanoparticles reduced cobalt oxide core-shell nanoparticles electrode material supercapacitor |
title | Improvement of the Pseudocapacitive Performance of Cobalt Oxide-Based Electrodes for Electrochemical Capacitors |
title_full | Improvement of the Pseudocapacitive Performance of Cobalt Oxide-Based Electrodes for Electrochemical Capacitors |
title_fullStr | Improvement of the Pseudocapacitive Performance of Cobalt Oxide-Based Electrodes for Electrochemical Capacitors |
title_full_unstemmed | Improvement of the Pseudocapacitive Performance of Cobalt Oxide-Based Electrodes for Electrochemical Capacitors |
title_short | Improvement of the Pseudocapacitive Performance of Cobalt Oxide-Based Electrodes for Electrochemical Capacitors |
title_sort | improvement of the pseudocapacitive performance of cobalt oxide based electrodes for electrochemical capacitors |
topic | cobalt oxide nanoparticles reduced cobalt oxide core-shell nanoparticles electrode material supercapacitor |
url | https://www.mdpi.com/1996-1073/13/19/5228 |
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