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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Main Authors: Mojtaba Mirzaeian, Nazym Akhanova, Maratbek Gabdullin, Zhanar Kalkozova, Aida Tulegenova, Shyryn Nurbolat, Khabibulla Abdullin
Format: Article
Language:English
Published: MDPI AG 2020-10-01
Series:Energies
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Online Access:https://www.mdpi.com/1996-1073/13/19/5228
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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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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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AT maratbekgabdullin improvementofthepseudocapacitiveperformanceofcobaltoxidebasedelectrodesforelectrochemicalcapacitors
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