Enhancing the Electrochemical Performance of ZnO-Co 3 O 4 and Zn-Co-O Supercapacitor Electrodes Due to the In Situ Electrochemical Etching Process and the Formation of Co 3 O 4 Nanoparticles

Khabibulla Abdullin, Maratbek Gabdullin, Zhanar Kalkozova (), Vladislav Kudryashov, Mojtaba Mirzaeian (), Kassym Yelemessov, Dinara Baskanbayeva and Abay Serikkanov
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Khabibulla Abdullin: National Nanotechnology Laboratory of Open Type (NNLOT), Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty 050040, Kazakhstan
Maratbek Gabdullin: Kazakh-British Technical University, Tole bi Street, 59, Almaty 050000, Kazakhstan
Zhanar Kalkozova: National Nanotechnology Laboratory of Open Type (NNLOT), Al-Farabi Kazakh National University, Al-Farabi Avenue 71, Almaty 050040, Kazakhstan
Vladislav Kudryashov: Lab of Renewable Energy, National Laboratory Astana, Nazarbayev University, Astana 010000, Kazakhstan
Mojtaba Mirzaeian: School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley PA1 2BE, UK
Kassym Yelemessov: Institute of Energy and Mechanical Engineering named after A. Burkitbayev, Satbayev University, 22 Satbaev Str., Almaty 050013, Kazakhstan
Dinara Baskanbayeva: Institute of Energy and Mechanical Engineering named after A. Burkitbayev, Satbayev University, 22 Satbaev Str., Almaty 050013, Kazakhstan
Abay Serikkanov: Satbayev University, Institute of Physics and Technology, Almaty 050013, Kazakhstan

Energies, 2024, vol. 17, issue 8, 1-20

Abstract: Zinc oxide (ZnO) and materials based on it are often used to create battery-type supercapacitor electrodes and are considered as promising materials for hybrid asymmetric supercapacitors. However, when creating such electrodes, it is necessary to take into account the instability and degradation of zinc oxide in aggressive environments with a non-neutral pH. To the best of our knowledge, studies of the changes in the properties of ZnO-containing electrodes in alkaline electrolytes have not been carried out. In this work, changes in the structure and properties of these electrodes under alkaline treatment were investigated using the example of ZnO-containing composites, which are often used for the manufacturing of supercapacitor electrodes. Supercapacitor electrodes made of two materials containing ZnO were studied: (i) a heterogeneous ZnO-Co 3 O 4 system, and (ii) a hexagonal h-Zn-Co-O solid solution. A comparison was made between the structure and properties of these materials before and after in situ electrochemical oxidation in the process of measuring cyclic voltammetry and galvanostatic charge/discharge. It has been shown that the structure of both nanoparticles of the heterogeneous ZnO-Co 3 O 4 system and the h-Zn-Co-O solid solution changes due to the dissolution of ZnO in the alkaline electrolyte 3.5 M KOH, with the short-term alkaline treatment producing cobalt and zinc hydroxides, and long-term exposure leading to electrochemical cyclic oxidation–reduction, forming cobalt oxide Co 3 O 4 . Since the resulting cobalt oxide nanoparticles are immobilized in the electrode structure, a considerable specific capacity of 446 F g −1 or 74.4 mA h g −1 is achieved at a mass loading of 0.0105 g. The fabricated hybrid capacitor showed a good electrochemical performance, with a series resistance of 0.2 Ohm and a capacitance retention of 87% after 10,000 cycles.

Keywords: supercapacitor electrode; ZnO-based composite; cobalt oxide nanoparticles (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: 2024
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