Efficient recovery annealing of the pseudocapacitive electrode with a high loading of cobalt oxide nanoparticles for hybrid supercapacitor applications

Khabibulla A. Abdullin*, Maratbek T. Gabdullin, Zhanar K. Kalkozova, Shyryn T. Nurbolat, Mojtaba Mirzaeian

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Electrochemical pseudocapacitors, along with batteries, are the essential components of today’s highly efficient energy storage systems. Cobalt oxide is widely developing for hybrid superca-pacitor pseudocapacitance electrode applications due to its wide range of redox reactions, high theoretical capacitance, low cost, and presence of electrical conductivity. In this work, a recovery annealing approach is proposed to modify the electrochemical properties of Co3O4 pseudocapac-itive electrodes. Cyclic voltammetry measurements indicate a predominance of surface-controlled redox reactions as a result of recovery annealing. X-ray diffraction, Raman spectra, and XPES re-sults showed that, due to the small size of cobalt oxide particles, low-temperature recovery causes the transformation of the Co3O4 nanocrystalline phase into the CoO phase. For the same reason, a rapid reverse transformation of CoO into Co3O4 occurs during in situ oxidation. This recrystal-lization enhances the electrochemical activity of the surface of nanoparticles, where a high con-centration of oxygen vacancies is observed in the resulting Co3O4 phase. Thus, a simple method of modifying nanocrystalline Co3O4 electrodes provides a much-improved pseudocapacitance characteristics.
Original languageEnglish
Article number3669
Number of pages18
JournalNanomaterials
Volume12
Issue number20
DOIs
Publication statusPublished - 19 Oct 2022

Keywords

  • supercapacitors
  • electrode materials
  • hybrid capacitors
  • energy storage devices

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