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

4 Citations (Scopus)
11 Downloads (Pure)

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 supercapacitor 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 Co 3O 4 pseudocapacitive 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 results showed that due to the small size of cobalt oxide particles, low-temperature recovery causes the transformation of the Co 3O 4 nanocrystalline phase into the CoO phase. For the same reason, a rapid reverse transformation of CoO into Co 3O 4 occurs during in situ oxidation. This recrystallization enhances the electrochemical activity of the surface of nanoparticles, where a high concentration of oxygen vacancies is observed in the resulting Co 3O 4 phase. Thus, a simple method of modifying nanocrystalline Co 3O 4 electrodes provides 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

Fingerprint

Dive into the research topics of 'Efficient recovery annealing of the pseudocapacitive electrode with a high loading of cobalt oxide nanoparticles for hybrid supercapacitor applications'. Together they form a unique fingerprint.

Cite this