Electrochemical performance evaluation of ZnCo2O4 nanoflakes for hybrid supercapacitors

Original scientific paper

Authors

  • Deependra Jhankal Department of Physics, Malaviya National Institute of Technology, Jaipur 302017, India and Department of Physics, School of Applied Science, Suresh Gyan Vihar University, Jaipur, 302017 India https://orcid.org/0000-0002-6008-4424
  • Bhanu Yadav Department of Physics, Malaviya National Institute of Technology, Jaipur 302017, India https://orcid.org/0009-0003-9936-3118
  • Preeti Shakya Materials Research Centre, Malaviya National Institute of Technology, Jaipur 302017, India https://orcid.org/0000-0002-9869-6194
  • Mohammed Saquib Khan Department of Sustainable Energy Engineering, Indian Institute of Technology, Kanpur 208016 India https://orcid.org/0000-0002-1418-1549
  • Krishna Kumar Jhankal Department of Chemistry, University of Rajasthan, Jaipur 302004, India https://orcid.org/0000-0003-2779-2354
  • Kanupriya Sachdev Department of Physics, Malaviya National Institute of Technology, Jaipur 302017, India and Materials Research Centre, Malaviya National Institute of Technology, Jaipur 302017, India https://orcid.org/0000-0002-1942-2452

DOI:

https://doi.org/10.5599/jese.2621

Keywords:

Bimetal oxide, sol-gel synthesis, specific capacitance, cyclic stability

Abstract

This study focuses on the synthesis and characterization of zinc cobaltite (ZnCo2O4) as an electrode material for supercapacitor (SC) applications. ZnCo2O4 was synthesized via an efficient sol-gel method, followed by annealing. Morphological and structural character­ri­za­tions revealed that ZnCo2O4 forms as nanoflakes with a well-crystallized structure. Electro­chemical parameters of ZnCo2O4 were examined by various electrochemical techniques in a 3 M KOH aqueous electrolyte. The highest specific capacitance (Csp) of 321 F g-1 was obtained at a current density of 0.8 A g-1. The electrochemical performance of the ZnCo2O4 electrode is superior, owing to its porous nanoflake morphology, which provides numerous active sites and enables substantial charge storage. Moreover, multiple oxidation states of Zn and Co enhance redox reactions at the electrode surface, thereby improving the electrode's pseudocapa­citance. The superior electrochemical performance of ZnCo2O4 indicates that it is a promising cathode material for hybrid SC devices.

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Published

28-12-2025

Issue

Vol. 16 (2026)

Section

Batteries and supercapacitors

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Copyright (c) 2025 Deependra Jhankal, Bhanu Yadav , Preeti Shakya , Mohammed Saquib Khan, Krishna Kumar Jhankal, Kanupriya Sachdev

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This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Electrochemical performance evaluation of ZnCo2O4 nanoflakes for hybrid supercapacitors: Original scientific paper. (2025). Journal of Electrochemical Science and Engineering, 16, Article 2621. https://doi.org/10.5599/jese.2621

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