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Facile synthesis and properties of chromium-doped cobalt oxide (Cr-doped Co3O4) nanostructures for supercapacitor applications

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Abstract

Chromium-doped cobalt oxide (Crx-doped Co3O4x = 1–10 at%) nanoflowers were synthesized by a facile hydrothermal method. The structure, morphology, composition, and optical properties were analyzed with X-ray powder diffraction, scanning electron microscopy, energy-dispersive X-ray, and photoluminescence spectroscopy. The electrochemical properties of the chromium-doped cobalt oxide (Crx-doped Co3O4x = 1–10 at%) nanoflowers were measured by cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy in 3 M KOH electrolyte. The 6 at% Cr-doped Co3O4 sample has demonstrated 1283 Fg−1 specific capacitance at 5 mV/s scan rate which is 67% more than pristine Co3O4 having specific capacitance 860.56 Fg−1. Moreover, it has presented outstanding specific capacitance retention of 72.86% after 1000 continuous charge–discharge cycles. These excellent electrochemical properties of 6 at% chromium-doped cobalt oxide (Crx-doped Co3O4x = 6 at%) nanoflowers showed that it is promising material for supercapacitor applications.

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Correspondence to N. R. Khalid.

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Ali, F., Khalid, N.R. Facile synthesis and properties of chromium-doped cobalt oxide (Cr-doped Co3O4) nanostructures for supercapacitor applications. Appl Nanosci (2020). https://doi.org/10.1007/s13204-020-01266-5

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Keywords

  • Crx-doped Co3O4 (where x = 1–10 at%)
  • Nanoflowers
  • Hydrothermal synthesis method
  • Electrochemical properties