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The evaluation of the electrochemical properties of Co3O4 nanopowders synthesized by autocombustion and sol–gel methods

S. Kalpana, Vinay S. Bhat, G. Hegde, T. Niranjana Prabhu, and P. N. Anantharamaiah

Department of Chemistry, Faculty of Mathematical and Physical Sciences, M. S. Ramaiah University of Applied Sciences, Bangalore, India



Received: 5 June 2023  Accepted: 15 September 2023


The present investigation involves two synthesis methods, autocombustion (Co3O4-AC) and sol–gel (Co3O4-SG), for producing nearly spherical-shaped and polygonal shaped nanomaterials of spinel cobalt oxide (Co3O4) respectively as electrode materials. TEM image analysis unveiled distinct particle morphologies for the two samples. The Co3O4-AC particles exhibited a nearly spherical shape, whereas the Co3O4-SG particles displayed a polygonal shape. The phase purity of the Co3O4 samples were confirmed via XRD patterns analysis and the crystallite size was calculated to be 44 nm for Co3O4-AC and 36 nm for Co3O4-SG. The surface area, estimated via BET experiments, of Co3O4-AC was found to be 15 m2/g, while Co3O4-SG exhibited a slightly lower surface area of 11 m2/g. Co3O4-AC exhibited a higher specific capacitance (Cs) of 162 F/g at 0.25 A/g, indicating its superior energy storage capability. On the other hand, Co3O4-SG shows a Cs of 98 F/g, indicating slightly lower performance compared to Co3O4-AC. Both nanomaterials exhibited better stability, with more than 85% capacity retention after 5000 charge–discharge cycles.

Keywords: Co3O4; Autocombustion; Sol–gel; CV; GCD; Cycle stability

Full paper is available at

DOI: 10.1007/s11696-023-03093-8


Chemical Papers 78 (1) 343–356 (2024)

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