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. 2023 Feb 17;9(3):e13817.
doi: 10.1016/j.heliyon.2023.e13817. eCollection 2023 Mar.

Enhancing pseudocapacitive properties of cobalt oxide hierarchical nanostructures via iron doping

Asab Fetene Alem  1 , Ababay Ketema Worku  1 , Delele Worku Ayele  1   2 , Nigus Gabbiye Habtu  3 , Mehary Dagnew Ambaw  4 , Temesgen Atnafu Yemata  3
Affiliations

Enhancing pseudocapacitive properties of cobalt oxide hierarchical nanostructures via iron doping

Asab Fetene Alem et al. Heliyon. .

Abstract

Through co-precipitation and post-heat processing, nanostructured Fe-doped Co3O4 nanoparticles (NPs) were developed. Using the SEM, XRD, BET, FTIR, TGA/DTA, UV-Vis, and techniques were examined. The XRD analysis presented that Co3O4 and Co3O4 nanoparticles that had been doped with 0.25 M Fe formed single cubic phase Co3O4 NPs with average crystallite sizes of 19.37 nm and 14.09 nm, respectively. The as prepared NPs have porous architectures via SEM analyses. The BET surface areas of Co3O4 and 0.25 M Fe-doped Co3O4 NPs were 53.06 m2/g and 351.56 m2/g, respectively. Co3O4 NPs have a band gap energy of 2.96 eV and an extra sub-band gap energy of 1.95 eV. Fe-doped Co3O4 NPs were also found to have band gap energies between 2.54 and 1.46 eV. FTIR spectroscopy was used to determine whether M-O bonds (M = Co, Fe) were present. The doping impact of iron results in the doped Co3O4 samples having better thermal characteristics. The highest specific capacitance was achieved using 0.25 M Fe-doped Co3O4 NPs at 5 mV/s, which corresponding to 588.5 F/g via CV analysis. Additionally, 0.25 M Fe-doped Co3O4 NPs had energy and power densities of 9.17 W h/kg and 472.1 W/kg, correspondingly.

Keywords: Co-precipitation method; Cobalt oxide nanoparticles; Iron; Supercapacitor.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1
Fig. 1
Preparation of Fe-doped Co3O4 NPs using co-precipitation technique.
Fig. 2
Fig. 2
XRD pattern of (a) Pure Co3O4 nanoparticles, and (b) 0.25 M Fe-doped Co3O4 NPs.
Fig. 3
Fig. 3
SEM pictures of (a) Pure Co3O4 nanoparticles at 20 μm (b) 0.25 M Fe-doped Co3O4 NPs at 10 μm.
Fig. 4
Fig. 4
FTIR spectra of Co3O4, Fe-doped Co3O4 (0.05 M), Fe-doped Co3O4 (0.1 M), Fe-doped Co3O4 (0.15 M), Fe-doped Co3O4 (0.2 M), Fe-doped Co3O4 (0.25 M) NPs.
Fig. 5
Fig. 5
UV–Visible spectrum of Co3O4, Fe-doped Co3O4 (0.05 M), Fe-doped Co3O4 (0.1 M), Fe-doped Co3O4 (0.15 M), Fe-doped Co3O4 (0.2 M) and Fe-doped Co3O4 (0.25 M) NPs.
Fig. 6
Fig. 6
Tauc plot of (a) pure Co3O4, (b) Fe-doped Co3O4 (0.05 M), (c) Fe-doped Co3O4 (0.1 M), (d) Fe-doped Co3O4 (0.15 M), (e) Fe-doped Co3O4 (0.2 M), (f) Fe -doped Co3O4 (0.25 M) nanoparticles.
Fig. 7
Fig. 7
TGA and DTA curve of (a) Co3O4 nanoparticles, (b) Fe-doped Co3O4 (0.05 M) nanoparticles, (c) Fe-doped Co3O4 (0.1 M) nanoparticles, (d) Fe-doped Co3O4 (0.15 M) nanoparticles.
Fig. 8
Fig. 8
CV Curve of (a) Co3O4 and 0.25 M Fe-doped Co3O4 nanoparticles at 50 mV/s nanoparticles at different scan rates, (b) Co3O4 nanoparticles at different scan rates, and (c) 0.25 M Fe-doped Co3O4 nanoparticles at different scan rates.
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