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. 2023 Jan 31;9(2):e13286.
doi: 10.1016/j.heliyon.2023.e13286. eCollection 2023 Feb.

Ag doped Co3O4 nanoparticles for high-performance supercapacitor application

Asab Fetene Alem  1 , Ababay Ketema Worku  1 , Delele Worku Ayele  1   2 , Tessera Alemneh Wubieneh  3 , Alebel Abebaw Teshager  4 , Tadele Mihret Kndie  4 , Bimrew Tamrat Admasu  5 , Minbale Admas Teshager  2 , Addisu Alemayehu Asege  3 , Mehary Dagnew Ambaw  6 , Misganaw Alemu Zeleke  3 , Alemayehu Kifle Shibesh  4 , Temesgen Atnafu Yemata  4
Affiliations

Ag doped Co3O4 nanoparticles for high-performance supercapacitor application

Asab Fetene Alem et al. Heliyon. .

Abstract

Ag doped Co3O4 nanoparticles (NPs) were synthesized via a co-precipitation method changing the concentration of Ag. The crystal structure, morphology, surface area, functional group, optical band gap, and thermal property were investigated by XRD, SEM, BET, FTIR, UV-Vis, and TGA/DTA techniques. The XRD results showed the formation of single-cubic Co3O4 nanostructured materials with an average crystal size of 19.37 nm and 12.98 nm for pristine Co3O4 and 0.25 M Ag-doped Co3O4 NPs. Morphological studies showed that pristine Co3O4 and 0.25 M Ag-doped Co3O4 NPs having a porous structure with small spherical grains, porous structures with sponge-like structures, and loosely packed porous structures, respectively. The pristine and 0.25 M Ag-doped Co3O4 NPs showed BET surface areas of 53.06 m2/g, and 407.33 m2/g, respectively. The band gap energy of Co3O4 NPs were 2.96 eV, with additional sub-bandgap energy of 1.95 eV. Additionally, it was discovered that the band gap energies of 0.25 M Ag-doped Co3O4 NPs ranged from 2.2 to 2.75 eV, with an extra sub-band with energies ranging from 1.43 to 1.94 eV for all as-prepared samples. The Ag-doped Co3O4 as prepared samples show improved thermal properties due to the doping effect of silver. The CV test confirmed that the 0.25 M Ag-doped Co3O4 NPs exhibited the highest specific capacitance value of 992.7 F/g at 5 mV/s in a 0.1 M KOH electrolyte solution. The energy density and power density of 0.25 M Ag-doped Co3O4 NPs were 27.9 W h/kg and 3816.1 W/kg, respectively.

Keywords: Co-precipitation method; Cobalt oxide; Doping; Nanoparticles; Supercapacitor.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1
Fig. 1
Synthesis of Ag-doped Co3O4 nanostructured materials by Co-precipitation method.
Fig. 2
Fig. 2
XRD pattern of (a) Pristine Co3O4 nanostructured materials, and (b) 0.25 M Ag-doped Co3O4 NPs.
Fig. 3
Fig. 3
SEM images of (a) Pristine nanostructured materials at 10 μm, (b) Pristine nanostructured materials at 20 μm, (c) 0.25 M Ag-doped Co3O4 nanostructured materials at 10 μm, and (d) 0.25 M Ag-doped Co3O4 nanostructured materials at 20 μm.
Fig. 4
Fig. 4
FTIR spectra of Co3O4, Ag-doped Co3O4 (0.05 M), Ag-doped Co3O4 (0.1 M), Ag- doped Co3O4 (0.15 M), Ag-doped Co3O4 (0.2 M), Ag-doped Co3O4 (0.25 M) NPs.
Fig. 5
Fig. 5
UV–Vis spectrum of Co3O4, Ag-doped Co3O4 (0.05 M), Ag-doped Co3O4 (0.1 M), Ag-doped Co3O4 (0.15 M), Ag-doped Co3O4 (0.2 M) and Ag-doped Co3O4 (0.25 M) NPs.
Fig. 6
Fig. 6
Tauc plot Bandgap energy of (a) pristine, (b) Ag-doped Co3O4 (0.05 M), (c) Ag- doped Co3O4 (0.1 M), (d) Ag- doped Co3O4 (0.15 M), (e) Ag-doped Co3O4 (0.2 M), (f) Ag -doped Co3O4 (0.25 M) NPs.
Fig. 7
Fig. 7
TGA and DTA curve of (a) Co3O4 nanostructured materials, (b) Ag-doped Co3O4 (0.05 M) nanostructured materials, and (c) Ag-doped Co3O4 (0.25 M) NPs.
Fig. 8
Fig. 8
CV Curve of (a) Co3O4 and 0.25 M Ag-doped Co3O4 nanostructured materials at 50 mV/s, (b) Co3O4 nanostructured materials at different scan rates, and (c) 0.25 M Ag-doped Co3O4 nanostructured materials at different scan rates.
Fig. 9
Fig. 9
The values of specific capacitance versus scan rate for pristine Co3O4, and 0.25 M Ag-doped Co3O4 NPs.
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