Enhancing pseudocapacitive properties of cobalt oxide hierarchical nanostructures via iron doping

Asab Fetene Alem; Ababay Ketema Worku; Delele Worku Ayele; Nigus Gabbiye Habtu; Mehary Dagnew Ambaw; Temesgen Atnafu Yemata

doi:10.1016/j.heliyon.2023.e13817

Enhancing pseudocapacitive properties of cobalt oxide hierarchical nanostructures via iron doping

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

Authors

Asab Fetene Alem¹, Ababay Ketema Worku¹, Delele Worku Ayele^{1

2}, Nigus Gabbiye Habtu³, Mehary Dagnew Ambaw⁴, Temesgen Atnafu Yemata³

Affiliations

¹ Bahir Dar Energy Center, Bahir Dar Institute of Technology, Bahir Dar University, Bahir Dar, P.O. Box 26, Ethiopia.
² Department of Chemistry, College of Science, Bahir Dar University, P.O. Box 79, Bahir Dar, Ethiopia.
³ Faculty of Chemical and Food Engineering, Bahir Dar Institute of Technology-Bahir Dar University, Bahir Dar, P.O. Box 26, Ethiopia.
⁴ Department of Industrial Chemistry, College of Science, Bahir Dar University, P.O. Box 79, Bahir Dar, Ethiopia.

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.