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Electrochemical characteristics of Co3O4 nanoparticles synthesized via the hydrothermal approach for supercapacitor applications

Cobalt oxide (Co 3 O 4 ), a transition metal oxide known for its favourable capacitive properties and surface characteristics, is a promising candidate for electrode materials in supercapacitive energy storage applications. This study presents a comprehensive analysis of cobalt oxide nanoparticles s...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2024-07, Vol.28 (7), p.2203-2210
Main Authors: Babu, Chrisma Rose, Avani, A. V., Shaji, S., Anila, E. I.
Format: Article
Language:English
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Summary:Cobalt oxide (Co 3 O 4 ), a transition metal oxide known for its favourable capacitive properties and surface characteristics, is a promising candidate for electrode materials in supercapacitive energy storage applications. This study presents a comprehensive analysis of cobalt oxide nanoparticles synthesized through the hydrothermal method at varying synthesis temperatures, focusing on their structural, optical, electrochemical, and surface properties. X-ray diffraction analysis confirmed the cubic spinel structure of Co 3 O 4 , while Raman spectroscopy verified the phase composition of the nanoparticles. X-ray photoelectron spectroscopy offered insights into the near-surface chemistry of the synthesized material. The study determined two direct bandgaps of Co 3 O 4 through absorption spectra and Tauc plots. To assess surface morphology and particle size distribution, field-emitting scanning electron microscopy and transmission electron microscopy were employed. Electrochemical investigations involved cyclic voltammetry and Nyquist plots, while galvanostatic charge–discharge tests demonstrated a specific capacitance ( C sp ) of 450 Fg −1 at 1 Ag −1 . Impedance analysis indicated favourable capacitive behaviour with low charge transfer resistance. Furthermore, the study observed cyclic stability with a capacitive retention rate exceeding 88% at a current density of 20 Ag −1 over 10,000 cycles. The paper also discusses the capacitive and diffusion-controlled charge storage mechanisms at lower scan rates, emphasizing the potential of Co 3 O 4 nanoparticles as the electrode material in the development of supercapacitor devices.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-023-05744-y