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• W4386880023 endingPage "111458" @default.
• W4386880023 startingPage "111458" @default.
• W4386880023 abstract "The supercapacitive properties of Co3O4 nanocrystalline powders with two different morphologies synthesized by coprecipitation (referred to as Co3O4-C) and hydrothermal (referred to as Co3O4-H) methods were compared and studied. The samples were analyzed for their phase purity, crystal structure, surface morphology, and surface area. Both samples were found to be single-phase nanostructures with a normal spinel-type cubic crystal structure (space group Fd3¯m), as indicated by Raman and XRD (X-ray diffraction) data analyses. TEM (Transmission electron microscopy) images clearly show that the Co3O4-C sample exhibits spherical particles with a mean size of 10 nm. On the other hand, the Co3O4-H sample shows a flower-like assembly of particles. The Co3O4-C sample has a higher specific surface area than the Co3O4-H sample due to its smaller particle size. XPS (X-ray photoelectron spectroscopy) data were collected to analyze the chemical states and cation distribution of the samples, revealing a 2:1 ratio of Co3+ and Co2+ in both samples. Both samples displayed pseudocapacitive behaviour in CV (cyclic voltammetry) and GCD (galvanostatic charge-discharge) analyses. Despite having a smaller surface area, the Co3O4-H electrode exhibited a higher CS (specific capacitance) compared to the Co3O4-C electrode at all current densities when tested using 1 M KOH electrolyte. At a specific current density (0.5 A/g), the Cs values for Co3O4-C and Co3O4-H are found to be 366 F/g and 233 F/g, respectively. As the current density increases, the specific capacitance of both electrodes decreases, but this reduction is more prominent for Co3O4-C than Co3O4-H. The study indicates that besides surface area, the morphology of the sample also plays a crucial role in determining the capacitance of a material." @default.
• W4386880023 created "2023-09-21" @default.
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• W4386880023 date "2023-12-01" @default.
• W4386880023 modified "2023-09-30" @default.
• W4386880023 title "Morphology-dependent supercapacitive properties of Co3O4 nanomaterials synthesized via coprecipitation and hydrothermal methods" @default.
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• W4386880023 doi "https://doi.org/10.1016/j.inoche.2023.111458" @default.
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