In this study, spinel-type cobalt oxide (Co3O4) and Co3-xDyxO4 (x = 0.04 and 0.05 molar ratio) nanoparticles were synthesized via combustion method at 700 °C. Crystallite nature, phase purity and thermal analysis of the prepared compounds were investigated by PXRD, FT-IR and TGA techniques. Structural analyses were performed by the FullProf program employing profile matching with constant scale...

Co3O4 nanoparticles were synthesized via a simple Co-precipitation reaction between precursors of cobalt and NH3. The effect of different parameters such as concentration of NH3 and precursors of cobalt on the size and photocatalytic activity of the products was investigated. The achieved nanoparticles were characterized by X-ray powder diffraction analysis, field emission scanning electron mic...

Substitution of ionic platinum is carried out in Co3O4 host synthesized by solution combustion strategy. These Pt substituted spinels characterized XRD show pure crystalline phase without any separated peaks related to Pt/PtOx. Electrochemical OER activities these are investigated cyclic voltammetry, linear sweep voltammetry and chronoamperometry neutral, alkaline neutral buffer electrolytes. L...

Cobalt oxide has good catalytic activity for peroxydisulfate (PDS) activation but poor stability and is vulnerable to inactivation because of agglomeration. In this work, the chlortetracycline (CTC) degradation by catalysis using reduced graphene support cobalt (Co3O4/rGO) composite catalyst was investigated. It found that 86.3% CTC degraded within 120 min in Co3O4/rGO-800/PDS system. The influ...

Cobalt oxide/graphene oxide (Co3O4/GO) nanocomposites were synthesised using the co-precipitation synthesis process. The polycrystalline nature of Co3O4 nanoparticles onto GO sheets is studied by X-ray diffraction (XRD) pattern where found in with a particle size 35 nm. structural and morphological field emission scanning electron microscopy (FESEM) EDX, distribution on nanosheets was observed....

nanosized metal oxides dispersed polymer composites constitute a fascinating class of polymer composite materials. synthesis of such composite materials through solvent casting enhances the polymer synthetic technology. solvent casting method was used to prepare cobalt oxide (co3o4) dispersed poly (methyl methacrylate) (pmma) nano composite. x-ray diffraction tool is used to know the structural...

In this study, we utilized nano-sized Co3O4 and reduced graphene oxides (rGOs) as composite anode materials for Li-ion batteries. The Co3O4/C was derived from ZIF67 (Zeolitic Imidazolate Framework-67) wrapped in rGOs through precipitation. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM) were used to identify the crystal structure, phase purity, surface morphology...

We present herein the first in situ site-selective XAS experiment performed on a proof-of-principle transformation of a mixed-valence compound: the calcination of the K0.1Co(II)4[Co(III)(CN)6]2.7·20H2O Prussian Blue analogue (containing Co(2+) and Co(3+) ions in two different Oh sites) into Co3O4 (containing Co(2+) ions in a Td site and Co(3+) in an Oh site). By recording the Co K-edge X-ray ab...

We revealed an interesting facet-dependent electrochemical behavior toward heavy metal ions (HMIs) based on their adsorption behaviors. The (111) facet of Co3O4 nanoplates has better electrochemical sensing performance than that of the (001) facet of Co3O4 nanocubes. Adsorption measurements and density-functional theory (DFT) calculations reveals that adsorption of HMIs is responsible for the d...

Although using supported noble-metal catalysts for CO2 hydrogenation is an effective solution due to their excellent catalytic properties, metal oxide supports themselves can exhibit good activity being more economically feasible. This work focuses on investigating the complexity of Co3O4 system during methanation reaction, which usually accompanied by formation unstable dispersions cobalt and ...