Green synthesis of cobalt oxide thin films as an electrode material for electrochemical capacitor application

Gaikar, Paresh S.; Angre, Ankita P.; Wadhawa, Gurumeet C.; Ledade, Pankaj V.; Mahmood, Sami H.; Lambat, Trimurti L.

doi:10.1016/j.crgsc.2022.100265

Cited by 12 publications

(6 citation statements)

References 46 publications

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“…10 mL of the P. guajava leaf extract was added to 6 g of cobalt nitrate solution to synthesize cobalt oxide (Co 3 O 4 ) nanoparticles [ 67 ]. This reaction solution was kept on the hot plate for 3 h to synthesize cobalt nanoparticles.…”

Section: Methodsmentioning

confidence: 99%

Green Synthesis and Characterization of Cobalt Oxide Nanoparticles Using Psidium guajava Leaves Extracts and Their Photocatalytic and Biological Activities

et al. 2022

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The advanced technology for synthesizing nanoparticles utilizes natural resources in an environmentally friendly manner. Additionally, green synthesis is preferred to chemical and physical synthesis because it takes less time and effort. The green synthesis of cobalt oxide nanoparticles has recently risen due to its physico-chemical properties. In this study, many functional groups present in Psidium guajava leaf extracts are used to stabilize the synthesis of cobalt oxide nanoparticles. The biosynthesized cobalt oxide nanoparticles were investigated using UV-visible spectroscopic analysis. Additionally, Fourier-transform infrared spectroscopy revealed the presence of carboxylic acids, hydroxyl groups, aromatic amines, alcohols and phenolic groups. The X-ray diffraction analysis showed various peaks ranging from 32.35 to 67.35°, and the highest intensity showed at 36.69°. The particle size ranged from 26 to 40 nm and confirmed the average particle size is 30.9 nm. The green synthesized P. guajava cobalt oxide nanoparticles contain cobalt as the major abundant element, with 42.26 wt% and 18.75 at% confirmed by the EDAX techniques. SEM images of green synthesized P. guajava cobalt oxide nanoparticles showed agglomerated and non-uniform spherical particles. The anti-bacterial activity of green synthesized P. guajava cobalt oxide nanoparticles was evaluated against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli with a 7 to 18 mm inhibitory zone. The photocatalytic activity was evaluated using green synthesized P. guajava cobalt oxide nanoparticles and observed 79% of dye degradation. The MTT assay of P. guajava cobalt oxide nanoparticles showed an excellent cytotoxic effect against MCF 7 and HCT 116 cells compared to normal cells. The percentage of cell viability of P. guajava cobalt oxide nanoparticles was observed as 90, 83, 77, 68, 61, 58 and 52% for MCF-7 cells and 82, 70, 63, 51, 43, 40, and 37% for HCT 116 cells at the concentration of 1.53, 3.06, 6.12, 12.24, 24.48, 50, and 100 μg/mL compared to control cells. These results confirmed that green synthesized P. guajava cobalt oxide nanoparticles have a potential photocatalytic and anti-bacterial activity and also reduced cell viability against MCF-7 breast cancer and HCT 116 colorectal cancer cells.

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Section: Methodsmentioning

confidence: 99%

Green Synthesis and Characterization of Cobalt Oxide Nanoparticles Using Psidium guajava Leaves Extracts and Their Photocatalytic and Biological Activities

et al. 2022

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“…Thin oxide films with a developed surface are promising for applications in electrochemical capacitors [23]. The formation of nanocells with four or five walls during the anodizing of silicon in IL with a water content of up to 2% was observed recently [24].…”

Section: Anodic Modification Of the Alloy Surface In Bmimntfmentioning

confidence: 99%

Is a 2D Nanostructured Surface Capable of Changing the Corrosion and Magnetic Properties of an Amorphous Alloy?

Kuznetsova,

Lebedeva,

Kultin

et al. 2023

IJMS

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In this work, an attempt was made to reveal and explain the influence of the process of formation of 2D nanostructures at the surface of an amorphous alloy (an alloy with the composition Co75Si15Fe5Cr4.5Al0.5 (in at.%) was used for this purpose) on the corrosion and magnetic properties of such an alloy. Two-dimensional nanostructures (nanocells of 100–150 nm in size, which were obtained by anodizing the initial sample in an ionic liquid) are essentially a pattern on the surface of the sample, and they cannot completely cover and block the surface from external effects. It was postulated that the presence of these nanostructures during corrosion and magnetic tests has no significant effect. However, a noticeable inhibition effect was observed during corrosion tests and a less noticeable (but still detectable) effect was observed during magnetic tests. The authors believe that the effect obtained, with a detailed study, can be used to increase the corrosion resistance and to improve the properties of traditional magnetic materials.

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“…[16][17][18][19] Among these nanomaterials, cobalt oxide has gained interest as an superior electrochemical material for electrodes and offers excellent catalytic properties. 20 Various morphologies of the cobalt oxide have been synthesised using chemical vapour deposition, sol-gel techniques, chemical precursor routes, and electrophoretic deposition techniques. 21 The synthesised nanostructures of cobalt oxide are frequently used for electrochemical sensing, energy storage, and energy conversion applications due to their fast electron communication and good catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Hexagonal cobalt oxide nanosheet-based enzymeless electrochemical uric acid sensor with improved sensitivity

et al. 2023

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Green synthesis of cobalt oxide thin films as an electrode material for electrochemical capacitor application

Cited by 12 publications

References 46 publications

Green Synthesis and Characterization of Cobalt Oxide Nanoparticles Using Psidium guajava Leaves Extracts and Their Photocatalytic and Biological Activities

Green Synthesis and Characterization of Cobalt Oxide Nanoparticles Using Psidium guajava Leaves Extracts and Their Photocatalytic and Biological Activities

Is a 2D Nanostructured Surface Capable of Changing the Corrosion and Magnetic Properties of an Amorphous Alloy?

Hexagonal cobalt oxide nanosheet-based enzymeless electrochemical uric acid sensor with improved sensitivity

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