Fast Synthesis of Co<sub>3</sub>O<sub>4</sub> by Microwave-Assisted Hydrothermal Treatment

Medina, Midilane S.; Zenatti, Alessandra; Escote, M. T.

doi:10.1155/2020/2535019

Cited by 3 publications

(1 citation statement)

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“…Medina et al group synthesized Co 3 O 4 nanocubes and nanoplates by microwave assisted hydrothermal method at a temperature of 180 °C-220 °C using urea and hydrogen peroxide as oxidizing agents. 48 They observed that the reaction time and oxidizing agent played a crucial role in controlling the particle size and shape. S. Mallesh et al reported the synthesis of α-Fe 2 O 3 nanostructures with cube like shape using surfactant free microwave assisted solvothermal method.…”

Section: Microwave Assisted Synthesis Of Nanomaterialsmentioning

confidence: 99%

Review—Development of Inorganic Nanostructures by Microwave Synthesis Technique

Rao

Satyanarayana

2021

ECS J. Solid State Sci. Technol.

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We present an overview of microwave-assisted synthesis method to develop inorganic nanostructured materials, which have received great interest due to their potential applications in different fields of science and technology. The current trend for the adoption of eco-friendly synthesis methods for the preparation of nanomaterials has thrown a challenge to develop synthetic methods that offer significant reduction in reaction time, lower energy consumption and less use of toxic chemicals. The microwave (MW) assisted synthesis route can play the role of a potential green synthesis approach to prepare inorganic nanostructured materials and their composites. In addition, the MW assisted route provides uniform heating throughout the reaction mixture and minimizes the non-uniform temperature profile, which results in the formation of uniform small nanoparticles. This review discusses the basic principles of MW synthesis to understand the MW heating mechanism. In addition, we discuss recent progress on the development of inorganic nanostructures in liquid phase by MW synthesis technique. Finally, we present the application of microwave synthesized nanomaterials in the development of battery technology, followed by safety features and future aspects of MW synthesis.

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Section: Microwave Assisted Synthesis Of Nanomaterialsmentioning

confidence: 99%

Review—Development of Inorganic Nanostructures by Microwave Synthesis Technique

Rao

Satyanarayana

2021

ECS J. Solid State Sci. Technol.

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Facile hydrothermally grown cobalt oxide (Co₃O₄) nanostructures and their electrochemical performances

Athira,

Dhanapandian,

Suthakaran

et al. 2024

Zeitschrift Für Physikalische Chemie

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In this study, pure cobalt oxide (Co3O4) nanoparticles were synthesized using a simple hydrothermal approach. The effect of the reducing agent and reaction temperatures of the prepared products were examined. Co3O4 is formed in the as-synthesized sample, at reaction temperature 190 °C was observed in the XRD pattern. The XPS survey scan spectrum showed the distinctive peaks of the Co and O elements and their valence states. FESEM and HRTEM revealed the particles as cubical in nature. Peak associated with the elements Co and O on the EDAX spectrum demonstrated the purity of the nanoparticles. Three electrode setups were used to measure the electrochemical properties of the synthesized nanoparticles. DTA curve corresponding exothermic peak at 225 °C and the crystallization of the final product was attributed for the third weight loss of 1.5 % in the temperature range of 280 °C to 450 °C. Formation of Co3O4 was confirmed by the observed XRD diffraction peaks at 2θ = 36.83°, 59.82°, and 65.30°, which correspond to h k l planes (311), (511) and (440), respectively. The high-resolution Co2p spectra showed two prominent spin-orbital peaks, 2p1/2 and 2p3/2, at 796.37 eV and 781.81 eV, respectively. The increase in temperature causes the particle size to grow ranges between 20 and 70 nm and the average particle size distribution in the TEM image is 42 nm. The integral area of the CV curve was measured during the CV measurement and as the as-prepared Co3O4 electrode displays specific capacitance values of 154, 126, 81, 65, and 49 Fg−1 at various scan rates of 10, 20, 50, 70, and 100 mVs−1, respectively.

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