Characteristics of Transition Metal Oxides

Tyagi, Alekha; Banerjee, Soma; Cherusseri, Jayesh; Kar, Kamal K.

doi:10.1007/978-3-030-43009-2_3

Cited by 36 publications

(6 citation statements)

References 146 publications

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“…TMOs, a material class with remarkable features, are compelling for integration with MoS 2 to achieve notable properties . Their multiple oxidation states make them highly reactive, participating in redox reactions and showcasing considerable value in energy applications. − Outstanding optical properties, such as high refractive index, transparency, and significant absorption, can be found in a number of TMOs . Moreover, a few TMOs show excellent photocatalytic properties enabling the generation of electron–hole pairs. − An excellent TMO with a number of intriguing characteristics is tungsten oxide (WO 3 ).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS₂/WO₃ Nanocomposites for Futuristic Energy Applications

Shreya,

Phogat,

Jha

et al. 2024

ACS Appl. Nano Mater.

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The hybrid structures of transition-metal dichalcogenides and oxides show enhanced properties by incorporating the qualities of two pristine materials into a single one. In view of this, the present work focuses on synthesizing a series of MoS 2 /WO 3 nanocomposites wherein the molar ratio of MoS 2 to WO 3 was gradually varied to achieve the optimized properties for photovoltaic applications. The samples were analyzed for structural, optical, morphological, microstructural, electrokinetic, electrical, and electrochemical properties. Integrating the properties of MoS 2 and WO 3 provided enhanced properties in the form of wider absorbance range, optimized band gap, better colloidal stability, and increased charge-carrier mobility. The as-synthesized nanocomposites showed the absorbance in UV and visible regions with the band gap varying from 1.3 to 2.66 eV. The zeta potential measurement showed high colloidal stability of some of the nanocomposites with values < −30 mV. Hall effect study of MoS 2 /WO 3 nanocomposites revealed the enhancement in electrical properties, and the mobility is found to be of the order of 880 m 2 /(V s). The redox process was also more prominent for nanocomposite materials as well as enhanced diffusive behavior as analyzed by cyclic voltammetry. The presence of Warburg diffusion along with high-exchange current density was also observed in few samples as analyzed by potentio electrochemical impedance spectroscopy with the highest value of 336 μA. The present study reveals that the catalytic, optical, electrical, and electrochemical properties of MoS 2 /WO 3 nanocomposites can be optimized for solar cell applications by controlling the ratio of constituent materials.

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Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS₂/WO₃ Nanocomposites for Futuristic Energy Applications

Shreya,

Phogat,

Jha

et al. 2024

ACS Appl. Nano Mater.

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“…Many of the transition metal oxides are the potential candidates for optoelectronic applications due to their suitable optical and electronic properties [8][9][10][11][12][13][14][15][16][17][18][19][20]. One of them is tungsten oxide (WO 3 ), which has a bandgap of ∼2.6-3.0 eV [21].…”

Section: Introductionmentioning

confidence: 99%

Surfactant-mediated modulation of morphology and charge transfer dynamics in tungsten oxide nanoparticles

et al. 2023

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Tungsten Oxide (WO3) is a well-known transition metal oxide which exhibits non-toxicity and stability in its nanoparticle form. It is a potential candidate for a variety of applications due to its low cost and facile synthesis process. In the present work, WO3 nanoparticles were synthesized via facile acid-coprecipitation method to explore the effect of surfactants on the morphology of WO3 nanoparticles and thus, on its structural, optical and electrochemical properties. The morphology analysis revealed the formation of spherical nanoparticles in the absence of any surfactant while nanoflakes and nanosheets were observed in the presence of cetyltrimethylammonium bromide (CTAB) and polyethylene glycol (PEG), respectively. Moreover, the presence of surfactants was found to influence the crystallinity state of the samples. The different morphologies exhibited optical band gap of 2.2-2.7 eV as analyzed by UV-Vis spectroscopy along with other optical properties like absorbance range and refractive index. The electrochemical properties of the samples were studied by employing potentio electrochemical impedance spectroscopy (PEIS) and cyclic voltammetry (CV) techniques. CV analysis revealed the diffusion-controlled behavior of the samples which may be suitable for photovoltaic applications. Furthermore, impedance study showed the presence of Warburg impedance which indicates that there is an infinite layer of excitons on the surface of thin film, further suggesting WO3 as a prominent material for solar cell applications. The incorporation of surfactants resulted in the reduction of charge transfer resistance indicating more efficient charge transfer process.

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“…Cobalt oxide thin films are of interest to many researchers; Because it has desirable structural and optical properties, It has a different chemical formula (CoO, Co2O3, Co3O4), Co3O4 is the most stable of these oxides [3]. Cobalt oxide films are used in various applications, Cobalt oxide films are used in various applications, such as energy storage devices, gas sensors, solar cells, and some other applications on superconducting materials [4]. Nano-particles are synthesized in various ways within the framework of chemical, physical and biological processing [5].…”

Section: Introductionmentioning

confidence: 99%

Biosynthesis and characterization of (Co3O4) for solar cell applications via N-Sativa extract

Ahmed¹,

Ali²,

Abed³

2023

Global J. Eng. Technol. Adv.

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Cobalt oxide (Co3O4) NPs was created utilizing Nigella sativa extract and the green synthesis process, and it was then dropped onto a glass substrate. The crystal structural makeup of Nano-particles was ascertained using the X-ray diffraction (XRD) pattern. and described as a material function for applications such as solar cells and light detectors. The surface morphology revealed the surface of (Co3O4)-coated municipal embroidery by inspecting the XRD, According to XRD measured data, all of the films are Nano-crystallized in the cubic spinel configuration and have an uniform dispersion seven main peaks correspond to the (2θ,hkl) 18.9544o-(111), 31.1402o-(220), 36.6685o-(311), 44.6107o-(400), 59.4292o-(332), 65.2836o-(440), 77.31370-(333). These improvements have an effect on the optical characteristics. The optical band gap was calculated using the absorption coefficient The optical band gap energy Eg1=2.2 eV, Eg1=3.7 eV was encountered by us. In contrast, In order to identify the functional groups present in bismuth oxide molecules, FTIR analysis revealed the strength of infrared absorption as a function of wavelength, as seen in the Co-O band. On the other hand, the FTIR analysis. Using FE-SEM morphology, the incorporation of nano-crystaline in various sizes and forms was examined. The prepared films' AFM pictures are displayed [Avg. Dimensions are 75.62 nm, 1.39 roughness units, and 1.68 nm root mean square .The optical and structural properties of Co3O4 nanoparticle films were investigated in order to determine the optical energy gap and crystallite size. revealed the presence of the tetragonal phase... Finally, the (I-V) and find the parameter of solar cell (Ag / Co3O4 / Psi /Si / Ag) are filling factor is FF= 29.62 and transformation Efficiency η =3.2%.

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Characteristics of Transition Metal Oxides

Cited by 36 publications

References 146 publications

Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS₂/WO₃ Nanocomposites for Futuristic Energy Applications

Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS₂/WO₃ Nanocomposites for Futuristic Energy Applications

Surfactant-mediated modulation of morphology and charge transfer dynamics in tungsten oxide nanoparticles

Biosynthesis and characterization of (Co3O4) for solar cell applications via N-Sativa extract

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Characteristics of Transition Metal Oxides

Cited by 36 publications

References 146 publications

Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS2/WO3 Nanocomposites for Futuristic Energy Applications

Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS2/WO3 Nanocomposites for Futuristic Energy Applications

Surfactant-mediated modulation of morphology and charge transfer dynamics in tungsten oxide nanoparticles

Biosynthesis and characterization of (Co3O4) for solar cell applications via N-Sativa extract

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Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS₂/WO₃ Nanocomposites for Futuristic Energy Applications

Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS₂/WO₃ Nanocomposites for Futuristic Energy Applications