Impedance Study of Zinc Sulphide Quantum Dots via One Step Green Synthesis

Phogat, Peeyush; Shreya, Shreya; Jha, Ranjana; Singh, Sukhvir

doi:10.4028/p-g1ccxq

Cited by 20 publications

(6 citation statements)

References 17 publications

(10 reference statements)

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“…The diffusive and capacitive contributions of the thin films was investigated by employing Dunn’s model. ,, According to this concept, the relationship between the current and scan rate determines whether a material will behave in a capacitive or diffusive manner at a fixed potential. This model states that the current has a capacitive nature when it varies linearly with scan rate and the diffusive nature when it varies linearly with scanrate .…”

Section: Resultsmentioning

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: Resultsmentioning

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 smaller radii semicircles showed the presence of Warburg impedance also suggested by a slant line followed by the semicircle which shows the formation of infinite layer of ions at the interface [21]. It shows good diffusion of charge carriers in the system [22], [23].…”

Section: Electrochemical Studiesmentioning

confidence: 86%

Reduction mechanism of hydrothermally synthesized wide band gap ZnWO₄ nanorods for HER application

Shreya,

Phogat,

Singh

et al. 2024

MATEC Web Conf.

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This manuscript presents a detailed investigation of the synthesis of zinc tungstate (ZnWO4) nanoparticles and various characterizations of the as-synthesized sample to reveal its potential for hydrogen evolution reaction (HER). The study focuses on a simple and efficient hydrothermal method that facilitates the production of ZnWO4 nanoparticles, which involves the controlled reaction between zinc and tungstate ions in a specific solution. The resulting ZnWO4 nanoparticles were characterized by various characterization techniques which include XRD, UV-vis spectroscopy, TEM and electrochemical study to get insights into their size, structure, properties and electrochemical behaviour. The characterization includes the analysis of the nanoparticles' structural features and optical properties. The material’s electrochemical properties were also investigated by employing cyclic voltammetry (CV) and potentio electrochemical impedance spectroscopy (PEIS). The charge transfer process was studied for the material revealing its diffusion controlled behaviour and reduction peaks in the cathodic region. These properties suggest that the material is a potential candidate for HER catalysis.

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“…6.These particles may only appear at rather high QD concentrations. Figure 6(b) demonstrates the corresponding area of the material's selected area electron diffraction (SEAD) pattern and depicts the peak with hkl values of (111),(002), and (022) [16].…”

Section: Hr-temmentioning

confidence: 99%

Microwave Assisted Zinc Sulphide Quantum Dots for Energy Device Applications

Rai,

Phogat,

Shreya

et al. 2024

MATEC Web Conf.

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Zinc sulfide (ZnS) quantum dots (QDs) have received a lot of attention because of their potential usage in solar cell applications. The present work illustrates a straightforward green synthesis route for ZnS QDs, which is both cost-effective and environmentally friendly. The phase identification of the synthesized material was performed through the X-ray diffraction technique which revealed the presence of single-phase zinc sulfide. The crystallite size was calculated through various techniques such as Debye Scherrer’s, Williamson Hall and Size-Strain plot revealing quantum confinement effects. High-resolution transmission electron microscope (HR-TEM) revealed the presence of quantum dots within the quantum size range and demonstrated excellent quantum yield. However, the decrease in the particle size has increased the band gap for ZnS QDs to 3.4 eV with a refractive index of 2.29. The polycrystalline character of the as-synthesized ZnS was shown by the selected area electron diffraction (SAED) pattern of the corresponding TEM images. Morphological analysis, carried out via field emission scanning electron microscopy (FESEM), unveiled the existence of zinc sulfide quantum dots agglomerates. Elemental composition analysis was performed using energy dispersive spectroscopy (EDS) as an attachment to FESEM, which confirmed the existence only of zinc and sulphur.

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Impedance Study of Zinc Sulphide Quantum Dots via One Step Green Synthesis

Cited by 20 publications

References 17 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

Reduction mechanism of hydrothermally synthesized wide band gap ZnWO₄ nanorods for HER application

Microwave Assisted Zinc Sulphide Quantum Dots for Energy Device Applications

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Impedance Study of Zinc Sulphide Quantum Dots via One Step Green Synthesis

Cited by 20 publications

References 17 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

Reduction mechanism of hydrothermally synthesized wide band gap ZnWO4 nanorods for HER application

Microwave Assisted Zinc Sulphide Quantum Dots for Energy Device Applications

Contact Info

Product

Resources

About

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

Reduction mechanism of hydrothermally synthesized wide band gap ZnWO₄ nanorods for HER application