Studies on Synthesis and Various Characteristics of Green Materials for Energy Conversion Applications

Jha, Ranjana; Bhushan, Medha; Bhardwaj, Rekha

doi:10.1007/978-3-030-50108-2_1

Cited by 5 publications

(2 citation statements)

References 68 publications

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“…The advancement in solar cell technology with green synthesis is a promising and tenable approach to solve energy catastrophe and environmental problems. Green synthesis being environmentally friendly and eliminate toxic waste and use ecological solvent is one of the best sample preparation method [1], [2]. Whereas quantum dots material shows unique properties from their larger counter parts, such as change in band gap and particle size.…”

Section: Introductionmentioning

confidence: 99%

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

Phogat,

Shreya,

Jha

et al. 2023

MSF

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ZnS quantum dots were synthesized using green synthesis route which are cost effective and eco-friendly. X-ray diffraction study revealed the formation of single phase ZnS. Crystallite size and strain in the as synthesized material were calculated through Williamson-Hall and Size-Strain plot. UV-Vis spectroscopy investigations revealed the absorption region and optical band gap for the ZnS with refractive index analysis. Microstructural analysis of material was done using high resolution transmission electron microscope (HRTEM) which confirms the presence of quantum dots. Selected area electron diffraction pattern (SAEDP) of the corresponding area revealed the polycrystalline nature of as synthesized ZnS with fine crystallites oriented along (111) and (022) planes. Results of analysis of lattice fringe spacing’s of fine crystallites are found to be in good agreement with SAEDP data. Elemental compositional analysis was carried by using EDS as an attachment of TEM which showed the presence of Zinc and Sulphur only. Nyquist plot reported Warburg impedance which suggests the material for solar cell applications.

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Section: Introductionmentioning

confidence: 99%

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

Phogat,

Shreya,

Jha

et al. 2023

MSF

Self Cite

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“…By embracing solar energy, societies can take significant strides towards achieving energy security, reducing dependency on finite fossil fuels, and mitigating the adverse impacts of climate change. Emphasizing the importance of solar energy adoption is crucial for a cleaner, greener, and more sustainable future for our planet [1]. Intense research is being done to increase the effectiveness of solar cells [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical analysis of thermally treated two dimensional zinc sulphide hexagonal nano-sheets with reduced band gap

Phogat,

Shreya,

Jha

et al. 2023

Phys. Scr.

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Significantly reduced band gap (2.0 eV) ZnS nanoparticles are synthesized using microwave/ultraviolet/ultrasonic assisted hydrothermal route in a two step process. Initially, ZnS nanospheres are synthesized, showing a cubic structural phase with a band gap of 3.2 eV, which is further annealed at 1000°C to get the final product. Following annealing, the cubic ZnS undergoes a phase change to wurtzite ZnS, in the form of hexagonal nanosheets showing polymorphism phenomena, along with a reduced band gap of 2 eV. The optical analysis reveals a red shift in the absorbance region, transitioning from the absorption of UV radiations in cubic ZnS to visible radiations in wurtzite ZnS. TGA measurements and analysis also revealed the phase change of ZnS (cubic) to ZnS (Wurtzite) when heated at 1000 oC. Microstructural analysis reveals the formation of sheets oriented along (100) plane, which is evidenced by the interplanar spacing and lattice fringes. The photoluminscence spectra highlights quantum energy states present between the HOMO, which is 2.36 eV for cubic phase and 1.76 eV for the hexagonal phase, and the LUMO, with values of -0.84 eV for cubic while -0.24 for hexagonal ZnS. The CIE coordinates for wurtzite ZnS, at X= 0.55 and Y= 0.23, corresponds to red light emission. The suitability of wurtzite phase ZnS for solar cell applications has been demonstrated through electrochemical studies using Nyquist plot and cyclic voltrammetry (CV) techniques. CV demonstrates the presence of redox peaks and reversibility of the material during the redox process. The diffusive behaviour also confirmed by observing the variation of peak current with scan rate, following Rendle Sevick equation. The presence of Warburg diffusion in Nyquist plot indicates the efficient charge transfer dynamics of the material, suggesting high potential for exciton formation in energy production. Consequently, this material stands as promising candidate for efficient solar cells.

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Photocatalytic Performance of ZnO@ZnS Core–Shell Heterostructures for Malachite Green and Rhodamine B Dye Degradation

Phogat,

Shreya,

Jha

et al. 2024

Physica Status Solidi (a)

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The one‐step green synthesis of wide band gap zinc oxide@zinc sulfide (ZnO@ZnS) core–shell nanostructures offers promising prospects in wastewater treatment. These nanostructures exhibit a porous nature crucial for effective dye adsorption, as evidenced by Brunauer‐Emmett‐Teller (BET) and microscopic characterization. The synthesized material demonstrates high stability and minimal agglomeration, verified through BET analysis and zeta potential measurements. X‐ray powder diffraction confirms the presence of ZnO and ZnS phases. Transmission electron microscopy reveals the development of porous nanorods on the core surface, maximizing the surface area for dye adsorption. In wastewater treatment, the nanostructures exhibit notable performance, degrading 90% of malachite green and 50% of rhodamine B dyes within 120 min under normal conditions. Detailed discussions delve into the degradation mechanism, elucidating the major species responsible for the process. This study underscores the potential of ZnO@ZnS nanostructures in efficient organic pollutant removal, marking a significant advancement in environmental remediation.

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Studies on Synthesis and Various Characteristics of Green Materials for Energy Conversion Applications

Cited by 5 publications

References 68 publications

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

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

Electrochemical analysis of thermally treated two dimensional zinc sulphide hexagonal nano-sheets with reduced band gap

Photocatalytic Performance of ZnO@ZnS Core–Shell Heterostructures for Malachite Green and Rhodamine B Dye Degradation

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