Crystalline Phases Thermal Behaviour, Optical Energy Band Gap, and Broadband Radio Wave Frequency Dielectric Properties of PEO/PVDF Blend Films

Dhatarwal, Priyanka; Sengwa, R. J.

doi:10.1007/s13233-022-0052-6

Cited by 15 publications

(7 citation statements)

References 61 publications

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“…Thus, the graphical representation of ( h ν F km ) 2 against h ν can be used to evolve the band gap energy by extrapolating the linear portion to the X -axis ( h ν = 0), as manifested in Figure . It has been found that the band gap of Cu 1.8 Se 0.6 S 0.4 nanopowder is about 1.23 eV (Figure a), which agrees with many previous reports. − On the other hand, the band gap energy of Cu 1.8 Se 0.6 S 0.4 is about 3.07 eV (Figure b), which is attributed to the presence of PVDF, which has a large band gap (5.66 eV) − leading to widening of the band of the composite. Here, Cu 1.8 Se 0.6 S 0.4 has been mixed and filled inside the PVDF, and now, the band gap is the band gap of the whole composite (mixture) and not for Cu 1.8 Se 0.6 S 0.4 only.…”

Section: Resultssupporting

confidence: 89%

Nanosynthesis and Characterization of Cu_1.8Se_0.6S_0.4 as a Potential Cathode for Magnesium Battery Applications

Mohammad H. Al Sulami,

Alsabban,

Al-Sulami

et al. 2023

Langmuir

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Copper selenide (Cu–Se) and copper sulfide (Cu–S) are promising cathodes for magnesium-ion batteries. However, the low electronic conductivity of Cu–Se system results in a poor rate capability and unsatisfactory cycling performance. Mg-ion batteries based on the Cu–S cathode exhibited large kinetic barriers during the recharging process owing to the presence of polysulfide species. This work attempts to circumvent this dilemma by doping Cu1.8Se by sulfur, which replaces the selenium in the CuSe lattice to form Cu1.8Se0.6S0.4 nanocrystalline powder. The presence of sulfur will increase the electronic conductivity, and the presence of selenium will mitigate the effect of polysulfide species that hinder the kinetics of Mg2+. Herein, a Cu1.8Se0.6S0.4 nanocrystalline powder was synthesized by the solid-state reaction, yielding a highly pure and stoichiometric powder. The crystallographic structure of the nanopowder and the conversion-type storage mechanism have been attested via ex situ X-ray diffraction and energy-dispersive X-ray analysis. The nanocrystalline feature of Cu1.8Se0.6S0.4 was demonstrated by high-resolution transmission electron microscopy. An apparent surface morphology change during the charging/discharging process has been visualized by a field emission scanning electron microscope. Diffuse reflectance spectroscopy has discussed the variation of the band gap during charging and discharging. The full Mg/Cu1.8Se0.6S0.4 cells presented an initial discharge capacity of 387.99 mAh g– 1 at a current density of 0.02 mA cm–2; moreover, they show moderate diffusion kinetics with ≈ 10–15 cm–2 s–1.

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Section: Resultssupporting

confidence: 89%

Nanosynthesis and Characterization of Cu_1.8Se_0.6S_0.4 as a Potential Cathode for Magnesium Battery Applications

Mohammad H. Al Sulami,

Alsabban,

Al-Sulami

et al. 2023

Langmuir

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“…It can be seen from this figure that the visual optical transparency of both sets of SPE films decreases relatively with an increase in PEO amount in the PEO/PVP blend host matrix which is expected because the PVP is optically excellent transparent material 39 whereas PEO material film is of relatively poor transparency. 40 PiS film (Fig. 1c) appears with relatively better transparency compared to other samples which is due to high salt concentration.…”

Section: Resultsmentioning

confidence: 90%

“…17,19,42,43 In this relationship, the ΔH m0 is the melting enthalpy value of 100% crystalline PEO which is taken 213.7 J g −1 according to the literature. 17,19,40 The obtained X c values for these SPEs are listed in Table II and also plotted against x (wt%) of PEO in Fig. 4b.…”

Section: Resultsmentioning

confidence: 99%

Unveiling the Synergy of Polymer–Salt Compositions for Properties Enhancement of Solid Polymer Electrolytes Based on PEO/PVP Blend Polymer Matrix and LiTFSI Dopant Salt

Patel,

Sengwa,

Saraswat

2023

ECS Adv.

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Solid polymer electrolytes (SPEs) are ion-dipole complexes credited for their use in the design and development of widespread solid-state ion-conducting innovative devices. Herein, two sets of highly flexible, stretchable, and sticky-type ternary SPE films based on poly(ethylene oxide) (PEO)/ poly(vinyl pyrrolidone) (PVP) blend as host matrix of different compositional ratios (i.e., 25/75, 50/50, and 75/25 wt/wt%) with 30 and 50 wt% lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as ionic dopant salt, and also one sample of polymer-in-salt (PiS) comprised the 50/50 wt/wt% polymer blend matrix and 60 wt% salt, are prepared and characterized in detail. These SPEs are predominantly amorphous, having substantial absorbance for ultraviolet-visible radiations and tunable wide range energy band gaps. The 20 Hz to 1 GHz broadband dielectric permittivity, loss angle tangent, and electrical conductivity spectra explained a variety of polarization and structural relaxation processes and the mechanism of ion transport ruled by the compositional synergy of polymer and salt in these SPEs. The highest ionic conductivity with appreciable electrochemical performance of the SPE is found for the PEO-rich blend matrix with 50 wt% of LiTFSI dopant. We conclude the suitability of these SPEs for development of futuristic ion-conducting energy storage as well as revolutionary iontronic devices

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“…It is conspicuous that the absorbance value exhibits increment as the filler concentration was increased, which is strong evidence of the influence of filler on enhancing the absorbance. The very low absorbance of the pristine membrane is a powerful indication of the high transmittance of the PVDF/PEO membrane asserting the high purity of the membrane 56 …”

Section: Resultsmentioning

confidence: 99%

“…The very low absorbance of the pristine membrane is a powerful indication of the high transmittance of the PVDF/PEO membrane asserting the high purity of the membrane. 56 The quantified information of optical transition inside the investigated membranes can be evaluated by the absorption coefficient (α) and Tauc's formula by the following equations 57 :…”

Section: Composition and Morphologymentioning

confidence: 99%

Fabrication and characterization of (PVDF/PEO)/AgBiSe₂ polymeric membrane with enhanced visible light photocatalytic performance

Ismail,

Nasr,

Hameed

2023

J of Applied Polymer Sci

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Driven by the visible band gap, silver bismuth selenide (AgBiSe2) was loaded in PVDF/PEO blend to enhance the photodegradation of Maxilon blue dye. AgBiSe2 nanoparticles were successfully synthesized by facile solvothermal approach and then loaded to PVDF/PEO (80/20) by 10, 20, and 30 wt%, by evaporative casting method. The X‐ray results in tandem with the Fourier transform infrared (FTIR) established the successful fabrication of (PVDF/PEO)/x(AgBiSe2) polymer nanocomposites. The X‐ray analysis verified the formation of hexagonal AgBiSe2 of a crystallite size ranging from 14.3 to 23.24 nm. The FT‐IR results manifested an overlap between functional groups that corroborated the interaction between PVDF and PEO. Peaks of the AgSe, and SeO modes confirmed that the nanofiller and PVDF/PEO blend were successfully incorporated. The micrograph images by field emission scanning electron microscope (FESEM) unraveled the high tendency of AgBiSe2 to form a uniform cluster. The optical band gap was found to be a direct band gap of 2.86 eV for 30 wt% AgBiSe2 proving its validity as visible‐light‐driven photocatalysts. The removal percentages of the prepared membrane are 4.1, 59, 82, and 98 for 0, 10%, 20%, and 30% AgBiSe2 after 300 min of irradiation under simulated sunlight at pH 6.

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Crystalline Phases Thermal Behaviour, Optical Energy Band Gap, and Broadband Radio Wave Frequency Dielectric Properties of PEO/PVDF Blend Films

Cited by 15 publications

References 61 publications

Nanosynthesis and Characterization of Cu_1.8Se_0.6S_0.4 as a Potential Cathode for Magnesium Battery Applications

Nanosynthesis and Characterization of Cu_1.8Se_0.6S_0.4 as a Potential Cathode for Magnesium Battery Applications

Unveiling the Synergy of Polymer–Salt Compositions for Properties Enhancement of Solid Polymer Electrolytes Based on PEO/PVP Blend Polymer Matrix and LiTFSI Dopant Salt

Fabrication and characterization of (PVDF/PEO)/AgBiSe₂ polymeric membrane with enhanced visible light photocatalytic performance

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Crystalline Phases Thermal Behaviour, Optical Energy Band Gap, and Broadband Radio Wave Frequency Dielectric Properties of PEO/PVDF Blend Films

Cited by 15 publications

References 61 publications

Nanosynthesis and Characterization of Cu1.8Se0.6S0.4 as a Potential Cathode for Magnesium Battery Applications

Nanosynthesis and Characterization of Cu1.8Se0.6S0.4 as a Potential Cathode for Magnesium Battery Applications

Unveiling the Synergy of Polymer–Salt Compositions for Properties Enhancement of Solid Polymer Electrolytes Based on PEO/PVP Blend Polymer Matrix and LiTFSI Dopant Salt

Fabrication and characterization of (PVDF/PEO)/AgBiSe2 polymeric membrane with enhanced visible light photocatalytic performance

Contact Info

Product

Resources

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Nanosynthesis and Characterization of Cu_1.8Se_0.6S_0.4 as a Potential Cathode for Magnesium Battery Applications

Nanosynthesis and Characterization of Cu_1.8Se_0.6S_0.4 as a Potential Cathode for Magnesium Battery Applications

Fabrication and characterization of (PVDF/PEO)/AgBiSe₂ polymeric membrane with enhanced visible light photocatalytic performance