Improved performance of dye-sensitized solar cells based on modified kaolin/PVDF-HFP composite gel electrolytes

The polymer electrolyte films (poly((vinylidene fluoride)- co -hexafluoropropylene)/LiClO 4 @90:10 w/w, PHL10) were prepared by solution-casting technique and the effect of various dosages of electron beam (EB) irradiation on structure, morphology, thermal, dielectric, and conductivity properties at various dosages. The atomic force microscope topography image shows substantial change in surface morphology due to irradiation and the modification of chemical bonds through chain scission process with increased EB dose was confirmed by Fourier transform infrared spectroscopy studies. NMR studies confirm the change in structural properties due to irradiation. The X-ray diffractometer confirms the decreased crystallinity from 50.10 for unirradiated film to 40.96 at 120 kGy doses; hence, increase in amorphousity due to a decrease in melting temperature from 460 to 418 °C leads to the degradation of the polymer, and the differential scanning calorimetry study reveals the decreased crystallinity with increased irradiation dose. The dielectric and modulus parameters are observed to decrease with increasing frequency as well as temperature. The conductivity increases with frequency and EB dose due to the increased segmental motion of charged ions by chain scission/cross-linking process. The high conductivity of 1.81 × 10 –3 S/cm with the corresponding relaxation time of 1.697 × 10 –6 at 120 kGy dose was observed. The conduction mechanism reveals an Ohmic behavior and the I – V plot exhibits a gradual increase in current with applied voltage as well as irradiation dose. The electrochemical performance of the irradiated polymer electrolyte was improved significantly and hence the polymer electrolytes can be used in solid-state batteries and storage applications after altering the properties by the influence of irradiation.

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“…The result confirms the increased amorphisity in the irradiated polymer film. 31,32 This observation is in correlation with the XRD results.…”

Section: Resultssupporting

confidence: 87%

Modified Thermal, Dielectric, and Electrical Conductivity of PVDF-HFP/LiClO₄Polymer Electrolyte Films by 8 MeV Electron Beam Irradiation

et al. 2018

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“…The peaks at 3448.64 and 1644.33 cm −1 (gray shadow marked) should be ascribed to OH stretching and bending vibrational absorption in the interlayer of KL. [ 38 ] With Zn embedded, the two peaks were significantly broadened along with increased intensity, suggesting that Zn 2+ may remain in the interlayer of kaolin with hydroxyl (Figure S8, Supporting Information). Compared with KL(Zn), the Mn‐embedded kaolin exhibited a similar but much smaller variation of those peaks, which confirmed that the Mn is only physically absorbed on the surface.…”

Section: Resultsmentioning

confidence: 99%

A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode

Deng

Xie

Han

et al. 2020

Adv Funct Materials

508

363

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Zinc metal is considered as one of the best anode choices for rechargeable aqueous Zn-based batteries due to its high specific capacity, abundance, and safety. However, dendrite and corrosion issues remain a challenge for this system. Herein, sieve-element function (selective channel of Zn 2+ ) and uniform-pore distribution (≈3.0 nm) of a kaolin-coated Zn anode (KL-Zn) is proposed to alleviate these problems. Based on the artificial Zn metal/electrolyte interface, the KL-Zn anode not only ensures dendritefree deposition and long-time stability (800 h at 1.1 mA h cm −2 ), but also retards side reactions. As a consequence, KL-Zn/MnO 2 batteries can deliver high specific capacity and good capacity retention as well as a reasonably well-preserved morphology (KL-Zn) after 600 cycles at 0.5 A g −1 . This work provides a deep step toward high-performance rechargeable Zn-based battery system.

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“…The chemical functionalization decreases the NP aggregation, retaining a relatively large active surface area on the nanoparticles. This would, in turn, align the local density of

to further accelerate the diffusion of the redox couple across the interconnected network structure of the GPEs [ 62 , 65 ]. Enhancement in kinetics of the dye regeneration by increasing the mobilization of the charge carriers added to the values of J SC , FF , and η .…”

Section: Resultsmentioning

confidence: 99%

Microstructural Development and Rheological Study of a Nanocomposite Gel Polymer Electrolyte Based on Functionalized Graphene for Dye-Sensitized Solar Cells

et al. 2020

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For a liquid electrolyte-based dye-sensitized solar cell (DSSC), long-term device instability is known to negatively affect the ionic conductivity and cell performance. These issues can be resolved by using the so called quasi-solid-state electrolytes. Despite the enhanced ionic conductivity of graphene nanoplatelets (GNPs), their inherent tendency toward aggregation has limited their application in quasi-solid-state electrolytes. In the present study, the GNPs were chemically modified by polyethylene glycol (PEG) through amidation reaction to obtain a dispersible nanostructure in a poly(vinylidene fluoride-co-hexafluoro propylene) copolymer and polyethylene oxide (PVDF–HFP/PEO) polymer-blended gel electrolyte. Maximum ionic conductivity (4.11 × 10−3 S cm−1) was obtained with the optimal nanocomposite gel polymer electrolyte (GPE) containing 0.75 wt% functionalized graphene nanoplatelets (FGNPs), corresponding to a power conversion efficiency of 5.45%, which was 1.42% and 0.67% higher than those of the nanoparticle-free and optimized-GPE (containing 1 wt% GNP) DSSCs, respectively. Incorporating an optimum dosage of FGNP, a homogenous particle network was fabricated that could effectively mobilize the redox-active species in the amorphous region of the matrix. Surface morphology assessments were further performed through scanning electron microscopy (SEM). The results of rheological measurements revealed the plasticizing effect of the ionic liquid (IL), offering a proper insight into the polymer–particle interactions within the polymeric nanocomposite. Based on differential scanning calorimetry (DSC) investigations, the decrease in the glass transition temperature (and the resultant increase in flexibility) highlighted the influence of IL and polymer–nanoparticle interactions. The obtained results shed light on the effectiveness of the FGNPs for the DSSCs.

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Improved performance of dye-sensitized solar cells based on modified kaolin/PVDF-HFP composite gel electrolytes

Abstract: The DSSCs based on modified kaolin/PVDF-HFP composite gel electrolyte have excellent efficiency.

Cited by 19 publications

References 53 publications

Modified Thermal, Dielectric, and Electrical Conductivity of PVDF-HFP/LiClO₄Polymer Electrolyte Films by 8 MeV Electron Beam Irradiation

Modified Thermal, Dielectric, and Electrical Conductivity of PVDF-HFP/LiClO₄Polymer Electrolyte Films by 8 MeV Electron Beam Irradiation

A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode

Microstructural Development and Rheological Study of a Nanocomposite Gel Polymer Electrolyte Based on Functionalized Graphene for Dye-Sensitized Solar Cells

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Improved performance of dye-sensitized solar cells based on modified kaolin/PVDF-HFP composite gel electrolytes

Abstract: The DSSCs based on modified kaolin/PVDF-HFP composite gel electrolyte have excellent efficiency.

Cited by 19 publications

References 53 publications

Modified Thermal, Dielectric, and Electrical Conductivity of PVDF-HFP/LiClO4Polymer Electrolyte Films by 8 MeV Electron Beam Irradiation

Modified Thermal, Dielectric, and Electrical Conductivity of PVDF-HFP/LiClO4Polymer Electrolyte Films by 8 MeV Electron Beam Irradiation

A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode

Microstructural Development and Rheological Study of a Nanocomposite Gel Polymer Electrolyte Based on Functionalized Graphene for Dye-Sensitized Solar Cells

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Product

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Modified Thermal, Dielectric, and Electrical Conductivity of PVDF-HFP/LiClO₄Polymer Electrolyte Films by 8 MeV Electron Beam Irradiation

Modified Thermal, Dielectric, and Electrical Conductivity of PVDF-HFP/LiClO₄Polymer Electrolyte Films by 8 MeV Electron Beam Irradiation