Free volume impact on ionic conductivity of PVdF/GO/PVP solid polymer electrolytes via positron annihilation approach

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dc.contributor.authorYılmazoğlu, Mesut
dc.contributor.authorOkkay, Hikmet
dc.contributor.authorAbacı, Ufuk
dc.contributor.authorTekay, Emre
dc.contributor.authorÇoban, Ozan
dc.contributor.authorVeziroğlu, Sümeyye
dc.contributor.authorYumak Yahşi, Ayşe
dc.contributor.authorTav, Cumali
dc.contributor.authorYahşi, Uğur
dc.date.accessioned2025-01-30T05:38:53Z
dc.date.available2025-01-30T05:38:53Z
dc.date.issued2025
dc.departmentFakülteler, Mühendislik Fakültesi, Metalurji ve Malzeme Mühendisliği Bölümü
dc.description.abstractThis study reports the effects of free volume (FV) profiles on the ionic conductivities of PVdF/GO/PVP ternary polymer electrolytes using positron annihilation lifetime spectroscopy (PALS). The electrolytes were characterized by various tests such as FTIR, XRD, TGA-DTG, SEM, contact angle and DMA. FV profiles were evaluated by o-Ps lifetime (τ₃), intensity (I3) and FV fractions (fυ). PVdF exhibits a proton conductivity of 2.1 × 10⁻5 S/m at 80 °C. However, the introduction of GO leads to a decrease in conductivity, with PVdF/GO showing 1.7 × 10⁻5 S/m at 80 °C. The presence of PVP in PVdF/GO/PVP10 and PVdF/GO/PVP30 creates new FV spaces via hydrogen bonds and intermolecular interactions, expanding hydrophobic areas and increasing I₃ values. PVP's high mobility and positive charge density reduce the τ₃ values. In contrast, I₃ and fυ values decrease in PVdF/GO/PVP50, accompanied by a significant drop in τ₃ values and the proton conductivity and dielectric constant peak at 6.1 × 10⁻2 S/m and 77.38, respectively. High PVP concentration may enhance interactions within the polymer matrix, forming a dense structure that, despite reduced FV, maintains or enhances proton mobility through alternative conduction pathways and increased polarization. This study emphasizes the balance of FV and dielectric behavior for efficient electrochemical processes.
dc.identifier.doi10.1016/j.radphyschem.2025.112539
dc.identifier.issn0969-806X
dc.identifier.issn1879-0895
dc.identifier.issue229
dc.identifier.scopus2-s2.0-85215225181
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.radphyschem.2025.112539
dc.identifier.urihttps://hdl.handle.net/11501/1604
dc.identifier.wosWOS:001407390700001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakScopus
dc.indekslendigikaynakWeb of Science
dc.institutionauthorÇoban, Ozan
dc.institutionauthorid0000-0002-1506-4619
dc.language.isoen
dc.publisherElsevier Ltd
dc.relation.ispartofRadiation Physics and Chemistry
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectFree Volume
dc.subjectGraphene Oxide
dc.subjectPositron Annihilation
dc.subjectPVdF
dc.subjectPVP
dc.titleFree volume impact on ionic conductivity of PVdF/GO/PVP solid polymer electrolytes via positron annihilation approach
dc.typeArticle

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