Correlation of proton conductivity and free volume in sulfonated polyether ether ketone electrolytes: a positron annihilation lifetime spectroscopy study

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dc.contributor.authorLahmuni, Muhammet
dc.contributor.authorYılmazoğlu, Mesut
dc.contributor.authorAbacı, Ufuk
dc.contributor.authorÇoban, Ozan
dc.contributor.authorYumak Yahşi, Ayse
dc.contributor.authorTav, Cumali
dc.contributor.authorYahşi, Uğur
dc.date.accessioned2024-10-31T09:23:35Z
dc.date.available2024-10-31T09:23:35Z
dc.date.issued2025
dc.departmentFakülteler, Mühendislik Fakültesi, Metalurji ve Malzeme Mühendisliği Bölümü
dc.description.abstractProton-conducting polymers play a pivotal role in clean energy technologies and various industrial applications, with a significant emphasis on enhancing energy efficiency and minimizing environmental impact. Sulfonated polyether ether ketone (SPEEK), which is renowned for its proton conductivity, has emerged as a key material in electrochemical processes, notably in proton exchange membrane (PEM) fuel cells. This study investigated the proton conductivity and dielectric behavior of SPEEK electrolytes at varying degree of sulfonation (DS) of 65% and 80%, correlating these properties with free volume profiles determined by positron annihilation lifetime spectroscopy (PALS). The SPEEK-65 and SPEEK-80 electrolytes were prepared via a controlled sulfonation process and characterized by FTIR, TGA, and SEM analyses. Proton conductivity and dielectric measurements were conducted at temperatures ranging from 300 to 370 K and frequencies ranging from 20 Hz to 1 MHz. The results revealed that SPEEK-80 exhibited a maximum proton conductivity of 3.4 × 10−2 S/m at 300 K and 1 MHz, which was significantly greater than the 4.38 × 10−3 S/m observed for SPEEK-65 under the same conditions. PALS analysis demonstrated a notable increase in free volume with increasing DS, with SPEEK-80 showing a higher o-Ps lifetime and intensity, indicating larger free volume sizes and fractions. These findings underscore the critical interplay between DS, free volume, and proton conductivity, offering insights into optimizing SPEEK-based electrolytes for advanced electrochemical applications.
dc.description.sponsorshipYalova Üniversitesi
dc.identifier.doi10.1016/j.radphyschem.2024.112327
dc.identifier.issn0969-806X
dc.identifier.issn1879-0895
dc.identifier.scopus2-s2.0-85206634378
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.radphyschem.2024.112327
dc.identifier.urihttps://hdl.handle.net/11501/1548
dc.identifier.volume226
dc.indekslendigikaynakScopus
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.subjectDielectric
dc.subjectFree Volume
dc.subjectPALS
dc.subjectPositronium
dc.subjectSPEEK
dc.titleCorrelation of proton conductivity and free volume in sulfonated polyether ether ketone electrolytes: a positron annihilation lifetime spectroscopy study
dc.typeArticle

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