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

YILMAZOĞLU, Mesut; OKKAY, Hikmet; Abacı, Ufuk; TEKAY, Emre; Çoban, Ozan; Veziroğlu, Sümeyye; Yahşi, Ayşe Yumak; Tav, Cumali; Yahşi, Uğur

doi:10.1016/j.radphyschem.2025.112539

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

Yazarlar (9)

Doç. Dr. Mesut YILMAZOĞLU Yalova Üniversitesi, Türkiye

Doç. Dr. Hikmet OKKAY Yalova Üniversitesi, Türkiye

Ufuk Abacı Kocaeli Üniversitesi, Türkiye

Doç. Dr. Emre TEKAY Yalova Üniversitesi, Türkiye

Ozan Çoban İstanbul Gedik Üniversitesi, Türkiye

Sümeyye Veziroğlu Marmara Üniversitesi, Türkiye

Ayşe Yumak Yahşi Marmara Üniversitesi, Türkiye

Cumali Tav Marmara Üniversitesi, Türkiye

Uğur Yahşi Marmara Üniversitesi, Türkiye

Makale Türü	Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale)
Dergi Adı	Radiation Physics and Chemistry (Q1)
Dergi ISSN	0969-806X Wos Dergi Scopus Dergi
Dergi Tarandığı Indeksler	SCI-Expanded
Makale Dili	İngilizce	Basım Tarihi	01-2025
Cilt / Sayı / Sayfa	229 / 1 / –	DOI	10.1016/j.radphyschem.2025.112539
Makale Linki	https://doi.org/10.1016/j.radphyschem.2025.112539

Özet

This 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.

Anahtar Kelimeler

Free volume | Graphene oxide | Positron annihilation | PVdF | PVP

Science Direct

BM Sürdürülebilir Kalkınma Amaçları

Atıf Sayıları
SCOPUS	1

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

Dergi Adı	RADIATION PHYSICS AND CHEMISTRY
Yayıncı	Elsevier Ltd
Açık Erişim	Hayır
ISSN	0969-806X
E-ISSN	1879-0895
CiteScore	5,6
SJR	0,543
SNIP	1,076

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

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