Influence of TiO2 nanofillers on the dielectric response of proton conducting sulfonated polyether ether ketone/ionic liquid electrolytes

OKKAY, Hikmet; Abacı, Ufuk; YILMAZOĞLU, Mesut

doi:10.1016/j.coco.2025.102466

Influence of TiO2 nanofillers on the dielectric response of proton conducting sulfonated polyether ether ketone/ionic liquid electrolytes

Yazarlar (3)

Doç. Dr. Hikmet OKKAY Yalova Üniversitesi, Türkiye

Ufuk Abacı Kocaeli Üniversitesi, Türkiye

Doç. Dr. Mesut YILMAZOĞLU Yalova Üniversitesi, Türkiye

Makale Türü	Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale)
Dergi Adı	Composites Communications (Q1)
Dergi ISSN	2452-2139 Wos Dergi Scopus Dergi
Dergi Tarandığı Indeksler	SCI-Expanded
Makale Dili	İngilizce	Basım Tarihi	08-2025
Cilt / Sayı / Sayfa	57 / 1 / 102466–0	DOI	10.1016/j.coco.2025.102466
Makale Linki	https://doi.org/10.1016/j.coco.2025.102466

Özet

The impacts of titanium dioxide (TiO2) filler on the dielectric response of ionic liquid (IL)-doped sulfonated polyether ether ketone (SPEEK) electrolytes have been investigated. Neat SPEEK, IL-doped SPEEK (SPIL), and IL-doped TiO2-filled SPEEK (SPILTO) composite membranes were prepared with the conventional solution cast method and characterized by various techniques. Fourier-transform infrared (FTIR) spectroscopy analyses confirmed the sulfonation and also showed the dispersion of imidazole and TiO2. Thermogravimetric analysis (TGA) results showed that all composites are thermally stable to comply with electrochemical requirements up to nearly 150 °C. SPILTO-1 composite exhibited a storage modulus of 74 MPa and a glass transition temperature (Tg) of 140 °C. More than 1 wt% TiO2 fillers resulted in heterogeneous membrane surfaces for SPILTO samples. The SPILTO-1 electrolyte showed a maximum conductivity (σ) of 8.1 × 10⁻⁴ S/cm and a significant proton transport potential even in completely anhydrous conditions. Charge carrier migration and accumulations resulted in high dielectric constant (ε′) values and major polarization, particularly at lower frequencies. The dielectric permittivity of the SPEEK matrix increased dramatically with the addition of IL and TiO2 fillers. The substantial ε′ values of SPILTO-1 showed that the combination of IL and TiO2 increases both the number of free mobile ions and the charge stored in the electrolytes. In the relaxation behaviors, the shortest relaxation time (τ) of 1.34 μs at 300 K corresponded to the highest conductivity of SPILTO-1 electrolyte.

Anahtar Kelimeler

SPEEK | TiO2 | Ionic liquid | Dielectric polarization | Relaxation time

Science Direct

BM Sürdürülebilir Kalkınma Amaçları

Atıf Sayıları
WoS	3
SCOPUS	4
Google Scholar	4

Influence of TiO2 nanofillers on the dielectric response of proton conducting sulfonated polyether ether ketone/ionic liquid electrolytes

Dergi Adı	Composites Communications
Yayıncı	Elsevier Ltd
Açık Erişim	Hayır
ISSN	2452-2139
E-ISSN	2452-2139
CiteScore	12,4
SJR	1,416
SNIP	1,215

Influence of TiO2 nanofillers on the dielectric response of proton conducting sulfonated polyether ether ketone/ionic liquid electrolytes

Paylaş