Tailored proton conductive membranes of PVdF-co-HFP: Investigating the synergistic effects of ammonium tetrafluoroborate and phosphoric acid dopants on dielectric characteristics

YILMAZOĞLU, Mesut; Abacı, Ufuk; ERDEMİ, Hamit; Çoban, Ozan

doi:10.1016/j.psep.2024.09.112

Tailored proton conductive membranes of PVdF-co-HFP: Investigating the synergistic effects of ammonium tetrafluoroborate and phosphoric acid dopants on dielectric characteristics

Yazarlar (4)

Doç. Dr. Mesut YILMAZOĞLU Yalova Üniversitesi, Türkiye

Ufuk Abacı Kocaeli Üniversitesi, Türkiye

Prof. Dr. Hamit ERDEMİ Yalova Üniversitesi, Türkiye

Ozan Çoban İstanbul Gedik Üniversitesi, Türkiye

Makale Türü	Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale)
Dergi Adı	Process Safety and Environmental Protection (Q1)
Dergi ISSN	0957-5820 Wos Dergi Scopus Dergi
Dergi Tarandığı Indeksler	SCI-Expanded
Makale Dili	İngilizce	Basım Tarihi	11-2024
Cilt / Sayı / Sayfa	191 / 1 / 1994–2006	DOI	10.1016/j.psep.2024.09.112
Makale Linki	http://dx.doi.org/10.1016/j.psep.2024.09.112

Özet

This study investigates the structural, thermal, and dielectric properties of pure PVdF-co-HFP matrix and its composite electrolytes, PVdF-co-HFP/NH4BF4[x], both before and after PA doping, using FTIR, SEM, TGA, and dielectric analyses. FTIR spectra reveal characteristic vibrational bands, confirming the presence of various functional groups and phases. SEM images display a smooth and homogeneous surface morphology for pure PVdF-co-HFP, while the composite electrolytes exhibit irregular dispersion of NH4BF4 salt and rougher surfaces upon PA doping. TGA analysis shows that the onset of thermal degradation occurs at approximately 370 ℃ for pure PVdF-co-HFP, while PA-doped samples demonstrate higher decomposition temperatures, exceeding 400 ℃ due to hydrogen bonding and ionic complex formation. The presence of NH4BF4 and PA doping also affects the crystallinity of the PVdF-co-HFP matrix, notably shifting the transition temperatures of the alpha and beta phases. Ionic conductivity measurements indicate that PA doping significantly enhances conductivity by increasing charge carrier concentration and facilitating ion transport. PA-doped PVdF-co-HFP/NH4BF4[10] showed the highest conductivity reaching 1.68 × 10⁻³ S.cm⁻¹ at 1 MHz and 400 K. Dielectric studies reveal frequency-dependent behavior, with dielectric constant (ε') and loss (ε") showing distinct trends influenced by salt concentration and PA doping. The dielectric tangent loss (tanδ) of PA-doped PVdF-co-HFP/NH4BF4 composite membranes exhibits frequency and temperature dependence. At higher temperatures, tanδ increases with frequency, showing a resonance peak that shifts towards higher frequencies. The study elucidates the impact of PA doping on the structural, thermal, and electrochemical performance of PVdF-co-HFP/NH4BF4 composites, providing insights for their potential applications in advanced electrolyte systems.

Anahtar Kelimeler

PVdF-co-HFP | Ionic conductivity | Dielectric | Ammonium salt | Phosphoric acid

Science Direct

BM Sürdürülebilir Kalkınma Amaçları

Atıf Sayıları
WoS	1
SCOPUS	1
Google Scholar	1

Tailored proton conductive membranes of PVdF-co-HFP: Investigating the synergistic effects of ammonium tetrafluoroborate and phosphoric acid dopants on dielectric characteristics

Dergi Adı	PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
Yayıncı	Institution of Chemical Engineers
Açık Erişim	Hayır
ISSN	0957-5820
E-ISSN	1744-3598
CiteScore	12,5
SJR	1,473
SNIP	1,709

Tailored proton conductive membranes of PVdF-co-HFP: Investigating the synergistic effects of ammonium tetrafluoroborate and phosphoric acid dopants on dielectric characteristics

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