|
Authors
|
Ghanti, B.; Kamble, R.; Komber, H.; Voit, B.; Banerjee, S.
|
|
Title
|
High proton-conducting phosphine oxide- and pyridinyl-based fluoro-sulfonated proton exchange membranes with enhanced chemical stability
|
|
Date
|
01.03.2025
|
|
Number
|
0
|
|
Abstract
|
For long-term fuel cell application, the fabrication of a high-conductive and chemically durable sulfonated aromatic proton exchange membrane (PEM) is the most demanding requirement. Herein, we have synthesized a new series of phosphine oxide and pyridinyl moieties-based aromatic sulfonated polytriazoles (SPTs) with high ion exchange capacity values (IECw: 1.84–3.13 meqiv/g). The chemical structures of the PFPYSNa-XX copolymers are confirmed by various spectroscopy techniques. The inherent viscosity values (ηinh: 1.34–1.54 dL/g) and size exclusion chromatography results (SEC; weight-average molecular weight: 72–260 kDa, polydispersity index: 1.65–2.39) of the copolymers indicate the formation of high molecular weight SPTs by the “Click” polymerization reaction. The PFPYSH-XX polymers demonstrate excellent thermal stability (Td5%: 250-294 °C) and appropriate mechanical properties. The fabricated PFPYSH-XX copolymer membranes reveal an inter-connected hydrophobic-hydrophilic phase-segregated morphology in various morphological investigations. Despite the high IEC values, the PFPYSH-XX membranes display better oxidative stability than the literature-reported analogous SPT membranes (τ ≥ 22 h). Also, all copolymers possess high residual weight (>94 %), and no cracks or pinholes are produced after an hour of Fenton's test at 80 °C. The PFPYSH-XX membranes exhibit exceptionally high proton conductivity (σ: 60–206 mS/cm at 80 °C), even higher than that of Nafion-117.
|
|
Publisher
|
Elsevier
|
|
Wikidata
|
|
|
Citation
|
Journal of Power Sources 631 (2025) 236201
|
|
DOI
|
https://doi.org/10.1016/j.jpowsour.2025.236201
|
|
Tags
|
|
