Interplay between Structure and Conduction Mechanism of Piperazinium‐Functionalized Poly[Ethylene Pyrrole/Ethylene Ketone/Propylene Ketone] Anion Conducting Membranes
Year: 2025
Type: article
Abstract: Anion exchange membranes (AEMs) have been proposed as potential alternatives to proton exchange membranes in electrochemical energy conversion and storage devices. Herein, the synthesis of a series of AEMs based on random piperazinium‐methyl N‐substituted poly[ethylene pyrrole/ethylene ketone/propylene ketone] (P‐FPKK) and their structural characterization together with the elucidation of the ion conduction mechanism are reported. Different copolymers are prepared by a Paal–Knorr reaction of a poly(ethylene ketone/propylene ketone) copolymer precursor with 1‐(2‐aminoethyl) piperazine, modulating the molar ratios amine/(1,4‐diketonic repeat units of copolymer) from ¼ to 3. The composition and structure are investigated by elemental analysis, attenuated total reflectance–Fourier transform infrared spectroscopy, nuclear magnetic resonance, and X‐ray diffraction. The degree of functionalization, f, plays a crucial role in controlling the thermal, morphological, and electrochemical properties of the P‐FPKKf(I)g and P‐FPKKf(OH)g membranes. P‐FPKK0.49(OH)0.45 displays an ionic conductivity of 11.3 mS cm−1 at 60 °C. After alkaline aging (1 m KOH at 60 °C for 336 h), retaining its structural integrity and 25% of its initial ionic conductivity value, suggesting them as possible candidates for testing in alkaline energy conversion and storage devices. Furthermore, broadband electrical spectroscopy studies reveal that the long‐range charge migration processes are modulated by the segmental motion of the backbone chains of the copolymer matrix.
Source: ChemSusChem
Authors: Afaaf Rahat Alvi, Keti Vezzù, Francesco Lanero, Paolo Sgarbossa, Angeloclaudio Nale, Vito Di Noto
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,550
OpenAlex ID: W4409537447