Alkaline anion exchange membrane containing pyrene-based π-π stacking interactions

Highly Ion-Conductive and Alkaline Stable Anion Exchange Membranes Containing Bulky Aryl Units and Symmetric bis-Piperidinium Branches

“…As shown in Table , IEC also had an obvious effect on the OH – conductivity, especially at high temperatures. For example, at 80 °C, the OH – conductivity of the QPTPDP-40-OH membrane with the highest IEC is almost two times higher than that of QPTPDP-16-OH membrane with the lowest IEC, In addition, QPTPDP- x -OH membranes showed comparable conductivity at a given IEC, with some aryl ether-free AEMs reported in recent years ,,− (Table S6). The high conductivity of QPTPDP- x -OH membranes was mainly attributed to the introduction of the symmetric branching side chains, which could enhance the mobility of ions and promote the microphase separation.…”

Alkaline Membranes toward Electrochemical Energy Devices: Recent Development and Future Perspectives

“…It enabled the PFTP- x membrane to demonstrate excellent performance not only in fuel cells (PPD of 2.34 W cm –2 , durability of 200 h) but also in the water electrolyzers (current density of 7.68 A cm –2 at 2.0 V with 1 M KOH fed, durability more than 1000 h). Additionally, some novel monomers such as 1,1′-binaphthalene and pyrene were exploited to enhance the interaction between molecular chains and improve dimensional stability by regulating the polymer geometry configuration without sacrificing conductivity and alkali stability , (Figure d). Most notably, the adopted cross-linking strategy enables fabricated alkaline membranes to exhibit extending operating durability.…”

“…(c) Chemical structure of poly­(arylene piperidinium) − and related H 2 /O 2 fuel cell and water electrolytic performance. (d) Representative membrane structure with interactions between molecular chains. , (e) Chemical structure of branched poly­(terphenyl piperidinium)­s and its durability in fuel cells . (f) Chemical structure of cross-linked MTCP-50 and its durability in neutral aqueous organic redox flow batteries, water electrolyzers, and fuel cells (open-circuit voltage durability) .…”

Polydiallylammonium interpenetrating cationic network ion-solvating membranes for anion exchange membrane water electrolyzers

“…The key requirements for AEMs are high ionic conductivity, good mechanical strength, and superior alkaline stability. [8][9][10][11] High ion exchange capacity (IEC) is generally required for high ionic conductivity, but high IEC usually tends to trade-off with mechanical strength and alkaline stability due to high hydration. 12 Previous studies have investigated ammonium-functionalized polyphenyleneoxide (PPO) and poly(ether ether ketone) (PEEK) based membranes, which are vulnerable to main-chain scission due to cleavage of aryl ether groups during operation.…”