Mechanically flexible bulky imidazolium-based anion exchange membranes by grafting PEG pendants for alkaline fuel cells

Poly(phenylene oxide)-Based Anion Exchange Membranes Having Linear Cross-Linkers or Star Cross-Linkers

“…Because advanced AEMs have been reported in recent years, the peak power density of AEMFCs has exceeded 1000 mW/cm 2 , such as fluoropoly­(olefin)-based AEMs of Hickner’s group, QAPPT-based AEMs of Zhuang’s group, PAP-based AEMs of Yan’s group, PDTP-basd AEMs of Lee’s group, and norbornene-based AEMs of Kohl’s group . However, as shown in Table , sc DQPPO-40 shows competitive fuel cell performance in PPO-based AEMs. ,,,,− In fact, in addition to AEMs, there are many other factors that affect AEMFCs performance, such as MEA preparation technology and fuel cell operation conditions. Following work will be focused on how to improve the performance and long-term stability of AEMFCs.…”

Four-arm star-shaped high-performance poly(aryl piperidine) anion exchange membranes for fuel cells

“…The cell voltage declined from 0.76 to 0.67 V at 0.2 A cm −2 and 60 °C in the rst 5 h, while decaying slowly to 0.53 V in the following 145 h. The voltage decline may be caused by factors such as physical/chemical stability of the AEMs, the activity of the catalyst, and the water environment in the single fuel cell. 15,33,34 The voltage uctuation during the durability test was probably due to water balancing problems caused by improper anode and cathode humidity. It is important to note that no degradation of the qPTTP-7 membrane occurred aer the fuel cell operation as indicated by the 1 H NMR spectrum shown in Fig.…”

“…[11][12][13][14] At present, the main challenge obstructing the practical development of AEMFCs is to design AEMs with excellent ion conductivity and high alkali stability. [15][16][17] One pivotal avenue towards enhancing ion conductivity resides in the augmentation of ion exchange capacity (IEC). However, such improvements in IEC oen lead to higher water uptake (WU) and swelling ratio (SR), which may damage the mechanical stability of AEMs.…”

Current Challenges on the Alkaline Stability of Anion Exchange Membranes for Fuel Cells

“…The cross-linking of rigid aromatic polymers with flexible chains is a useful way to promote membrane flexibility. Li et al [117] grafted hydrophilic and flexible polyethylene glycol chains onto imidazolium to prepare cross-linked PPO-based AEMs. These AEMs exhibited excellent film-formed abilities with reasonable mechanical strengths of 18.7-31.8 MPa and high elongations at break of 21.2 %-133.3 %, as well as good alkaline stability after immersion in 1 M NaOH at 80 °C for 1248 h. To further improve the alkaline stability of cross-linked membranes, Ding et al [118] cross-linked ether-free polyfluorene with flexible aliphatic chains.…”