Crosslinked naphthalene-based triblock polymer anion exchange membranes for fuel cells

Zhu, Zhao Yu; Gou, Wei; Chen, Jia Hui; Zhang, Qiu Gen; Zhu, Ai Mei

doi:10.1016/j.memsci.2021.119569

Cited by 30 publications

(27 citation statements)

References 64 publications

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“…Among them, the hydrogen fuel cell (HFC) technology, as an important hydrogen energy utilization technology, has become a crucial part of high value-added applications with the vigorous promotion of hydrogen energy . Anion exchange membrane FCs (AEMFCs) using AEMs as electrolytes stand out among many hydrogen fuel cells by virtue of their advantages of fast start-up, excellent power, and stable operation. , However, the quality of components affects the performance of AEMFCs, among which AEMs, ionomers, and membrane electrodes are the most critical . Recently, the exploration focus of AEMs has shifted from the traditional ether-contained backbone to the ether-free backbone to try to upgrade the comprehensive performance, but it is still difficult to achieve a win–win situation between excellent performance and stability. − …”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrophobic Side Chain Length on Poly(carbazolyl terphenyl piperidinium) Anion Exchange Membranes

Cai

Gao

et al. 2022

ACS Appl. Energy Mater.

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In recent years, with the continuous application of superacid-catalyzed condensation reaction in the preparation of anion exchange membranes (AEMs), a number of AEMs with excellent performance have been designed. Among them, the method to copolymerize two aromatic compounds with piperidone via a superacid-catalyzed reaction to synthesize anionic conducting copolymers has been widely discussed by researchers. Here, we focus on the introduction of poly(N-alkylcarbazole-co-terphenyl N,N′-dimethylpiperidinium) (PCTP-n), which is formed by copolymerizing different chain lengths of N-alkylcarbazole (AHC, n = 2, 4, and 6) and p-terphenyl with 1-methyl-4-piperidone (1M4P). As a result of the high-curvature backbone and hydrophobic flexible side chains, the PCTP-n AEMs show comprehensive performance advantage. Among them, the PCTP-6 membrane, with an ultralow swelling (7.9%) and an excellent OH– conductivity retention (91.9% in 2 M NaOH at 80 °C after 1080 h), highlights high dimensional stability and alkaline resistance. Then, the PCTP-2 membrane displays excellent mechanical robustness (EB: 40%, TS: 20 MPa) and a decent OH– conductivity (134 mS cm–1 at 80 °C). Furthermore, the PCTP-2-based single cell exhibits a decent power density of 542 mW cm–2 under H2–O2 condition.

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Section: Introductionmentioning

confidence: 99%

Effect of Hydrophobic Side Chain Length on Poly(carbazolyl terphenyl piperidinium) Anion Exchange Membranes

Cai

Gao

et al. 2022

ACS Appl. Energy Mater.

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“…As a critical component, effective anion-exchange membranes (AEMs) are widely used in electrochemical technologies, such as anion-exchange membrane fuel cells (AEMFCs), , flow batteries, , and water electrolysis. , Typically, AEMs are composed of polymer backbones, such as poly(sulfone)s, poly(arylene ether ketone)s, , and poly(phenylene oxide)s, ,, and cationic groups . However, recent studies have shown that the polymer backbone with electron withdrawing groups is chemically unstable under alkaline conditions due to the backbone cleavage resulting from hydroxide ion attack .…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, most studies use hydrophilic instead of hydrophobic cross-linkers to modify AEMs. Hydrophilic cross-linkers can decrease swelling and increase OH – conductivity simultaneously. ,,, For example, multication cross-linkers were used in AEMs to improve the ion channels of the membranes. In our recent report, we have successfully prepared several tunable multication cross-linked membranes.…”

Section: Introductionmentioning

confidence: 99%

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Cross-Linked Anion-Exchange Membranes with Dipole-Containing Cross-Linkers Based on Poly(terphenyl isatin piperidinium) Copolymers

Tian

et al. 2022

ACS Appl. Mater. Interfaces

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To balance the ionic conductivity and dimensional stability of anion-exchange membranes (AEMs), several cross-linked ether-free poly(terphenyl isatin piperidinium) copolymers were synthesized using 1,2-bis(2-aminoethoxy)ethane as a cross-linker. By introducing an alkyl diamine-based hydrophobic cross-linker as a control, the effects of the dipolar-molecule-containing cross-linker on the comprehensive performance of the membranes were investigated. Cation–dipole interactions between the cations and the hydrophilic ethylene oxide cross-linker enhance the self-assembly capability of the cationic groups. The introduction of the rotatable ethylene oxide cross-linker facilitates the flexibility of the cross-linked networks, thereby promoting hydrophilic/hydrophobic phase separation and inhibiting excessive swelling of the corresponding AEMs simultaneously. The resulting PTPBHIN-O19 membrane showed a high hydroxide conductivity (151.69 mS cm–1) and low swelling ratio (10.53%) at 80 °C. Furthermore, owing to the cross-linked structure and ether-free polymer backbone with high alkali resistance, the membranes treated in 3 M NaOH at 80 °C for 1600 h maintained ≥85% of their hydroxide conductivity, indicating excellent alkaline stability. A H2/O2 fuel cell based on the PTPBHIN-O19 AEM exhibited a maximum power density of 398 mW cm–2 at 515 mA cm–2.

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“…To investigate this effect, some pioneers such as Bai, Hickner, Wang, Xu, and Hu demonstrated the possibility of preparing AEMs with different ionic concentrations, and the ion-conducting property of the corresponding AEMs was also improved by structure optimization (Figure ). In addition, different functional groups, such as quaternary ammonium, − piperidinium, − imidazolium, and other cationic groups, were also introduced into AEMs to study their influence on the AEM property . However, the influence of ionic concentration and substituent on the ion-conducting property was only studied by a few groups, which may be owing to the complicated synthetic chemistry and the lack of suitable polymer precursors.…”

Section: Introductionmentioning

confidence: 99%

Role of Ionic Concentration and Distribution in Anionic Conductivity: Case Study on a Series of Cobaltocenium-Containing Anion Exchange Membranes with Precise Structure Control

Yang

Yan

et al. 2022

Macromolecules

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Three new anion exchange membranes (AEMs) (P1, P2, P3) with varied numbers (1, 2, 3) of cobaltocenium substituents were synthesized by ring-opening metathesis polymerization (ROMP). The living polymerization characteristic of ROMP endows the resulting AEMs with tunable ionic concentration and precise structure control, which provide an ideal model to investigate the influence of ionic concentration and substituent on the ion-conducting property of AEMs. According to Mohr titration and the alternating-current impedance method, the as-prepared AEMs demonstrated an obvious ionic concentration and substituent influence on ionic conductivity in an ordering of P2 > P3 > P1. In addition, the hydrophilic/hydrophobic microphase separation structures of the three AEMs were observed by atomic force microscopy (AFM), transmission electron microscopy (TEM), and small-angle X-ray scattering (SAXS). To further verify the relationship between ionic concentration, substituent, and ionic conductivity, molecular simulation was also used to calculate the ionic diffusivity of the three AEMs, and the result of simulation computation was consistent with the experimental result. Moreover, a tentative anion exchange membrane fuel cell (AEMFC) performance test also indicates the corresponding sequence of P2 > P3 > P1. The current work may provide an effective method for the rational design and preparation of AEMs, as well as guidance in investigating the structure−property relationship.

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Crosslinked naphthalene-based triblock polymer anion exchange membranes for fuel cells

Cited by 30 publications

References 64 publications

Effect of Hydrophobic Side Chain Length on Poly(carbazolyl terphenyl piperidinium) Anion Exchange Membranes

Effect of Hydrophobic Side Chain Length on Poly(carbazolyl terphenyl piperidinium) Anion Exchange Membranes

Cross-Linked Anion-Exchange Membranes with Dipole-Containing Cross-Linkers Based on Poly(terphenyl isatin piperidinium) Copolymers

Role of Ionic Concentration and Distribution in Anionic Conductivity: Case Study on a Series of Cobaltocenium-Containing Anion Exchange Membranes with Precise Structure Control

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