Hydrophobic-hydrophilic comb-type quaternary ammonium-functionalized SEBS copolymers for high performance anion exchange membranes

Munsur, Abu Zafar Al; Hossain, Iqubal; Nam, Sang Yong; Chae, Ji Eon; Kim, Tae Hyun

doi:10.1016/j.memsci.2020.117829

Cited by 72 publications

(41 citation statements)

References 47 publications

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“…Moderate water absorption in AEMs will facilitate the transportation of ions; however, excessive water may cause more swelling, which is detrimental to the application of AEMFCs. Encouragingly, studies have proven that obvious hydrophilic–hydrophobic phase separation is conducive to the improvement of conductivity. − Thus, many strategies for facilitating this microstructure have been proposed by researchers. One of the most common methods is remotely grafting cation groups to construct side-chain-type AEMs (Scheme b, type 1).…”

Section: Introductionmentioning

confidence: 99%

Multication Cross-Linked Poly(p-terphenyl isatin) Anion Exchange Membranes for Fuel Cells: Effect of Cross-Linker Length on Membrane Performance

Zhao

Long

Wang

et al. 2021

ACS Appl. Energy Mater.

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As a key component of anion exchange membrane fuel cells (AEMFCs), anion exchange membranes (AEMs) have been investigated in the last decades. Herein, a series of multication cross-linkers were introduced into side-chain-type poly(p-terphenyl isatin) to develop high-performance and long-term stable AEMs. Additionally, the effects of the hydrophilic cross-linker length on the membrane performance were systematically investigated. The resulting cross-linked membranes possess a low swelling ratio (<18% at 80 °C) and high tensile strength (51.1−58.3 MPa). Notably, the cross-linker length influences the AEM internal morphology. With hexyl as the spacer between backbones and cation groups in the cross-linker, 0.9q-PTI-6C exhibits the highest hydroxide ion conductivity of 118.5 mS/cm at 80 °C, which is ascribed to well-developed ion channels. Furthermore, alkyl spacer chains and cross-linked networks contribute to the excellent alkali stability of membranes. After immersion in 2 M NaOH for 1200 h at 80 °C, 0.9q-PTI-8C only shows 11 and 12.7% losses in ion conductivity and ion exchange capacity (IEC), respectively. The fuel cell fabricated using 0.9q-PTI-6C can achieve the maximum power density of 310 mW/cm 2 at 80 °C.

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Section: Introductionmentioning

confidence: 99%

Multication Cross-Linked Poly(p-terphenyl isatin) Anion Exchange Membranes for Fuel Cells: Effect of Cross-Linker Length on Membrane Performance

Zhao

Long

Wang

et al. 2021

ACS Appl. Energy Mater.

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“…Compared to the AEM with the aromatic backbone such as PPO, poly(olefin) is more flexible and has higher hydrophobicity, both of which improve the nanosegregation. Many recent advances in AEMs are based on SEBS, ,,,,, including special designs such as crosslinking side chains or multication side chains. , …”

Section: Introductionmentioning

confidence: 99%

Designing Highly Conductive Block Copolymer-Based Anion Exchange Membranes by Mesoscale Simulations

Lee

2021

J. Phys. Chem. B

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Hydroxide ion conductivity is a key aspect of anion exchange membranes and is mainly determined by the nanoscale membrane morphologies. Fundamental understanding of the structural and transport properties of membranes in terms of polymer architectures is crucial for future development of membrane-based applications. Using mesoscale simulations, this work predicts the mesostructure of the hydrated triblock copolymers; the designed polymers are composed of aromatic (polyphenylene oxide, PPO) or aliphatic (polystyrene-ethylene-butylene-styrene, SEBS) backbones, with cationic side chains being modified by hydrophobic or hydrophilic spacers. For PPO-based polymers, using octyl spacers creates a meshlike water network, yielding ion conductivity equal to 30.6 mS/ cm at room temperature. For SEBS-based polymers, the nonmodified form is sufficient to produce ion-conducting pathways. Adding hydrophobic spacers further enhances the nanosegregation, and the membranes provide similar conductivity at a lower ion exchange capacity and water content. Adding hydrophilic spacers, however, has negative impacts on the ion transport. The side chains are in the stretched configurations, which sterically hinder the mobility of water and hydroxide ions. Such a resistance can be overcome by adapting multication side-chain designs, where large water channels are formed, yielding ion conductivity as high as 32.8 mS/cm.

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“…The formation of a good microphase separation morphology in the membrane through a rational side-chain design is helpful to solve the above problems . In the past decades, researchers have designed a series of novel side-chain structures by incorporating spacers (i.e., the link between cation’s central atom and backbone) − and/or extenders (i.e., the “tail” attached to the cation’s central atom), − additional side chains, − branched side chains, − and multication side chains. ,− The above side-chain structures imparted the AEMs higher ion conductivity and chemical stability, but improvement of membrane performance still depends on a relatively high IEC, which may harm the long-term robustness of the membranes.…”

Section: Introductionmentioning

confidence: 99%

Dual-Side-Chain-Grafted Poly(phenylene oxide) Anion Exchange Membranes for Fuel-Cell and Electrodialysis Applications

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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Anion exchange membranes (AEMs) usually suffer from the "trade-off" between ion conduction and stability. In this work, a series of dual-side-chain-grafted poly(phenylene oxide) AEMs were synthesized to explore how the side-chain architectures influence membrane performance. Our investigations suggest that the AEM containing both a long hydrophobic extender (attached to the cation's central atom) and a hydrophilic additional side chain (beside the cation) show high hydroxide conductivity (21.3 mS/cm at 30 °C) and good chemical and dimensional stability (90.5% conductivity retention after 1 M NaOH treatment at 60 °C for 528 h). In addition, when a tri-cation side chain and a hydrophobic side chain are incorporated simultaneously, the resulting AEM shows further improved conductivity and stability (50.0 mS/cm at 30 °C; 90.6% conductivity retention after 1 M NaOH treatment at 60 °C for 528 h); it also shows excellent electrochemical performance when applied in a fuel cell and an electrodialyzer, accomplishing a peak power density of 506 mW/cm 2 and a current efficiency of 96.11%, respectively. Our side-chain manipulation strategy provides a new and effective pathway to balance the ionic conductivity and stability of AEMs.

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Hydrophobic-hydrophilic comb-type quaternary ammonium-functionalized SEBS copolymers for high performance anion exchange membranes

Cited by 72 publications

References 47 publications

Multication Cross-Linked Poly(p-terphenyl isatin) Anion Exchange Membranes for Fuel Cells: Effect of Cross-Linker Length on Membrane Performance

Multication Cross-Linked Poly(p-terphenyl isatin) Anion Exchange Membranes for Fuel Cells: Effect of Cross-Linker Length on Membrane Performance

Designing Highly Conductive Block Copolymer-Based Anion Exchange Membranes by Mesoscale Simulations

Dual-Side-Chain-Grafted Poly(phenylene oxide) Anion Exchange Membranes for Fuel-Cell and Electrodialysis Applications

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