Di-piperidinium-crosslinked poly(fluorenyl-<i>co</i>-terphenyl piperidinium)s for high-performance alkaline exchange membrane fuel cells

Chen, Nanjun; Park, Jong Hyeong; Hu, Chuan; Wang, Ho Hyun; Kim, Hae Min; Kang, Na Yoon; Lee, Young Moo

doi:10.1039/d1ta10178a

Cited by 60 publications

(27 citation statements)

References 37 publications

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“…However, this result is not ideal or satisfactory from the application perspective. The construction of MEA, the chemical stability of the anion exchange membrane, the management of water, and the activity of the catalyst in the AEMFCs may be the vital factors that lead to the degradation of the cell performance. , In our future work, we will continue to optimize the AEMs and MEA structures.…”

Section: Resultsmentioning

confidence: 99%

SEBS-Based Anion Exchange Membrane Grafted with N-Spirocyclic Quaternary Ammonium Cations for Fuel Cells

Sang

Liu

Wang

et al. 2022

ACS Appl. Energy Mater.

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To balance the water absorption, alkali stability, and ion conductivity of anion exchange membranes, we synthesize high-performance anion exchange membranes (AEMs) based on 3-(3-(piperidin-4-yl)propyl)-6azaspiro[5.5]undecan-6-ium bromide (p-ASU), 3-amino-6-azaspiro[5.5]undecan-6-ium (a-ASU), and trimethylamine (TMA). By fully grafting ASU and TMA cations onto poly(styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS), obvious microphase separation structures are well-developed in the anion exchange membranes. The swelling ratio of SEBS-ASU-TMA membranes is less than 39% on account of the introduction of larger sterically hindered ASU cations. In addition, the SEBS-p-ASU-TMA-40 membrane with an alkyl spacer chain exhibits a higher efficiency for ion transport channels and higher ionic conductivity compared to SEBS-a-ASU-TMA-40 without the alkyl spacer chain. The SEBS-p-ASU-TMA-40 attained a OH − conductivity of 96.6 mS cm −1 at 80 °C. Furthermore, stable N-spirocyclic quaternary ammonium cations contributed to the good chemical stability of SEBS-p-ASU-TMA-40, which exhibits 17% degradation in OH − conductivity after 1000 h of alkali stability testing. The H 2 /O 2 fuel cell assembled by SEBS-p-ASU-TMA-40 exhibits a maximum power density of 286 mW cm −2 at 80 °C.

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Section: Resultsmentioning

confidence: 99%

SEBS-Based Anion Exchange Membrane Grafted with N-Spirocyclic Quaternary Ammonium Cations for Fuel Cells

Sang

Liu

Wang

et al. 2022

ACS Appl. Energy Mater.

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“…The AEMs maintained their ionic conductivity and flexibility after 2000 h in 1 M KOH solution at 100 °C . At the same time, the durability and performance of the membrane can also be further improved by introducing a flexible spacer, arrangement of various cations, , cross-linking, − branching, and other methods. Gao et al synthesized a series of novel cross-linked AEMs, which combine a hydrophobic fluorine-based skeleton with a hydrophilic long flexible polycationic side chain, and showed good chemical stability when immersed in 10 M KOH for 1000 h at 80 °C …”

Section: Introductionmentioning

confidence: 95%

High Conductive Anion Exchange Membranes from All-Carbon Twisted Intrinsic Microporous Polymers

et al. 2022

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This study obtained solution-tractable anion-selective membranes with intrinsic porous and highly ionic conductive capabilities by a convenient route. We used the coplanar structure of 9,9-dimethylxanthene to construct a rigid twisted intrinsic microporous all-carbon skeleton PDI with up to 363.4 m 2 g −1 of Brunauer−Emmett−Teller surface, and the pore was filled with a quaternary ammonium salt containing long flexible alkyl chains, which produced an efficient means of OH − transport. The conductivity of the resulting polymer (QPDI-100) is reached as high as 205 mS cm −1 at 80 °C. The size stability was determined to be good at high conductance and swelling ratio is less than 15% at 80 °C. QPDI-a exhibited good stability under alkaline conditions, and 90% of the conductivity of QPDI-100 was retained after being immersed in 1 M NaOH solution at 60 °C for 40 days. The power density of H 2 −O 2 fuel cells at 60 °C was 437.7 mW cm −2 . The prepared intrinsic porous anion exchange membranes (AEMs) demonstrate potential for the development of anion exchange membrane fuel cells. This membrane design strategy paves the way for a new generation of AEMs for the purposes of electrochemical energy conversion and storage.

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“…11 Yan and co-workers reported several types of poly(aryl piperidinium)-based APEs with an outstanding conductivity of 193 mS cm −1 at 95 °C and alkaline stability. 18 Recently, our group developed a series of poly(aryl-coterphenyl piperidinium) copolymers that exhibited promising conductivity greater than 150 mS cm −1 at 80 °C and durable alkaline stability at 1, 5, and 10 M NaOH solutions for longer than 1000 h. 16,[19][20][21] Although the state-of-the-art APEs have advanced in parallel to commercial proton exchange membranes (PEMs), it is rare that the reported AEMFCs simultaneously possess a power density greater than 1.5 W cm −2 and excellent in situ durability. [22][23][24] Water (the reactant and product of electrode reactions) greatly affects the performance and longevity of AEMFCs.…”

Section: Introductionmentioning

confidence: 99%

Effects of hydrophobic side chains in poly(fluorenyl-co-aryl piperidinium) ionomers for durable anion exchange membrane fuel cells

Park

Kang

et al. 2023

J. Mater. Chem. A

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Di-piperidinium-crosslinked poly(fluorenyl-co-terphenyl piperidinium)s for high-performance alkaline exchange membrane fuel cells

Abstract: Modern anion exchange membrane (AEM) fuel cells (AEMFCs) call for highly conductive, durable, and mechanically tough AEMs and ionomers. Here, we report a series of scalable di-piperidinium-crosslinked poly(fluorenyl-co-terphenyl piperidinium) (x-PFTP-DP-Cn)...

Cited by 60 publications

References 37 publications

SEBS-Based Anion Exchange Membrane Grafted with N-Spirocyclic Quaternary Ammonium Cations for Fuel Cells

SEBS-Based Anion Exchange Membrane Grafted with N-Spirocyclic Quaternary Ammonium Cations for Fuel Cells

High Conductive Anion Exchange Membranes from All-Carbon Twisted Intrinsic Microporous Polymers

Effects of hydrophobic side chains in poly(fluorenyl-co-aryl piperidinium) ionomers for durable anion exchange membrane fuel cells

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