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Article
Chemistry, Physical
Jia Jun Wang et al.
Summary: In this study, branched poly(aryl piperidinium) (PAP) anion exchange membranes (AEMs) with higher OH- conductivity and alkaline resistance were synthesized by acid-catalyzed reaction. The use of a flexible multi-cation crosslinker further improved the alkaline stability and OH- conductivity of the AEMs. The branched poly(p-terphenyl triphenylmethane 1-methyl piperidine) membrane crosslinked by multi-cation (PTTPQ4-40) showed excellent OH- conductivity and maintained its properties after prolonged exposure to alkaline conditions. The crosslinked PTTPQ4-40 AEM also exhibited a significantly higher peak power density (PPD) compared to the main-chain AEM, indicating its promising application prospects in fuel cells.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Chemical
Lei Liu et al.
Summary: A strategy for improving the alkaline stability and conductivity of anion exchange membranes (AEMs) is proposed by replacing N-alkyl side chains with hydrophilic and flexible N-oligo(ethylene glycol) (OEG) terminal pendants in comb-shaped poly(terphenyl piperidinium) (PTP) AEMs. The modified membranes show improved ex-situ alkaline stability, excellent mechanical properties, and high conductivity. This side-chain structural engineering approach opens up a new avenue for advanced water electrolysis.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Physical
Chenxiao Lin et al.
Summary: In this study, AEMs with clustered ionic groups and ether-bond-free backbone were designed and found to exhibit higher conductivity and lower swelling ratio, showing promising performance in fuel cells.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Chemical
Ho Hyun Wang et al.
Summary: This study reports the fabrication of high-performance AEMs reinforced with polyethylene using ethanol as a co-solvent. The addition of ethanol improves the penetration efficiency of polymer solutions in the substrate, resulting in AEMs with high transmittance and outstanding tensile strength. The peak power densities of the AEMFCs based on these membranes also demonstrate excellent performance.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Hae Min Kim et al.
Summary: This study reports the use of side-chain-type s-PDTP copolymers as ionomers and membranes for anion exchange membrane fuel cells (AEMFCs). These copolymers exhibit high alkaline stability, excellent micromorphology, and high OH- conductivity. The ionomers with moderate ion-exchange-capacity and rational water uptake show optimal AEMFC performance.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Chuan Hu et al.
Summary: High-performance poly(aryl-co-aryl piperidinium) reinforced membranes with excellent mechanical and chemical durability, gas tightness, and dimensional stability were reported for alkaline energy device applications.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Quan Chen et al.
Summary: Ion-conductive polymers with well-defined phase-separated structure have the potential application of separating mono- and bivalent ions. In this study, three anion exchange membranes based on side-chain-type poly(arylene ether sulfone) with different backbone stiffness were fabricated to investigate their separation performance of Cl-/NO3- and Cl-/SO42- ions. The results showed that the membrane with a rigid benzimidazole structure in the backbone had smaller ion channels and exhibited superior performance in separating Cl-/SO42- ions. However, it failed to separate Cl-/NO3- ions, possibly due to the similar ion size. The higher rotational energy barrier and smaller polymer matrix free-volume contributed to the construction of smaller ion channels.
Article
Engineering, Chemical
Chuan Hu et al.
Summary: Poly(aryl-co-aryl piperidinium) (c-PAP) has attracted attention in anion exchange membrane fuel cells. In this study, poly(aryl-co-terphenyl piperidinium)-x (PDnTP-x) AEMs with different alkyl spacers were investigated. Long alkyl chains improved dimensional stability and gas tightness, while short-chain-type membranes exhibited higher ion conductivity. All membranes showed excellent alkaline and oxidative stability. Short-chain-type PD0TP-x based AEMFC achieved a new-record power density and stable operation.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Wei Yuan et al.
Summary: Anion exchange membrane fuel cells (AEMFCs) have the advantage of low cost, but the use and commercialization of anion exchange membranes (AEMs) have always been challenging. This study successfully prepared AEMs and ionomers with non-rotatable rigid carbazole group and piperidinium group, and demonstrated their excellent performance in conductivity, mechanical strength, and stability. Moreover, the fuel cell based on these materials showed outstanding peak power density and long-term stability.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Wei Wei Gou et al.
Summary: Reasonable molecular structure design is particularly important for preparing anion exchange membranes (AEMs) with excellent alkaline resistance, competitive conductivity, and low swelling ratio (SR). In this study, ether-free fluoropolymers were synthesized via a superacid catalyzed reaction and long flexible multipiperidine cation side chains were grafted to different positions of the backbone. The position of the grafted ionic liquid affected the microphase separation structure and ion cluster size in the AEMs.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Huanhuan Chen et al.
Summary: Fuel cell technology is a clean energy generation method that enables carbon neutrality. This Perspective highlights recent trends in the fabrication of high-performance anion exchange membranes (AEMs) and identifies future directions. The success in polymer design is expected to lead to the development of long-lasting fuel cells, reducing carbon emissions and facilitating sustainable development.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Qiao Liu et al.
Summary: In this study, a series of novel poly(biphenyl piperidinium) membranes with superior conductivity and stability were successfully synthesized by tethering cationic groups to the backbone utilizing flexible hydrophobic alkyl spacers with various lengths. The long-term alkali resistance of AEMs can be improved by extending the length of the flexible alkyl chains appropriately. These membranes exhibited excellent film-forming ability and tensile strength, well-defined microphase separation, and achieved high power density and low voltage decay rate in fuel cell applications.
JOURNAL OF POWER SOURCES
(2022)
Article
Engineering, Chemical
Wei Ting Gao et al.
Summary: Introducing bulky twisted binaphthyl units into the backbones of anion exchange membranes enhances both conductivity and stability, leading to well-defined microphase separation and well-developed ion-conductive highways. The performance of poly(binaphthyl piperidinium)-based AEMs demonstrates significantly higher OH- conductivity and excellent retention in harsh alkaline environments compared to traditional AEMs.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Kyungwhan Min et al.
Summary: In this study, new high-performance anion exchange membrane (AEM) materials based on crosslinked polymers were developed, exhibiting excellent chemical stability, mechanical properties, and ion conductivity. The membranes demonstrated high water uptake, hydration ability, and dimensional stability, as well as exceptional alkaline stability.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Zhi Hong Cai et al.
Summary: In recent years, the continuous application of superacid-catalyzed condensation reactions has led to the development of anion exchange membranes (AEMs) with excellent performance. One widely discussed method is the copolymerization of two aromatic compounds with piperidone via a superacid-catalyzed reaction to synthesize anionic conducting copolymers. Among them, the poly(N-alkylcarbazole-co-terphenyl N,N '-dimethylpiperidinium) (PCTP-n) membranes exhibit high dimensional stability, alkaline resistance, mechanical robustness, and OH- conductivity.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Engineering, Chemical
Li Xu et al.
Summary: Ether-free poly(aryl piperidinium) polymers have been considered as promising materials for developing anion exchange membranes (AEMs) due to their alkaline stability and easy synthesis. However, the limitations of its main chain structure hinder its performance improvement. This study introduces hydrophilic and hydrophobic side chains into the polymer backbone to promote the aggregation of ionic clusters and the formation of microphase-separated structures. The resulting membrane exhibits outstanding conductivity and dimensional stability.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Physical
Dong Pan et al.
Summary: This study reports on the preparation and properties of poly(arylene alkylene piperidinium)s (PAAPs) with significantly higher alkaline stability than current state-of-the-art poly(arylene piperidinium)s. By rational monomer design and synthesis, the resulting polymers showed improved OH- conductivity and resistance against OH- attack, making them potential candidates for durable anion exchange membranes (AEMs) in energy conversion devices such as alkaline membrane fuel cells and water electrolyzers.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Nanjun Chen et al.
Summary: The study introduces aliphatic chain-containing PDTP copolymers to enhance the performance of AEMFCs. By reducing phenyl content in AEIs and improving mechanical properties in AEMs, PDTP materials exhibit excellent performance indicators such as mechanical properties, fuel barrier properties, ion conductivity, and stability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Engineering, Chemical
Lingling Ma et al.
Summary: Introducing octopus-like side chains in alkaline anion exchange membranes enhances conductivity and stability, leading to higher ion conductivity and durability. The use of these side chains in AEMs demonstrates improved performance in hydrogen/oxygen fuel cells.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Nanjun Chen et al.
Summary: The in-situ styrene-crosslinked c-PAP (x-PAP-PS) membranes exhibit high ion conductivity, mechanical strength, and durability, maintaining stability under harsh conditions. These membranes show improved water retention capacity at low relative humidity and achieve high power densities in AEMFCs.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Physical
Xinming Du et al.
Summary: By introducing a new preparation method, poly(biphenyl piperidine)s AEMs with micro-phase separation structures have been successfully constructed, improving alkaline stability while maintaining high ionic conductivity. The long-term performance under alkaline conditions is also excellent.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Chuan Long et al.
Summary: Ether-free polyaryl polymers prepared by superacid-catalyzed FriedelCrafts polymerization have attracted research interest for anion exchange membranes due to their high alkali resistance and simple synthesis methods. Further investigation is needed to explore the selection of monomers for high-performance polymer backbone and the relationship between polymer structure construction and properties.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Multidisciplinary Sciences
Nanjun Chen et al.
Summary: The study presents a series of durable poly(fluorenyl aryl piperidinium) ionomers and membranes with high OH- conductivity and excellent mechanical properties for improved performance of alkaline fuel cells. Innovative design of poly(fluorenyl aryl piperidinium) copolymers is explored to extend their applications in anion exchange membrane fuel cells.
NATURE COMMUNICATIONS
(2021)
Review
Materials Science, Multidisciplinary
Zhengwang Tao et al.
Summary: Solid alkaline fuel cells with anion exchange membranes (AEMs) have been a focus in renewable energy cells due to their high electrode activity, potential for non-precious metal catalysts, and lower fuel purity requirements. The past decade has seen significant progress in AEM designs, with various cationic structures being explored, though challenges remain in improving hydroxide conductivity and durability. Future research directions include addressing these challenges.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Engineering, Chemical
Andrit Allushi et al.
Summary: This study focused on developing anion exchange membranes (AEMs) with high alkaline stability and hydroxide conductivity by functionalizing fluorene units with dual pairs of quaternary piperidinium cations. The AEMs with bisPip side chains demonstrated superior conductivity and alkaline stability compared to AEMs with monoPip cations per fluorene unit, highlighting the advantage of locally concentrating the cations in the polymer structure.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Physical
Yake Yang et al.
Summary: This study demonstrates the excellent alkaline and oxidative stabilities of poly (quinquephenylene-co-diphenylene piperidinium) (PQDP) AEMs with mechanical robustness and high ion conductivities. The PQDP membranes show high anion conductivity and stability, with a fuel cell prototype using PQDP-3 exhibiting a high peak power density.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Multidisciplinary
Wei You et al.
Summary: A novel method for preparing high-performance AAEMs through photocatalytic hydroamination reaction is reported in this study, addressing the challenges of complex synthesis of functionalized cyclooctene monomers, while also considering the importance of local backbone morphology in the rational design of stable high-performance AAEMs.
Review
Polymer Science
Wei You et al.
PROGRESS IN POLYMER SCIENCE
(2020)
Article
Chemistry, Physical
Yabin Jia et al.
Article
Biochemistry & Molecular Biology
T. S. Mayadevi et al.
Article
Polymer Science
Hongsa Han et al.
EUROPEAN POLYMER JOURNAL
(2019)
Article
Multidisciplinary Sciences
Wei You et al.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2019)
Article
Energy & Fuels
Junhua Wang et al.
Article
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Yoonseob Kim et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Chemistry, Multidisciplinary
Tianyu Zhu et al.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2018)
Article
Polymer Science
Wei You et al.
Article
Chemistry, Multidisciplinary
Joel S. Olsson et al.
ADVANCED FUNCTIONAL MATERIALS
(2018)
Article
Polymer Science
Nanjun Chen et al.
Article
Multidisciplinary Sciences
Andrew J. Musacchio et al.
Article
Polymer Science
C. Tyler Womble et al.
Article
Chemistry, Multidisciplinary
Kristina M. Hugar et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2015)
Article
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M. G. Marino et al.
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Polymer Science
Andrew G. Wright et al.
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Kevin J. T. Noonan et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2012)
Article
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Nicholas J. Robertson et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2010)
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Henry A. Kostalik et al.
