Alkaline stable pyrrolidinium-type main-chain polymer: The synergetic effect between adjacent cations

Tan, Xiaochen; Sun, Zhe; Pan, Ji Sheng; Zhao, Junliang; Cao, Huixing; Zhu, Hairong; Yan, Feng

doi:10.1016/j.memsci.2020.118689

Cited by 24 publications

(13 citation statements)

References 49 publications

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“…The main approach for enhancing the alkaline stability that has been studied is the individual cation approach with almost no focus on the synergetic effects between adjacent cations, in spite its effects on alkaline stability. 80 Therefore, the listed AEMs are mainly single cation type but studies have investigated multiple cation AEMs as well. It is believed that designing multi-cation side-chain type polymer AEMs is a good approach to obtain improved ion conductivity and enhance alkaline stability.…”

Section: Anion Exchange Membranes (Aems)mentioning

confidence: 99%

“…It has also been demonstrated that AEMs with multication side chains improve the conductivity due to large ionic clusters and microphase separation. 80 Also, the length of alkyl spacer (on the side chain) may inuence ion conductivity and alkaline stability of the AEM. 81 It has been reported that graing multiple cations on the polymer backbone can form hydrophilic/hydrophobic micro-phase separation and decrease the functional degree of the copolymer, which can restrain the degradation of the polymer backbone.…”

Section: Anion Exchange Membranes (Aems)mentioning

confidence: 99%

“…However, such membranes have shown an inferior alkaline durability in comparison to AEMs with a low number of quaternary ammonium on the side chains. 84 Several studies on cation backbone type AEMs have also been performed, including a study by Tan et al 80 which have investigated main-chain polymers with pyrrolidinium cations tethered with different methylene groups. They conducted that increasing cation charge density of the pyrrolidinium compounds provided better alkaline stability, but a long spacer between the pyrrolidinium cations accelerated cations degradation in alkaline solutions.…”

Section: Anion Exchange Membranes (Aems)mentioning

confidence: 99%

See 2 more Smart Citations

Alkaline membrane fuel cells: anion exchange membranes and fuels

Hren

Božič²,

Fakin

et al. 2021

Sustainable Energy Fuels

194

103

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Section: Anion Exchange Membranes (Aems)mentioning

confidence: 99%

Section: Anion Exchange Membranes (Aems)mentioning

confidence: 99%

Section: Anion Exchange Membranes (Aems)mentioning

confidence: 99%

See 1 more Smart Citation

Alkaline membrane fuel cells: anion exchange membranes and fuels

Hren

Božič²,

Fakin

et al. 2021

Sustainable Energy Fuels

194

103

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show abstract

“…[ 37,38 ] Due to the weak alkaline stability of QA cations under high temperature and strong alkaline conditions, the design and development of functional cations with higher stability has become an important research topic in the preparation of high‐performance AEMs. In recent years, a series of different cationic functional groups, including cyclic or spirocyclic QA, [ 39–45 ] imidazolium, [ 46–52 ] guanidinium, [ 53–55 ] pyridinium, [ 56 ] and quaternary phosphonium (QP) [ 57–61 ] are further modified and introduced into the structure of AEMs. Compared with the previously reported AEMs based on QA salts, these AEMs with modified cation groups display significantly improved properties, especially for their alkaline stability.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6] the preparation of high-performance AEMs. In recent years, a series of different cationic functional groups, including cyclic or spirocyclic QA, [39][40][41][42][43][44][45] imidazolium, [46][47][48][49][50][51][52] guanidinium, [53][54][55] pyridinium, [56] and quaternary phosphonium (QP) [57][58][59][60][61] are further modified and introduced into the structure of AEMs. Compared with the previously reported AEMs based on QA salts, these AEMs with modified cation groups display significantly improved properties, especially for their alkaline stability.…”

Section: Introductionmentioning

confidence: 99%

Progress in High‐Performance Anion Exchange Membranes Based on the Design of Stable Cations for Alkaline Fuel Cells

Tao

Wang

Zhao

et al. 2021

Adv Materials Technologies

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Solid alkaline fuel cells with anion exchange membranes (AEMs) have drawn wide attention and have become an important focus in the field of renewable energy cells in recent years due to their high electrode activity, potential application of non‐precious metal catalysts, and relatively low requirements for fuel purity. AEM is the central component in solid alkaline fuel cells, and plays the role of conducting ions, blocking fuel crossover and providing catalyst support in fuel cells. Its performance directly affects the efficiency and service life of fuel cells. With some exceptions, the majority of AEMs have relatively low hydroxide conductivity and poor durability, which cannot meet the requirements of practical applications. The past decade has witnessed great progress in AEM designs and stability. Various kinds of AEMs with different cationic structures have been designed, and their properties and application in fuel cells are investigated. This review provides a comparative investigation and summary of highlights from the design of cationic structures for AEMs, including cyclic and spirocyclic quaternary ammonium cations, modified quaternary phosphonium, modified imidazoles, guanidinium, and metal cations. The authors’ perspective on the remaining challenges and directions of AEMs research for future development are also discussed.

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Machine Learning‐Aided Design of Highly Conductive Anion Exchange Membranes for Fuel Cells and Water Electrolyzers

Zhang,

Yuan,

Zhang

et al. 2024

Advanced Materials

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Alkaline anion exchange membrane (AEM)‐based fuel cells (AEMFCs) and water electrolyzers (AEMWEs) are vital for enabling the efficient and large‐scale utilization of hydrogen energy. However, the performance of such energy devices is impeded by the relatively low conductivity of AEMs. The conventional trial‐and‐error approach to designing membrane structures has proven to be both inefficient and costly. To address this challenge, a fully connected neural network (FCNN) model is developed based on acid‐catalyzed AEMs to analyze the relationship between structure and conductivity among 180,000 AEM variations. Under machine learning guidance, anilinium cation‐type membranes are designed and synthesized. Molecular dynamics simulations and Mulliken charge population analysis validated that the presence of a large anilinium cation domain is a result of the inductive effect of N+ and benzene rings. The interconnected anilinium cation domains facilitated the formation of a continuous ion transport channel within the AEMs. Additionally, the incorporation of the benzyl electron‐withdrawing group heightened the inductive effect, leading to high conductivity AEM variant as screened by the machine learning model. Furthermore, based on the highly active and low‐cost monomers given by machine learning, the large‐scale synthesis of anilinium‐based AEMs confirms the potential for commercial applications.

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Alkaline stable pyrrolidinium-type main-chain polymer: The synergetic effect between adjacent cations

Cited by 24 publications

References 49 publications

Alkaline membrane fuel cells: anion exchange membranes and fuels

Alkaline membrane fuel cells: anion exchange membranes and fuels

Progress in High‐Performance Anion Exchange Membranes Based on the Design of Stable Cations for Alkaline Fuel Cells

Machine Learning‐Aided Design of Highly Conductive Anion Exchange Membranes for Fuel Cells and Water Electrolyzers

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