Highly alkaline stable N1-alkyl substituted 2-methylimidazolium functionalized alkaline anion exchange membranes

2015 ◽  
Vol 3 (16) ◽  
pp. 8559-8565 ◽  
Author(s):  
Congrong Yang ◽  
Suli Wang ◽  
Wenjia Ma ◽  
Luhua Jiang ◽  
Gongquan Sun
Keyword(s):  
Anion Exchange ◽  
Functional Groups ◽  
Functional Group ◽  
Anion Exchange Membranes

N1-butyl, hexyl or octyl-substituted 2-methylimidazolium functional groups are much more stable than the 1,2-dimethylimidazolium functional group.

scholarly journals Synthetic approaches for advanced multi-block anion exchange membranes

RSC Advances ◽  
2019 ◽  
Vol 9 (37) ◽  
pp. 21106-21115 ◽  
Author(s):  
Dongwon Shin ◽  
Adam F. Nugraha ◽  
Farid Wijaya ◽  
Sojeong Lee ◽  
Eunyoung Kim ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Anion Exchange ◽  
Functional Groups ◽  
Anion Exchange Membranes ◽  
Synthetic Approaches ◽  
Post Functionalization

Multi-block copolymers bearing ionic functional groups were synthesized through direct polymerization or post-functionalization.

A Study on the Effect of Different Functional Groups in Anion Exchange Membranes for Vanadium Redox Flow Batteries

2017 ◽  
Vol 27 (5) ◽  
pp. 415-424 ◽  
Author(s):  
Jae-Myeong Lee ◽  
◽  
Mi-Soon Lee ◽  
Ki-Seok Nahm ◽  
Jae-Deok Jeon ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Functional Groups ◽  
Anion Exchange Membranes ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

Adamantammonium as a novel functional group for anion exchange membranes with excellent comprehensive performances

Polymer ◽  
2017 ◽  
Vol 112 ◽  
pp. 288-296 ◽  
Author(s):  
Jinlei Wang ◽  
Ying Chen ◽  
Qi Wei ◽  
Shanzhong Yang ◽  
Huagao Fang ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Functional Group ◽  
Anion Exchange Membranes

scholarly journals Enhanced Hydroxide Conductivity and Dimensional Stability with Blended Membranes Containing Hyperbranched PAES/Linear PPO as Anion Exchange Membranes

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3011
Author(s):  
Sang Hee Kim ◽  
Kyu Ha Lee ◽  
Ji Young Chu ◽  
Ae Rhan Kim ◽  
Dong Jin Yoo
Keyword(s):  
Anion Exchange ◽  
Functional Group ◽  
Anion Exchange Membranes ◽  
Channel Formation ◽  
Arylene Ether ◽  
Phenylene Oxide ◽  
Afm Analysis ◽  
Very High ◽  
Excessive Water ◽  
Hyperbranched Structure

A series of novel blended anion exchange membranes (AEMs) were prepared with hyperbranched brominated poly(arylene ether sulfone) (Br-HB-PAES) and linear chloromethylated poly(phenylene oxide) (CM-PPO). The as-prepared blended membranes were fabricated with different weight ratios of Br-HB-PAES to CM-PPO, and the quaternization reaction for introducing the ionic functional group was performed by triethylamine. The Q-PAES/PPO-XY (quaternized-PAES/PPO-XY) blended membranes promoted the ion channel formation as the strong hydrogen bonds interconnecting the two polymers were maintained, and showed an improved hydroxide conductivity with excellent thermal behavior. In particular, the Q-PAES/PPO-55 membrane showed a very high hydroxide ion conductivity (90.9 mS cm−1) compared to the pristine Q-HB-PAES membrane (32.8 mS cm−1), a result supported by the morphology of the membrane as determined by the AFM analysis. In addition, the rigid hyperbranched structure showed a suppressed swelling ratio of 17.9–24.9% despite an excessive water uptake of 33.2–50.3% at 90 °C, and demonstrated a remarkable alkaline stability under 2.0 M KOH conditions over 1000 h.

The effect of polymer backbones and cation functional groups on properties of anion exchange membranes for fuel cells

2020 ◽  
Vol 603 ◽  
pp. 118025 ◽  
Author(s):  
Kuan Yang ◽  
Xiaomeng Chu ◽  
Xiaojuan Zhang ◽  
Xiaofeng Li ◽  
Jifu Zheng ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Anion Exchange ◽  
Functional Groups ◽  
Anion Exchange Membranes

scholarly journals Anion Exchange Membranes Obtained from Poly(arylene ether sulfone) Block Copolymers Comprising Hydrophilic and Hydrophobic Segments

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 325 ◽  
Author(s):  
Jun Ha Kim ◽  
Mohanraj Vinothkannan ◽  
Ae Rhan Kim ◽  
Dong Jin Yoo
Keyword(s):  
Phase Separation ◽  
Anion Exchange ◽  
Functional Groups ◽  
Mechanical Stability ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Degree Of Substitution ◽  
Anion Exchange Membranes ◽  
Arylene Ether ◽  
Physical And Chemical

The anion exchange membrane may have different physical and chemical properties, electrochemical performance and mechanical stability depending upon the monomer structure, hydrophilicity and hydrophobic repeating unit, surface form and degree of substitution of functional groups. In current work, poly(arylene ether sulfone) (PAES) block copolymer was created and used as the main chain. After controlling the amount of NBS, the degree of bromination (DB) was changed in Br-PAES. Following that, quaternized PAES (Q-PAES) was synthesized through quaternization. Q-PAES showed a tendency of enhancing water content, expansion rate, ion exchange capacity (IEC) as the degree of substitution of functional groups increased. However, it was confirmed that tensile strength and dimensional properties of membrane reduced while swelling degree was increased. In addition, phase separation of membrane was identified by atomic force microscope (AFM) image, while ionic conductivity is greatly affected by phase separation. The Q-PAES membrane demonstrated a reasonable power output of around 64 mW/cm2 while employed as electrolyte in fuel cell operation.

scholarly journals Poly(vinyl alcohol)-based Anion Exchange Membranes for Alkaline Polymer Electrolyte Fuel Cells

2021 ◽  
Vol 10 (3) ◽  
pp. 435-443
Author(s):  
Asep Muhamad Samsudin ◽  
Sigrid Wolf ◽  
Michaela Roschger ◽  
Viktor Hacker
Keyword(s):  
Fuel Cells ◽  
Anion Exchange ◽  
Water Uptake ◽  
Vinyl Alcohol ◽  
Functional Group ◽  
Exchange Capacity ◽  
Poly Vinyl Alcohol ◽  
Anion Exchange Membranes ◽  
Direct Ethanol Fuel Cells ◽  
Alkaline Polymer Electrolyte

Crosslinked anion exchange membranes (AEMs) made from poly(vinyl alcohol) (PVA) as a backbone polymer and different approaches to functional group introduction were prepared by means of solution casting with thermal and chemical crosslinking. Membrane characterization was performed by SEM, FTIR, and thermogravimetric analyses. The performance of AEMs was evaluated by water uptake, swelling degree, ion exchange capacity, OH- conductivity, and single cell tests. A combination of quaternized ammonium poly(vinyl alcohol) (QPVA) and poly(diallyldimethylammonium chloride) (PDDMAC) showed the highest conductivity, water uptake, and swelling among other functional group sources. The AEM with a combined mass ratio of QPVA and PDDMAC of 1:0.5 (QPV/PDD0.5) has the highest hydroxide conductivity of 54.46 mS cm-1. The single fuel cell tests with QPV/PDD0.5 membrane yield the maximum power density and current density of 8.6 mW cm-2 and 47.6 mA cm-2 at 57 °C. This study demonstrates that PVA-based AEMs have the potential for alkaline direct ethanol fuel cells (ADEFCs) application.

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