Simulation study of the effects of phase separation on hydroxide solvation and transport in anion exchange membranes

2020 ◽  
Vol 152 (9) ◽  
pp. 094903
Author(s):  
Chen Chen ◽  
Christopher Arntsen ◽  
Ying-Lung Steve Tse
Keyword(s):  
Phase Separation ◽  
Anion Exchange ◽  
Simulation Study ◽  
Anion Exchange Membranes

scholarly journals A Novel Anion Exchange Membrane for Bisulfite Anion Separation by Grafting a Quaternized Moiety through BPPO via Thermal-Induced Phase Separation

2020 ◽  
Vol 21 (16) ◽  
pp. 5782
Author(s):  
Md Mofasserul Alam ◽  
Yaoming Wang ◽  
Chenxiao Jiang ◽  
Tingting Xu ◽  
Yahua Liu ◽  
...  
Keyword(s):  
Phase Separation ◽  
Anion Exchange ◽  
Membrane Surface ◽  
Separation Performance ◽  
Anion Exchange Membranes ◽  
Transmission Electron ◽  
Alkali Medium ◽  
Core Elements ◽  
Anion Separation ◽  
Exchange Membrane

Ion-exchange membranes are the core elements for an electrodialysis (ED) separation process. Phase inversion is an effective method, particularly for commercial membrane production. It introduces two different mechanisms, i.e., thermal induced phase separation (TIPS) and diffusion induced phase separation (DIPS). In this study, anion exchange membranes (AEMs) were prepared by grafting a quaternized moiety (QM,2-[dimethylaminomethyl]naphthalen-1-ol) through brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO) via the TIPS method. Those membranes were applied for selective bisulfite (HSO3−) anion separation using ED. The membrane surface morphology was characterized by SEM, and the compositions were magnified using a high-resolution transmission electron microscope (HRTEM). Notably, the membranes showed excellent substance stability in an alkali medium and in grafting tests performed in a QM-soluble solvent. The ED experiment indicated that the as-prepared membrane exhibited better HSO3− separation performance than the state-of-the-art commercial Neosepta AMX (ASTOM, Japan) membrane.

scholarly journals Imidazolium-functionalized anion exchange membranes using poly(ether sulfone)s as macrocrosslinkers for fuel cells

RSC Advances ◽  
2017 ◽  
Vol 7 (44) ◽  
pp. 27342-27353 ◽  
Author(s):  
Xiao Ling Huang ◽  
Chen Xiao Lin ◽  
En Ning Hu ◽  
Faizal Soyekwo ◽  
Qiu Gen Zhang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Phase Separation ◽  
Single Cell ◽  
Anion Exchange ◽  
Cell Performance ◽  
Anion Exchange Membranes ◽  
Imidazolium Cations

The incompatibility of the hydrophilic imidazolium cations from the functionalized poly(vinyl imidazole) with the long hydrophobic poly(ether sulfone) chain promoted the phase separation. The PES/PVIIL-0.4 membrane displayed good single cell performance.

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.

Hydroxide transport and chemical degradation in anion exchange membranes: a combined reactive and non-reactive molecular simulation study

2019 ◽  
Vol 7 (10) ◽  
pp. 5442-5452 ◽  
Author(s):  
Weiwei Zhang ◽  
Dengpan Dong ◽  
Dmitry Bedrov ◽  
Adri C. T. van Duin
Keyword(s):  
Fuel Cells ◽  
Charge Transport ◽  
Anion Exchange ◽  
Molecular Simulation ◽  
Simulation Study ◽  
High Performance ◽  
Chemical Degradation ◽  
Anion Exchange Membranes ◽  
Membrane Degradation ◽  
Dynamical Properties

Investigating the structural and dynamical properties, charge transport and membrane degradation in anion exchange membranes (AEMs) using atomistic-scale simulations provides a guideline for the design of new high-performance membrane fuel cells.

scholarly journals Improved Physicochemical Stability and High Ion Transportation of Poly(Arylene Ether Sulfone) Blocks Containing a Fluorinated Hydrophobic Part for Anion Exchange Membrane Applications

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1400 ◽  
Author(s):  
Ji Chu ◽  
Kyu Lee ◽  
Ae Kim ◽  
Dong Yoo
Keyword(s):  
Phase Separation ◽  
Anion Exchange ◽  
Physical Stability ◽  
Exchange Capacity ◽  
Open Circuit ◽  
Anion Exchange Membranes ◽  
Arylene Ether ◽  
Atomic Force ◽  
Physicochemical Stability ◽  
Exchange Membrane

A series of anion exchange membranes composed of partially fluorinated poly(arylene ether sulfone)s (PAESs) multiblock copolymers bearing quaternary ammonium groups were synthesized with controlled lengths of the hydrophilic precursor and hydrophobic oligomer via direct polycondensation. The chloromethylation and quaternization proceeded well by optimizing the reaction conditions to improve hydroxide conductivity and physical stability, and the fabricated membranes were very flexible and transparent. Atomic force microscope images of quaternized PAES (QN-PAES) membranes showed excellent hydrophilic/hydrophobic phase separation and distinct ion transition channels. An extended architecture of phase separation was observed by increasing the hydrophilic oligomer length, which resulted in significant improvements in the water uptake, ion exchange capacity, and hydroxide conductivity. Furthermore, the open circuit voltage (OCV) of QN-PAES X10Y23 and X10Y13 was found to be above 0.9 V, and the maximum power density of QN-PAES X10Y13 was 131.7 mW cm−2 at 60 °C under 100% RH.

Facile synthesis and the properties of novel cardo poly(arylene ether sulfone)s with pendent cycloaminium side chains as anion exchange membranes

2017 ◽  
Vol 8 (29) ◽  
pp. 4207-4219 ◽  
Author(s):  
Feixiang Gong ◽  
Ruiqiang Wang ◽  
Xinbing Chen ◽  
Pei Chen ◽  
Zhongwei An ◽  
...  
Keyword(s):  
Phase Separation ◽  
Anion Exchange ◽  
Side Chains ◽  
Anion Exchange Membranes ◽  
Facile Synthesis ◽  
Arylene Ether

The structure of pendent cycloaminium side chains containing higher alkalinity of conductive groups was effective for improving the micro-phase separation of AEMs.

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