Anion Exchange Membranes,Thickness:95𝜇m

Catalog Number	ACMA00033536
Color Form	Off-White/Beige
Feature	Low resistance
Ionic Form	Cl-
Moisture Content	35%-43%
Notice For Use	·Soak in 5% NaCl solution for 24 hours for pretreatment ·Use under humid conditions to avoid dryness ·Avoid excessive bending, folding and close to sharp objects ·Store in 1-49% sodium chloride solution and avoid light ·Avoid use in solutions containing oils, oxidizing substances (concentrated nitric acid, perchloric acid, etc.) and ionic high molecular weight organic compounds (surfactants, etc.)
pH Range	1.0-14
Rupture Strength	1.5Mpa
Selectivity	90%
Sheet Resistance	1.1(0.5mol/L NaCl)𝛺·cm2
Size	1600×2800mm, 1800×5500mm, 5500×11200mm, 11200×11200mm
Specification	Single Sheet
Thermal Stability	5°C-120°C
Thickness	95𝜇m
Type	Anion

Frontier Research

Design and Synthesis of Anion Exchange Membranes for Fuel Cells

Hren M, et al. Sustainable Energy & Fuels, 2021, 5(3), 604-637.

In anion exchange membrane fuel cells (AEMFCs), anion exchange membranes (AEMs) are the core. The main function of alkaline AEMs is to transport OH- anions from cathode to anode while blocking electrons and fuel crossover under highly alkaline conditions.
Design and synthesis of AEMs
· The design and synthesis of AEMs for fuel cells involves creating a polymer with excellent OH conductivity, stability, strength, flexibility, low gas permeability, and cost-effectiveness.
· Typically, the structure of AEMs involves adding a hydrophobic side chain to the membrane, with a quaternary ammonium cation attached to the polymer backbone and OH- anions dissociated in the aqueous phase. The membrane conducts anions through interactions between positively charged functional groups and OH- anions.
· However, ionic transportation can be hindered by the hydrophobic walls surrounding the hydrated ions and water molecules, creating small ionic channels through the dynamic assembly of ionic clusters. By increasing the content of hydrophobic structures, ion clusters aggregate, resulting in larger ion clusters to promote the formation of interconnected ion channels.
· Different synthetic polymers such as polyphenylene oxide, poly(ether ether ketone), and polyvinyl alcohol have been proposed for AEMs processing using various methods like block polymerization, copolymerization, and direct solution casting. These materials are then functionalized to obtain a positively charged AEM.

Q&A

What are anion exchange membranes (AEMs) commonly used for?

AEMs can be used for fuel cells, redox flow batteries, electrolyzers, and water desalination membranes.

Why are AEMs considered attractive as an electrolyte layer?

AEMs are attractive due to their low cost and ease of manufacturing compared to PEM membranes.

What is the previous version of the AEMFC?

The previous version of the AEMFC is the AFC, which used a liquid alkaline electrolyte matrix and was used in NASA's space missions.

What are AEMs usually made of?

AEMs are usually composed of polymers that are covalently bonded to different types of cations, such as quaternary ammonium cations, sulfonium types, imidazoliums, phosphoniums, etc.

How does ion transport occur in an electrolyte?

Ion transport can occur through diffusion, convection, or migration driven by an electrical potential across the electrolyte.

What is Grotthus transport?

Grotthus transport is the migration of protons due to interconversion between tri-coordinated H3O+(H2O)3 and H5O2+ via hydrogen bond breaking and formation.

Why is the mobility of hydroxide lower than that of protons?

The currently accepted explanation for the lower mobility of hydroxide is that it is hyper-coordinated by 4.5 water molecules, while protons are hypocoordinated by only 3 water molecules.

What experimental techniques have been used to study ion transport mechanisms?

Neutron and X-ray scattering experiments have observed the hyper-coordinated OH- complex, while FTIR spectroscopy data supports the existence of a weak hydrogen bond between OH- and H2O.

What is generally agreed upon about hydroxide transport?

While the detailed mechanisms are not fully understood, it is generally agreed that water solvation plays a critical role in the efficient migration of the hydroxide anion.