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Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...

Ion-Exchange Chromatography

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...

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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...

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Updated: Jan 17, 2026

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device

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Published on: July 20, 2021

Screening Anion Exchange Membranes for CO₂ Electrolysis.

Yuxuan Zhao¹, Hang Hua¹, Shilei Wei¹

¹Institute of Photoelectronic Thin Film Devices and Technology, State Key Laboratory of Photovoltaic Materials and Cells, Tianjin Key Laboratory of Efficient Utilization of Solar Energy, Ministry of Education Engineering Research Center of Thin Film Photoelectronic Technology, Nankai University, Tianjin 300350, China.

ACS Applied Materials & Interfaces

|September 23, 2025

Summary

This study compared commercial anion exchange membranes (AEMs) for CO2 electrolysis. Fumasep membranes offer the best energy efficiency, while Piperion and Sustainion membranes provide superior stability for CO2 reduction reactions.

Keywords:

anion exchange membrane electrochemical CO2 reduction electrolyzer energy efficiency membrane electrode assembly selectivity stability

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Published on: February 23, 2017

Area of Science:

Electrochemistry
Materials Science
Chemical Engineering

Background:

Anion exchange membranes (AEMs) are crucial components in membrane electrode assembly (MEA) electrolyzers for the electrochemical carbon dioxide reduction reaction (CO2RR).
AEMs significantly influence mass transfer, energy efficiency, and operational stability in CO2RR systems.
Selecting the optimal AEM is vital for advancing efficient CO2 utilization technologies.

Purpose of the Study:

To compare the performance of commercially available AEMs from Piperion, Sustainion, and Fumasep in CO2RR applications.
To identify key AEM characteristics that impact energy efficiency, product selectivity (Faradaic efficiency), and long-term device stability.
To provide insights into AEM selection criteria for optimizing CO2 electrolysis.

Main Methods:

Comparative analysis of three commercial AEM brands: Piperion, Sustainion, and Fumasep.
Evaluation of AEM performance based on energy efficiency, Faradaic efficiency of CO2RR products, and operational stability.
Correlation of AEM properties, such as conductivity and cation barrier characteristics, with observed CO2RR performance.

Main Results:

Fumasep 3-50 exhibited the highest energy efficiency, likely due to the high conductivity of its constituent organic monomers.
Piperion A20 and Sustainion X-37 grade RT demonstrated superior Faradaic efficiency and cation barrier properties.
These properties in Piperion and Sustainion membranes enabled prolonged and stable CO2RR operation.

Conclusions:

Commercial AEMs vary significantly in their impact on CO2RR performance, affecting energy efficiency and stability.
Fumasep membranes excel in energy efficiency, while Piperion and Sustainion membranes offer advantages in selectivity and long-term operation.
This screening provides essential data for selecting appropriate AEMs to enhance electrochemical CO2 reduction technologies.