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Updated: Jan 18, 2026
07:32
Dynamic Electrochemical Measurement of Chloride Ions
Published on: February 5, 2016
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Controlling Chloride Crossover in Bipolar Membrane Water Electrolysis
Maria F Rochow1, Daniela H Marin2,3, Harrison J Cassady4
1Department of Material Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
ACS Electrochemistry
|September 10, 2025
Summary
Bipolar membranes (BPMs) enhance water electrolysis. An E98-05 (CEL)/FAS-50 (AEL) membrane with a TiO2 catalyst showed best performance and lowest chlorine crossover in asymmetric feeds.
Area of Science:
- Electrochemistry
- Materials Science
- Chemical Engineering
Background:
- Bipolar membranes (BPMs), composed of anion exchange (AEL) and cation exchange layers (CEL), are promising for water electrolysis.
- Their layered structure enables unique performance characteristics.
Purpose of the Study:
- Investigate four BPMs for water electrolysis performance.
- Evaluate performance under symmetric and asymmetric feed conditions.
- Analyze chlorine species crossover in asymmetric feeds.
Main Methods:
- Tested four different BPMs in a water electrolysis cell.
- Employed symmetric (deionized water) and asymmetric (0.5 mol/L NaCl catholyte, deionized water anolyte) feeds.
- Measured total chlorine species crossover at 250 mA/cm².
Main Results:
- The E98-05 (CEL)/FAS-50 (AEL) membrane with a TiO2 catalyst performed best under asymmetric conditions.
- This membrane exhibited the lowest chlorine species crossover and cell voltage.
- Cation exchange layer (CEL) orientation influenced chlorine crossover via Donnan exclusion.
Conclusions:
- BPM selection and orientation are critical for water electrolysis efficiency, especially with asymmetric feeds.
- The CEL plays a key role in mitigating anion crossover.
- TiO2 catalyst enhances BPM performance in water electrolysis.
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