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Updated: May 12, 2025
07:55
Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
Published on: July 20, 2021
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Ionomer Interphase Layers Enable Efficient Anion-Exchange Membrane Water Electrolyzer Operation at Low pH
Arthur P L Thévenot1, Thilo Reiter1, Trung Ngo Thanh1
1Department of Chemistry, Chemical Engineering Department, Technical University Berlin, 10623 Berlin, Germany.
Energy & Fuels : an American Chemical Society Journal
|May 7, 2025
Summary
Developing anion-exchange membrane water electrolysis (AEMWE) for green hydrogen production requires operating under low alkalinity. This study found that ionomer top layer interphases significantly boost AEMWE cathode performance, even under pure water conditions.
Area of Science:
- Green hydrogen production
- Electrochemical energy conversion
- Anion-exchange membrane water electrolysis (AEMWE)
Background:
- AEMWE is a key green hydrogen technology, but current systems require highly alkaline conditions.
- Operating AEMWE under lower alkalinity, towards pure water, is a critical research priority for sustainability.
- The alkaline-exchange ionomer (AEI) plays a crucial role in ion transport within AEMWE cells under low-alkaline conditions.
Purpose of the Study:
- To investigate the impact of different AEI architectures on AEMWE cathode performance under low-alkaline conditions.
- To identify optimal AEI strategies for efficient ion transport at the cathode.
- To explore the mechanistic role of AEI architectures in enhancing AEMWE cell performance.
Main Methods:
- Utilized commercially available ionomers and membranes for AEMWE cathode fabrication.
- Systematically varied AEI architectures, including the implementation of ionomer top layer (ITL) interphases.
- Evaluated cell performance under varying pH conditions, focusing on low-alkaline and pure water feeds.
Main Results:
- Demonstrated that separate ionomer top layer (ITL) interphases between the cathode catalyst layer and membrane are highly effective.
- Achieved significant performance enhancements in AEMWE cathodes using ITLs under low pH conditions.
- Observed performance benefits from ITLs even at pH 14, suggesting a broader applicability.
Conclusions:
- ITL interphases act as an ion-transport buffer, facilitating ion migration from cathode to anode.
- The strategic design of AEI architectures, specifically ITLs, is crucial for high-performance AEMWE.
- These findings provide valuable insights for designing sustainable AEMWE systems for pure water electrolysis.
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