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Electrode Separators for the Next-Generation Alkaline Water Electrolyzers
David Aili1, Mikkel Rykær Kraglund1, Sinu C Rajappan1
1Department of Energy Conversion and Storage, Technical University of Denmark, Elektrovej, Building 375, 2800 Lyngby, Denmark.
ACS Energy Letters
|April 24, 2023
Summary
Alkaline water electrolysis is key for green hydrogen production. New electrode separators are crucial for improving energy efficiency and operational flexibility in renewable energy systems.
Area of Science:
- Electrochemistry
- Materials Science
- Sustainable Energy
Background:
- Multi-gigawatt hydrogen production via water electrolysis is vital for the green transition, energy storage, and sustainable fuels/materials.
- Alkaline water electrolysis is a mature technology, favored for its scalability due to abundant raw materials.
- Renewable energy systems necessitate advancements in electrolysis for higher efficiency, rate capability, and dynamic operation.
Purpose of the Study:
- To review and compare the primary development pathways for advanced electrode separators in alkaline water electrolysis.
- To identify the advantages and disadvantages of current approaches for next-generation electrolyzer technology.
- To provide insights for rational development directions in alkaline water electrolysis.
Main Methods:
- Comparative analysis of three main development paths for electrode separators.
- Evaluation of separator performance concerning ohmic losses and gas crossover suppression.
- Assessment of suitability for high current densities and dynamic operating conditions.
Main Results:
- Different development paths offer distinct trade-offs between performance metrics like conductivity and gas separation.
- Key challenges include achieving low ohmic losses at high current densities while preventing gas crossover.
- The choice of separator technology significantly impacts overall system efficiency and operational flexibility.
Conclusions:
- Optimized electrode separators are essential for meeting the demands of modern renewable energy systems for alkaline water electrolysis.
- Further research should focus on balancing high performance with cost-effectiveness and long-term stability.
- Strategic development of electrode separators will accelerate the widespread adoption of green hydrogen production.
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