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Charge State Evolution in Electrocatalysts for Bridging the Activity-Stability Gap in Acidic Oxygen Evolution.
Jiahui Yang1, Liming Deng2, Yuping Wu1
1Confucius Energy Storage Lab, School of Energy and Environment & Z Energy Storage Center, Southeast University, Nanjing 211189, China.
Accounts of Chemical Research
|February 28, 2026
Summary
Dynamic charge regulation is key for stable, active acidic oxygen evolution catalysts in water electrolysis. Understanding and controlling charge states during operation balances performance and longevity for proton exchange membrane water electrolysis.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Acidic oxygen evolution reaction (OER) is crucial for hydrogen production via proton exchange membrane water electrolysis (PEMWE).
- Harsh conditions in PEMWE lead to catalyst degradation, limiting activity and stability.
- Current strategies often fail due to reliance on static properties, neglecting dynamic operational changes.
Purpose of the Study:
- To highlight the critical role of dynamic charge-state evolution in acidic OER.
- To provide strategies for regulating charge states to enhance catalyst activity and stability.
- To bridge the gap between static catalyst design and dynamic operational requirements in PEMWE.
Main Methods:
- Analysis of fundamental charge effects: tunability, directionality, and sustainability.
- Strategies for modulating dynamic charge behaviors: active-site, support, and surface engineering.
- Integration of in situ characterization, electrochemical analysis, and theoretical calculations.
Main Results:
- Charge effects significantly influence both activity and stability in acidic OER.
- Dynamic charge regulation across multiple scales can be achieved through targeted engineering.
- In situ techniques successfully probe charge evolution and correlate it with reaction mechanisms and stability.
Conclusions:
- Systematic understanding and regulation of dynamic charge-state evolution are essential for advanced PEMWE catalysts.
- Tailoring charge evolution offers a promising pathway for designing highly active and stable acidic OER catalysts.
- Future opportunities lie in in situ mechanism elucidation, cross-scale integration, and expanding material systems.
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