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Engineering Delocalized Polarizations in Metal Oxide Electrodes with Conducting Polymers for Efficient and Durable
Hyunji Oh1, Ji-Woo Park2,3, Jiyeoung Choi3
1Department of Mechanical Systems Engineering, Sookmyung Women's University, Seoul, 04310, Korea.
Chemsuschem
|November 21, 2024
Summary
This study developed durable electrodes for oxygen evolution using polypyrrole-coated perovskite oxides. These novel electrodes maintain high activity in corrosive conditions, crucial for efficient water electrolysis.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- The oxygen evolution reaction (OER) is critical for electrolysis but hindered by slow kinetics and electrode instability in corrosive environments.
- Achieving stable OER at high current densities is challenging due to material degradation under oxidative conditions.
Purpose of the Study:
- To develop highly durable electrodes for the oxygen evolution reaction using perovskite oxides coated with conducting polymers.
- To investigate the protective mechanism of polypyrrole coating against electrode corrosion during OER.
Main Methods:
- Electrodeposition of polypyrrole (pPy) onto Pr0.7Sr0.3CoO3 perovskite oxide.
- Electrochemical testing, including accelerated durability tests at high current densities.
- High-resolution transmission electron microscopy (HRTEM) for structural analysis.
Main Results:
- The polypyrrole-electrodeposited Pr0.7Sr0.3CoO3 electrodes maintained over 99% of their initial activity after durability tests, unlike bare oxides (<6% activity).
- HRTEM confirmed the preservation of high crystallinity in the heterostructure, indicating pPy clusters protect the electrode.
- The heterostructure demonstrated exceptional stability for over 700 hours at 100 mA cm-2 in overall water electrolysis.
Conclusions:
- Conducting polymer coating, specifically polypyrrole, effectively protects perovskite oxide electrodes from corrosion during oxygen evolution.
- This delocalized polarization strategy offers a promising pathway for developing stable and efficient electrodes for scalable water electrolysis.
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