Electronically Conductive, Multifunctional Polymer Binder for Highly Active, Stable, and Abundant Composite...

Area of Science:

• Electrochemistry
• Materials Science
• Renewable Energy Storage

Background:

• Water electrolysis is a key technology for storing renewable energy by producing hydrogen and oxygen.
• Efficient electrodes are crucial for water electrolysis, requiring materials that facilitate proton, electron, and oxygen transfer.
• Current electrode materials often face limitations in activity, stability, or reliance on scarce catalysts.

Purpose of the Study:

• To develop a novel multifunctional polymer for electrodes in water electrolysis.
• To enhance the oxygen evolution reaction (OER) by creating a polymer that conducts electrons and ions and potentially coreacts with catalysts.
• To demonstrate a cost-effective and high-performance electrode solution using abundant materials.

Main Methods:

• Fabrication of electrodes using a two-step process from readily available reagents.
• Incorporation of a multifunctional polymer capable of electron and ion conduction.
• Testing electrode performance under harsh conditions (85 °C, 6 M KOH) for extended periods (120 hours).
• Comparison with standard electrode systems like Nafion on glassy carbon.

Main Results:

• The developed electrodes exhibit high activity, achieving 100 mA cm^-2 at 1.43 V vs RHE (1.41 V, iR-corrected).
• Exceptional stability was demonstrated under harsh conditions, with minimal performance loss over 120 hours.
• The polycarbazole-based system significantly outperformed Nafion systems at equivalent catalyst loadings.
• The strategy proved effective with low loadings of abundant catalysts.

Conclusions:

• A novel multifunctional polymer electrode offers a highly active and stable solution for water electrolysis.
• This approach provides a cost-effective and scalable method for renewable energy storage.
• The developed electrode technology has broad applicability to other electrode systems and electrochemical processes.