From Atomic-Level Synthesis to Device-Scale Reactors: A Multiscale Approach to Water Electrolysis

Area of Science:

• Materials Science and Engineering
• Electrochemistry
• Catalysis

Background:

• Efficient and durable electrocatalysts are crucial for a hydrogen-powered society, yet challenges persist in water electrolysis.
• Current microlevel (synthesis/characterization) and macrolevel (evaluation systems) approaches lack comprehensive understanding and realistic simulation.
• Interface chemical engineering is key, but its application across length scales and dynamic processes needs further investigation.

Purpose of the Study:

• To propose a multiscale research framework for designing and evaluating high-performance hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalysts.
• To address limitations in understanding catalyst behavior under realistic operating conditions.
• To bridge the gap between microscale catalyst design and macroscale reactor performance.

Main Methods:

• Leveraging interface chemical engineering across micro-, nano-, and atomic scales for catalyst design.
• Employing in situ/operando characterization techniques to monitor dynamic interfacial reactions and catalyst reconstruction.
• Developing laboratory-scale membrane electrode assembly (MEA) electrochemical reactors for high current density (>1 A cm⁻²) testing under simulated industrial conditions.

Main Results:

• Demonstrated application of interface chemical engineering principles to design diverse electrocatalyst materials with enhanced activity and durability.
• Gained profound insights into HER and OER mechanisms through in situ characterization.
• Developed acidic and alkaline MEA reactors for precise electrocatalytic performance evaluation.

Conclusions:

• A multiscale framework integrating interface chemical engineering and advanced characterization is essential for advancing water electrolysis.
• Simulating industrial conditions in MEA reactors provides more authentic assessments of catalyst potential.
• Further research is needed to overcome existing challenges and capitalize on opportunities in electrocatalyst development for hydrogen production.