Ion-Exchange Membrane-Centric Durability Testing and Degradation Characterization for Industry-Relevant CO₂ Reduction

Area of Science:

• Electrochemistry
• Materials Science
• Chemical Engineering

Background:

• Electrochemical CO2 reduction is key for sustainable fuel production.
• Current CO2 electrolysis cells show promise but lack long-term durability.
• Industrial viability requires device lifetimes exceeding 35,000 hours.

Purpose of the Study:

• To review ion-exchange membrane (IEM) degradation mechanisms in CO2 electrolysis.
• To propose a framework for characterizing IEM degradation.
• To accelerate the development of durable CO2 electrolysis systems.

Main Methods:

• Overview of existing literature on IEM degradation.
• Proposal for pre- and post-durability testing characterization methods.
• Encouragement of operando characterization alongside accelerated stress tests.

Main Results:

• Identified critical degradation mechanisms hindering long-term operation.
• Proposed a systematic approach to elucidate IEM failure modes.
• Highlighted the need for comprehensive degradation analysis across the entire electrolysis cell.

Conclusions:

• Significant improvements in device durability are necessary for industrial CO2 electrolysis.
• Standardized characterization methods are crucial for understanding and mitigating IEM degradation.
• Integrated operando and accelerated testing strategies will advance the field toward meeting durability targets.