Oxygen Evolution Electrocatalysts for the Proton Exchange Membrane Electrolyzer: Challenges on Stability.

Area of Science:

• Electrochemistry
• Materials Science
• Sustainable Energy

Background:

• Proton exchange membrane (PEM) electrolyzers are key for clean hydrogen production and carbon neutrality.
• The oxygen evolution reaction (OER) is kinetically slow and a major bottleneck in water splitting efficiency.
• Current OER catalysts often lack the stability required for industrial PEM electrolyzer applications.

Purpose of the Study:

• To systematically review the origins of OER instability in PEM electrolyzers.
• To discuss rational strategies for designing stable electrocatalysts.
• To highlight advanced characterization techniques for understanding deactivation mechanisms.

Main Methods:

• Review of existing literature on OER catalyst deactivation and stability.
• Analysis of catalyst design strategies: doping, leaching, support effects, coordination, strain, phase, and facet engineering.
• Discussion of in situ/operando characterization techniques for mechanistic insights.

Main Results:

• Identified intrinsic material deactivation and extrinsic plant-induced destabilization as key challenges.
• Demonstrated how various catalyst engineering strategies can enhance OER stability.
• Emphasized the importance of advanced characterization for understanding catalyst evolution and failure modes.

Conclusions:

• Addressing OER stability is crucial for the practical application of PEM electrolyzers.
• Rational catalyst design and advanced characterization are vital for developing long-term, stable electrocatalysts.
• Future research should focus on creating robust catalysts for efficient and sustainable hydrogen production.