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Long-Term Stability Challenges and Opportunities in Acidic Oxygen Evolution Electrocatalysis.

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Summary

This review addresses challenges in stable oxygen evolution reaction (OER) catalysts for polymer electrolyte membrane water electrolysis (PEMWE) hydrogen production. It discusses instability factors and solutions, guiding towards industrial PEMWE application.

Keywords:
Operando CharacterizationOxygen Evolution ReactionPolymer Electrolyte MembraneStructure-Performance RelationshipWater Electrolysis

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Polymer electrolyte membrane water electrolysis (PEMWE) is a key technology for sustainable hydrogen generation.
  • The widespread adoption of PEMWE is hindered by the lack of stable oxygen evolution reaction (OER) catalysts, especially in acidic media.

Purpose of the Study:

  • This review comprehensively analyzes critical factors contributing to catalyst instability during PEMWE.
  • It explores potential strategies and solutions to enhance catalyst durability.
  • The study provides insights and a roadmap for advancing PEMWE technology.

Main Methods:

  • The review synthesizes existing literature on catalyst degradation mechanisms in PEMWE.
  • It discusses various instability factors, including mechanical, chemical, and structural degradation pathways.
  • In situ/operando characterization techniques and their role in understanding degradation are highlighted.

Main Results:

  • Key instability issues identified include mechanical peeling, substrate corrosion, active site dissolution, and oxide reconstruction.
  • Lattice oxygen-participated reaction pathways can lead to the collapse of oxide crystal structures.
  • Understanding these degradation mechanisms is crucial for designing robust OER catalysts.

Conclusions:

  • Addressing catalyst instability is paramount for the industrialization of PEMWE.
  • Future research should focus on rigorous stability testing, advanced characterization, and economic feasibility.
  • Optimizing the interplay between catalyst structure, activity, and stability is essential for practical PEMWE systems.