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Supported Iridium-based Oxygen Evolution Reaction Electrocatalysts - Recent Developments.

Leonard Moriau1, Milutin Smiljanić1, Anja Lončar1,2

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Summary

Iridium supports are crucial for acidic proton exchange membrane water electrolyzers (PEMWE). This review examines materials that enhance iridium catalyst performance for the oxygen evolution reaction (OER) in PEMWE.

Keywords:
Acidic mediaElectrocatalysisIridiumOxygen evolution reaction• Supported catalysts

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Commercialization of proton exchange membrane water electrolyzers (PEMWE) is limited by the high cost and scarcity of iridium (Ir) based oxygen evolution reaction (OER) catalysts.
  • Developing efficient and stable supports is key to improving iridium utilization and catalyst performance in acidic media.

Purpose of the Study:

  • To critically review materials proposed as supports for iridium-based OER catalysts in acidic media.
  • To analyze the impact of different support materials on iridium nanoparticle dispersion, activity, and stability.

Main Methods:

  • Extensive literature review of materials for OER supports in acidic conditions.
  • Analysis of reported effects of supports on iridium catalyst performance.

Main Results:

  • Not all materials can withstand the harsh oxidative and acidic conditions of OER in PEMWE.
  • Support selection significantly influences iridium catalyst dispersion, activity, and long-term stability.

Conclusions:

  • Identifying suitable supports is essential for advancing PEMWE technology.
  • Further research into robust support materials will enhance the economic viability of iridium-based OER catalysts.