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Iridium Stabilizes Ceramic Titanium Oxynitride Support for Oxygen Evolution Reaction.

Gorazd Koderman Podboršek1,2, Luka Suhadolnik3,4, Anja Lončar1,5

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Reducing iridium in proton exchange membrane (PEM) electrolyzers is key. This study shows iridium nanoparticles and single atoms stabilize titanium oxynitride (TiON) ceramic supports during oxygen evolution reactions (OER).

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Proton exchange membrane (PEM) electrolyzers require reduced iridium loading for cost-effectiveness.
  • Electrically conductive ceramic supports with high stability are needed for iridium nanoparticles under harsh oxygen evolution reaction (OER) conditions.

Purpose of the Study:

  • To investigate nanotubular titanium oxynitride (TiON) as a support for iridium nanoparticles in PEM electrolyzers.
  • To understand the structural and compositional stability of TiON under OER conditions when loaded with iridium.

Main Methods:

  • Advanced characterization platform combining electrochemical treatment in a floating electrode configuration.
  • Identical location transmission electron microscopy (IL-TEM) analysis.
  • Density functional theory (DFT) calculations.

Main Results:

  • Atomically resolved transformations of TiON during OER were observed.
  • Iridium nanoparticles and single atoms were found to stabilize the TiON support.
  • A marked suppression of TiON oxidation tendency under OER conditions was confirmed.

Conclusions:

  • Nanotubular TiON is a promising support material for iridium electrocatalysts.
  • Iridium, in both nanoparticle and single-atom forms, enhances the stability of the TiON support during OER.
  • This stabilization effect is crucial for developing efficient and durable PEM electrolyzers with reduced iridium content.