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Iridium Stabilizes Ceramic Titanium Oxynitride Support for Oxygen Evolution Reaction
Gorazd Koderman Podboršek1,2, Luka Suhadolnik3,4, Anja Lončar1,5
1Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia.
ACS Catalysis
|December 26, 2022
Summary
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).
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.
