IrO2/Ir Composite Nanoparticles (IrO2@Ir) Supported on TiNxOy Coated TiN: Efficient and Robust Oxygen Evolution Reaction Catalyst for Water Electrolysis

Swapnil Sanjay Karade, Raghunandan Sharma*, Saso Gyergyek, Per Morgen, Shuang Ma Andersen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

It is crucial but challenging to reduce the required noble-metal loading without compromising the catalytic performance of oxygen evolution reaction (OER) catalysts. This study presents a highly active OER catalyst composed of IrO2 with Ir rich surface (IrO2@Ir) nanoparticles supported over nano TiN coated with TiOxNy (IrO2@Ir/TiN). The present approach demonstrates superior OER catalysts with high activity through small, uniformly dispersed IrO2@Ir nanoparticles, along with high durability owing to robust catalyst support and strong catalyst-support interaction. The synthesized IrO2@Ir/TiN with an Ir loading of 40 wt % exhibits a mass-normalized OER activity of 637 AgIr−1, which is 2.4 times that of the unsupported commercial benchmark IrO2 OER electrocatalyst. The fine nanoparticles and high activity enable significant (∼60 %) reduction in the Ir metal loading required to obtain equivalent OER performance. In addition, when evaluated through an accelerated stress test using potential cycling, the catalyst exhibits outstanding durability (79 % retention) compared to that of the commercial equivalent (66 % retention). The OER activity loss was attributed to the catalyst dissolution (30 % loss) and the catalyst particle growth (70 %), with no measurable loss due to the TiN support corrosion. The development of ultra-fine IrO2@Ir nanoparticles and robust ceramic catalyst support significantly improved the Ir utilization and open a new perspective for supported OER catalyst.

Original languageEnglish
Article numbere202201470
JournalChemCatChem
Volume15
Issue number4
Number of pages12
ISSN1867-3899
DOIs
Publication statusPublished - 20. Feb 2023

Keywords

  • iridium oxide@iridium
  • microwave
  • oxygen evolution reaction
  • titanium nitride
  • titanium oxonitride

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