Oxide-supported IrNiOx core-shell particles as efficient, cost-effective, and stable catalysts for electrochemical water splitting

Hong Nhan Nong, Hyung Suk Oh, Tobias Reier, Elena Willinger, Marc Georg Willinger, Valeri Petkov, Detre Teschner, Peter Strasser

Research output: Contribution to journalArticlepeer-review

307 Scopus citations

Abstract

Active and highly stable oxide-supported IrNiOx core-shell catalysts for electrochemical water splitting are presented. IrNix@IrOx nanoparticles supported on high-surface-area mesoporous antimony-doped tin oxide (IrNiOx/Meso-ATO) were synthesized from bimetallic IrNix precursor alloys (PA-IrNix/Meso-ATO) using electrochemical Ni leaching and concomitant Ir oxidation. Special emphasis was placed on Ni/NiO surface segregation under thermal treatment of the PA-IrNix/Meso-ATO as well as on the surface chemical state of the particle/oxide support interface. Combining a wide array of characterization methods, we uncovered the detrimental effect of segregated NiO phases on the water splitting activity of core-shell particles. The core-shell IrNiOx/Meso-ATO catalyst displayed high water-splitting activity and unprecedented stability in acidic electrolyte providing substantial progress in the development of PEM electrolyzer anode catalysts with drastically reduced Ir loading and significantly enhanced durability.

Original languageEnglish
Pages (from-to)2975-2979
Number of pages5
JournalAngewandte Chemie - International Edition
Volume54
Issue number10
DOIs
StatePublished - Mar 2 2015

Keywords

  • Core-shell nanoparticles
  • Oxide supports
  • Oxygen evolution reaction
  • Water splitting
  • X-ray photoelectron spectroscopy

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