title: Oxide-supported IrNiO(x) core-shell particles as efficient, cost-effective, and stable catalysts for electrochemical water splitting.
abstract: Active and highly stable oxide-supported IrNiO(x) core-shell catalysts for electrochemical water splitting are presented. IrNi(x)@IrO(x) nanoparticles supported on high-surface-area mesoporous antimony-doped tin oxide (IrNiO(x)/Meso-ATO) were synthesized from bimetallic IrNi(x) precursor alloys (PA-IrNi(x) /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-IrNi(x)/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 IrNiO(x)/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.
authors.affiliation: Department of Chemistry, Technical University Berlin, Strasse des 17.Juni 124, TC 03, 10623 Berlin (Germany).
authors.forename: Hong Nhan
authors.initials: HN
authors.lastname: Nong
authors.forename: Hyung-Suk
authors.initials: HS
authors.lastname: Oh
authors.forename: Tobias
authors.initials: T
authors.lastname: Reier
authors.forename: Elena
authors.initials: E
authors.lastname: Willinger
authors.forename: Marc-Georg
authors.initials: MG
authors.lastname: Willinger
authors.forename: Valeri
authors.initials: V
authors.lastname: Petkov
authors.forename: Detre
authors.initials: D
authors.lastname: Teschner
authors.forename: Peter
authors.initials: P
authors.lastname: Strasser
keywords: X-ray photoelectron spectroscopy; core-shell nanoparticles; oxide supports; oxygen evolution reaction; water splitting