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Small, Narrowly Distributed Iridium Nanoparticles Supported on Indium Tin Oxide for Efficient Anodic Water Oxidation
journal contribution
posted on 2018-12-13, 00:00 authored by Dmitry Lebedev, Christophe CopéretDecreasing
the noble metal content while maintaining high catalytic activity
is a critical requirement for the development of efficient anodic
water oxidation catalysts in acidic media. In the present work, we
developed a method for immobilizing 1.5 nm Ir nanoparticles on a conductive
indium tin oxide support. In addition to having a low Ir content of
4.1 wt %, the obtained IrNP–ITO material is very
active and stable in water oxidation, reaching a current of 10 A gIr–1 at 1.470 V vs RHE. Our electrode design
allows for convenient analysis of the catalyst after the electrochemical
tests. Employing high resolution electron microscopy, we show that
under the OER conditions, the core of iridium particles stays metallic,
while amorphous layer forms on the particle surface, which we attribute
to Ir-oxo-hydroxide based on our X-ray photoelectron spectroscopy
studies. The surface Ir-oxo-hydroxide layer is responsible for the
high OER efficiency of the supported catalyst.
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ITOparticle surfacewater oxidationOER efficiencyX-ray photoelectron spectroscopy studiesIndium Tin Oxideanodic water oxidation catalystssurface Ir-oxo-hydroxide layerimmobilizing 1.5 nm Ir nanoparticlesconductive indium tin oxide supportOER conditionsIridium NanoparticlesNPlayer formsiridium particles1.470 V vs RHEelectrochemical testsEfficient Anodic Water Oxidationresolution electron microscopyelectrode designIr contentmetal contentacidic media
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