Small,
Narrowly Distributed Iridium Nanoparticles Supported on Indium Tin
Oxide for Efficient Anodic Water Oxidation
Dmitry Lebedev
Christophe Copéret
10.1021/acsaem.8b01724.s001
https://acs.figshare.com/articles/journal_contribution/Small_Narrowly_Distributed_Iridium_Nanoparticles_Supported_on_Indium_Tin_Oxide_for_Efficient_Anodic_Water_Oxidation/7471466
Decreasing
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 Ir<sub>NP</sub>–ITO material is very
active and stable in water oxidation, reaching a current of 10 A g<sub>Ir</sub><sup>–1</sup> 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.
2018-12-13 00:00:00
ITO
particle surface
water oxidation
OER efficiency
X-ray photoelectron spectroscopy studies
Indium Tin Oxide
anodic water oxidation catalysts
surface Ir-oxo-hydroxide layer
immobilizing 1.5 nm Ir nanoparticles
conductive indium tin oxide support
OER conditions
Iridium Nanoparticles
NP
layer forms
iridium particles
1.470 V vs RHE
electrochemical tests
Efficient Anodic Water Oxidation
resolution electron microscopy
electrode design
Ir content
metal content
acidic media