Atomically Dispersed Iridium on Indium Tin Oxide Efficiently
Catalyzes Water Oxidation
Version 2 2020-07-10, 18:40
Version 1 2020-07-01, 12:07
Posted on 2020-07-10 - 18:40
Heterogeneous catalysts
in the form of atomically dispersed metals
on a support provide the most efficient utilization of the active
component, which is especially important for scarce and expensive
late transition metals. These catalysts also enable unique opportunities
to understand reaction pathways through detailed spectroscopic and
computational studies. Here, we demonstrate that atomically dispersed
iridium sites on indium tin oxide prepared via surface organometallic
chemistry display exemplary catalytic activity in one of the most
challenging electrochemical processes, the oxygen evolution reaction
(OER). In situ X-ray absorption studies revealed
the formation of IrVO intermediate under OER conditions
with an Ir–O distance of 1.83 Å. Modeling of the reaction
mechanism indicates that IrVO is likely a catalyst
resting state, which is subsequently oxidized to IrVI enabling
fast water nucleophilic attack and oxygen evolution. We anticipate
that the applied strategy can be instrumental in preparing and studying
a broad range of atomically dispersed transition metal catalysts on
conductive oxides for (photo)electrochemical applications.
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Lebedev, Dmitry; Ezhov, Roman; Heras-Domingo, Javier; Comas-Vives, Aleix; Kaeffer, Nicolas; Willinger, Marc; et al. (2020). Atomically Dispersed Iridium on Indium Tin Oxide Efficiently
Catalyzes Water Oxidation. ACS Publications. Collection. https://doi.org/10.1021/acscentsci.0c00604
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AUTHORS (10)
DL
Dmitry Lebedev
RE
Roman Ezhov
JH
Javier Heras-Domingo
AC
Aleix Comas-Vives
NK
Nicolas Kaeffer
MW
Marc Willinger
XS
Xavier Solans-Monfort
XH
Xing Huang
YP
Yulia Pushkar
CC
Christophe Copéret
KEYWORDS
OER conditionsreaction mechanismiridium sitesAtomically Dispersed IridiumIr VItransition metalsconductive oxidesindium tin oxideIndium Tin Oxide Efficiently Cataly...electrochemical processessurface organometallic chemistry di...atomicallytransition metal catalystsoxygen evolution reaction1.83 Å. Modelingwater nucleophilic attackreaction pathwaysX-ray absorption studiesoxygen evolution