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206237

Sigma-Aldrich

Iridium(IV) oxide

99.9% trace metals basis

Synonym(s):

Iridium dioxide

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About This Item

Linear Formula:
IrO2
CAS Number:
Molecular Weight:
224.22
EC Number:
MDL number:
UNSPSC Code:
12352303
eCl@ss:
38191204
PubChem Substance ID:
NACRES:
NA.23

Quality Level

assay

99.9% trace metals basis

form

powder

application(s)

battery manufacturing

SMILES string

O=[Ir]=O

InChI

1S/Ir.2O

InChI key

HTXDPTMKBJXEOW-UHFFFAOYSA-N

General description

Iridium oxide is a ceramic material with unique properties like long-term stability, sensitivity, electrochemical catalytic activity, and excellent biocompatibility. It can be formed from Ir metal by different methods like thermal decomposition, reactive sputtering, and electrochemical deposition. It is widely used in bio-electronic devices.

Application

Iridium(IV) oxide can be used as:
  • An indicator electrode in solid-state pH sensors.
  • Coating material for stimulation electrodes.
  • An anodic catalyst for oxygen evolution through a water-splitting reaction in a polymer electrolyte membrane (PEM) cell.

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)


Certificates of Analysis (COA)

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Narayanappa Sivasankar et al.
Journal of the American Chemical Society, 133(33), 12976-12979 (2011-07-21)
A surface hydroperoxide intermediate has been detected upon oxidation of water at an Ir oxide nanocluster catalyst system under pulsed excitation of a [Ru(bpy)(3)](2+) visible light sensitizer by recording of the OO vibrational mode at 830 cm(-1). Rapid-scan FT-IR spectroscopy
Igor A Ges et al.
Biosensors & bioelectronics, 34(1), 30-36 (2012-03-09)
Release of neurotransmitters and hormones by calcium regulated exocytosis is a fundamental cellular/molecular process that is disrupted in a variety of psychiatric, neurological, and endocrine disorders. Therefore, this area represents a relevant target for drug and therapeutic development, efforts that
Yixin Zhao et al.
Small (Weinheim an der Bergstrasse, Germany), 7(14), 2087-2093 (2011-06-17)
A facile, in-situ deposition route to stable iridium oxide (IrO(x)·nH(2)O) nanoparticle thin films from [Ir(OH)(6)](2-) solutions is reported. The [Ir(OH)(6)](2-) solution, made by alkaline hydrolysis of [IrCl(6)](2-), is colorless and stable near neutral pH, and forms blue IrO(x)·nH(2)O nanoparticle suspensions
Chia-Ching Wang et al.
Langmuir : the ACS journal of surfaces and colloids, 27(23), 14253-14259 (2011-11-04)
In this study, we employed density functional theory (DFT) to investigate the oxidation of ammonia (NH(3)) on the IrO(2)(110) surface. We characterized the possible reaction pathways for the dehydrogenation of NH(x) species (x = 1-3) and for the formation of
Elisabet Prats-Alfonso et al.
Biosensors & bioelectronics, 39(1), 163-169 (2012-08-04)
This work demonstrates the implementation of iridium oxide films (IROF) grown on silicon-based thin-film platinum microelectrodes, their utilization as a pH sensor, and their successful formatting into a urea pH sensor. In this context, Pt electrodes were fabricated on Silicon

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