Overview
Iridium oxide (IrO2) is a transition metal oxide prized for its exceptional stability and electrochemical properties. As one of the few oxides that remains conductive, it plays a vital role in advanced industrial applications. The compound typically appears as a black powder with a rutile crystal structure. Primary production methods include thermal decomposition of iridium salts or anodization of iridium metal. Due to iridium's rarity (annual global production ≈7 tons), IrO2 is a high-value material often traded in specialized B2B markets, particularly for technology-driven sectors.
Physical and Chemical Properties
IrO2 exhibits remarkable thermal stability, maintaining its structure up to 1100°C before decomposing. Its density of 11.66 g/cm³ reflects iridium's position as one of the densest elements. The material is chemically inert to most solvents but dissolves in hydrochloric acid with oxidizers. Electrically, it demonstrates low resistivity (≈30 μΩ·cm), outperforming many metal oxides. This property, combined with a high work function (5.3 eV), makes it ideal for interfacial layers in electronic devices. Its catalytic activity for oxygen evolution reactions is 3-5 times higher than platinum in acidic media.
Main Applications
In electrochemical applications, IrO2-coated titanium anodes (DSA®) are industry standards for chlor-alkali processes due to their corrosion resistance. The compound is indispensable for proton exchange membrane (PEM) water electrolyzers, where it facilitates oxygen evolution with 90%+ efficiency. The electronics industry utilizes thin IrO2 films as buffer layers in OLED displays to enhance hole injection. Emerging uses include neuromorphic computing memristors and pH sensors, where its stable redox behavior enables precise measurements. Medical applications include neurostimulation electrodes and implantable biosensors.
Safety and Storage
As a fine powder, IrO2 requires handling with NIOSH-approved N95 respirators to prevent pulmonary irritation. The material is generally non-flammable but may release iridium fumes if heated above 1200°C. Secondary containment is recommended for bulk storage. Optimal storage involves argon-filled desiccators or vacuum-sealed bags to prevent moisture absorption. Shelf life exceeds 5 years when stored properly. Waste disposal should follow local regulations for heavy metal compounds, typically requiring certified hazardous waste handlers.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering certified purity analysis (ICP-MS) and crystallographic verification (XRD). Technical grade (99.5%) suffices for electrodes, while electronic grade (99.99%) is mandatory for semiconductor applications. Lead times often exceed 8 weeks due to complex refining processes. Spot prices fluctuate with iridium metal markets (currently ~$4,800/oz). Consider long-term contracts with price adjustment clauses. For research quantities (1-100g), specialized chemical distributors typically offer faster fulfillment than primary producers.
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