Iridium(IV) oxide
CAS 12030-49-8
IrO₂ is the anode catalyst of the green-hydrogen buildout — the only practically durable oxygen-evolution catalyst for PEM water electrolyzers, and the active component of industrial mixed-metal-oxide electrode coatings.
Typical specification
| Molecular formula | IrO₂ |
|---|---|
| Molecular weight | 224.22 |
| Purity (metals basis) | ≥ 99.9% |
| Iridium content | ≥ 84.5% |
| Appearance | Black to blue-black powder |
| BET surface area | Grade-dependent; specified per lot |
| Grades | Standard / high-surface-area electrolyzer grade |
| HS code (export) | 2843900099 |
Lot-specific COA issued with every shipment. SDS and ICP elemental impurity data available on request.
Where IrO₂ is used
PEM electrolyzer anodes
The benchmark oxygen-evolution catalyst in acidic PEM water electrolysis — the application driving iridium demand as electrolyzer capacity scales, with surface area and crystallinity grades matched to MEA processes.
Industrial electrode coatings and sensors
The active phase in IrO₂–Ta₂O₅ coated-titanium anodes for electrogalvanizing and electrowinning, and the sensing layer in solid-state pH electrodes.
Storage and shipping
Storage. Store sealed and dry; chemically inert under normal handling.
Shipping. Not classified as dangerous goods; high-value lots move via insured valuables logistics. Fuel-cell/electrolyzer grades may fall under a dedicated customs line — classification confirmed per shipment.
Packaging. 1 g · 5 g · 25 g · 100 g · Custom lots by contained-metal weight
Synonyms
- Iridium dioxide
- Iridium oxide powder
- IrO2 OER catalyst
- PEM electrolyzer anode catalyst
Frequently asked questions
How volatile is iridium pricing and how do you handle it?
Iridium has moved several-fold over recent years on a very thin market. Every quote states its price reference and validity window; the metal leg locks at order confirmation, and MEA manufacturers on recurring schedules can fix forward.
Do you take back iridium residues?
Yes — at iridium's price level recovery is almost always worthwhile. Residues, spent coatings and off-spec lots are assayed on receipt and the iridium credited against future supply.
What documentation is included?
Every lot ships with a certificate of analysis stating assayed metal content, plus an English SDS. ICP trace-metal panels are available on request.