What Is Rhodium?
Rhodium is a silver-white metallic element that’s highly reflective and resistant to corrosion. It’s the rarest and most expensive precious metal in the world.
Rhodium is one of six metals in the platinum group. The others are platinum, palladium, osmium, iridium, and ruthenium.
The name “rhodium” comes from the Greek word “rhodon,” meaning rose. Rhodon refers to the rose-red color of rhodium’s salts.
What Is Rhodium Used for?
Rhodium is usually combined with other materials, such as platinum or palladium, as part of an alloy. These alloys appear in items such as furnace coils, aircraft engines, electrodes for aircraft spark plugs, and laboratory crucibles.
The most common use for rhodium, though, is in vehicles’ catalytic converters, either as a standalone element or in tandem with palladium or platinum. Rhodium catalysts help cut down on nitrous oxide in vehicle exhaust.