types and uses of platinam?

Answer 1

Platinum is used in Rings. Beyond jewelry it is also used in wire for electrical contacts, thermocouples, jet engine fuel nozzles and dentistry.

Answer 2

The polymer sheets are coated with a thin layer of platinum catalyst to increase the speed of reaction. Its electrodes are made of porous carbon.

The platinum used to coat the electrolyte is expensive; and after less than two years of operation, the electrolyte (commonly called the stack) must typically be replaced


The electrolyte’s catalyst (platinum) pulls the hydrogen directly from the methanol, venting carbon dioxide (CO2) while supplying hydrogen to the fuel cell. Operation from this point is the same as with a pure hydrogen fuel cell. The hydrogen’s proton (or positive ion) travels across the membrane electrolyte to the cathode where it retrieves its electron and combines with oxygen to form water.

The platinum used to coat the polymer electrolyte membrane is expensive, and membrane life must be lengthened before widespread use is practical. Methanol is a toxic chemical that readily mixes with water. Tasteless in up to 7 percent solutions, swallowing a liter at this concentration can be fatal. Due in part to concerns about the potential for groundwater contamination, current products are portable devices that use canisters to store methanol, and so carry very low risk for water contamination.


The platinum used as a catalyst is expensive. The potassium hydroxide electrolyte is easily poisoned by CO2, requiring expensive purification of both the hydrogen and oxygen entering the fuel cell. Potassium hydroxide (commonly called lye) is a toxic chemical and is highly corrosive as a liquid. Manufacturing and maintenance procedures are designed to help address this risk.

Answer 3

As a catalyst in the catalytic converter, an optional component of the gasoline-fueled automobile exhaust system (see "Notable characteristics" in this article).

As a catalyst in fuel cells. Reducing the amount of platinum required (and thus cost) is a major focus of fuel cell research.

Certain platinum-containing compounds are capable of crosslinking (or alkylating) with DNA and are chemotherapeutic agents owing to this capability. For example, cisplatin, Carboplatin and oxaliplatin belong to this class of drugs.

Platinum resistance thermometers.

Electrodes for use in electrolysis.

In the Clark polarographic electrode for measuring oxygen tension.

A wide range of jewellery.

As a catalyst in the curing of silicone elastomers.

As a catalyst in glow plugs in some model engines.

Crucibles for high temperature melting of glass (for example) up to 1500°C, better if alloyed with rhodium (10-40% of Rh).

ref:

http://en.wikipedia.org/wiki/Platinum

Answer 4

Platinum is an element. There is only one kind.

It is used in catalytic converters in cars and in moderate-high temperature thermocouples.

Answer 5

they use them in hydrogen fuel cells