Phosphoric acid fuel cell

Phosphoric acid fuel cell

Phosphoric acid fuel cells (PAFC) are a type of fuel cell that uses liquid phosphoric acid as an electrolyte. The electrodes are made of carbon paper coated with a finely-dispersed platinum catalyst, which make them expensive to manufacture. They are not affected by carbon monoxide impurities in the hydrogen stream. Phosphoric acid solidifies at a temperature of 40 °C, making startup difficult and restraining PAFCs to continuous operation.

However, at an operating range of 150 to 200 °C, the expelled water can be converted to steam for air and water heating. Phosphoric acid fuel cells have been used for stationary applications with a combined heat and power efficiency of about 80%, and they continue to dominate the on-site stationary fuel cell market.

Major manufacturers of PAFC technology include UTC Power (also known as UTC Fuel Cells), a unit of United Technologies (NYSE: UTX), as well as HydroGen Corporation (NASDAQ: HYDG). As of 2005, there were close to 300 "PureCell"® 200 kW units by UTC Power in service globally.

ee also

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*Glossary of fuel cell terms

External links

* [ National Pollutant Inventory - Phosphoric acid fact sheet]

External links

* [ UTC Power Official Site]
* [ Capstone Turbine Official Site]
* [,5672,0249,00.html The PureCell® M400 Power System Overview]
* [,5672,0254,00.html The PureCell® Model 200 Power System Overview]
* [,5672,0125,00.html PureComfort® Solutions System Overview]

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