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Phosphoric Acid Fuel cell

Phosphoric Acid Fuel cell. Used in hospitals, nursing homes and for all commercial purposes Electrolyte: Liquid Phosphoric acid Catalyst: platinum Electrical efficiency of 40% Advantages :using impure hydrogen as fuel and 85% of the steam can be used for cogeneration. Working Diagram.

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Phosphoric Acid Fuel cell

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  1. Phosphoric Acid Fuel cell • Used in hospitals, nursing homes and for all commercial purposes • Electrolyte: Liquid Phosphoric acid • Catalyst: platinum • Electrical efficiency of 40% • Advantages :using impure hydrogen as fuel and 85% of the steam can be used for cogeneration

  2. Working Diagram

  3. Contd … • The anode and cathode reactions are the same as those in the PEM fuel cell with the cathode reaction occurring at a faster rate due to the higher operating temperature. • The increased temperature also imparts a slightly higher tolerance to impurities and phosphoric acid cells can function with 1-2 per cent carbon monoxide and a few ppm of sulphur in the reactant streams. • Simple construction, stability and low electrolyte volatility

  4. Disadvantages • Disadvantages: uses expensive platinum as catalyst • Large size and weight • Low power and current • Existing PAFC’s have outputs of 200kw and 1Mw are being tested http://www.toshiba.co.jp/product/fc/fce/nature.htm

  5. External Reforming &Internal Reforming of Fuel

  6. Major Fuel cell Plant

  7. IMP. LINKS • Link showing the working of a battery with animations: • http://www.dlt.ncssm.edu/core/c17.htm • Link showing complete overview of phosphoric acid fuel cell : • http://www.ch2bc.org/FCHandbook/TechOver1-1FCDesc.htm • Link showing the history of Phosphoric Acid Fuel Cell • http://americanhistory.si.edu/fuelcells/phos/pafcmain.htm#TOP

  8. Applications • http://www.fossil.energy.gov/programs/powersystems/fuelcells/fuelscells_phosacid.html • Industrial and other commerical applications are in server: Energy/FC_Materials.doc

  9. Activity • Operating Temperature of Phosphoric Acid Fuel Cell? • 80C • 600C • 205C • 800-1000C

  10. Activity • Electrolyte in phosphoric Acid Fuel Cell? • Ion exchange membrane • Phosphoric Acid • Ceramic • Liquid Molten Carbonate

  11. Activity • What is the catalyst used in Phosphoric Acid fuel Cell? • Nickel • Platinum • Pervoskites • None

  12. Activity • What Fuel can be used in Phosphoric Acid Fuel Cell? • H2 • CH4 +H2O • CO+H2O • All of the above

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