High temperature PEM fuel cells

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  • TraficcontrolMonitoring of windmills
  • Real world operation targets
  • High temperature PEM fuel cells

    1. 1. fuel cell Technology<br />Samuel Simon Araya <br />Institute of Energy Technology, Aalborg University<br />ssa@iet.aau.dk<br />Supervisor: Søren Knudsen Kær<br />Co-supervisor: Søren Juhl Andreasen<br />
    2. 2. Outline<br />Introduction to Fuel Cells<br />HT-PEM fuel cells<br />Conclusions<br />
    3. 3. Introduction<br />”Imagine driving home in a fuel cell car with nothing but pure water dripping from the tailpipe. Imagine a laptop computer that runs for 30 hours on a single charge. Imagine a world where you plug your house into your car and power lines are a distant memory.”<br />-Fuel cell Fundamentals by O’Hayre et al.<br />
    4. 4. What is a Fuel cell?<br />Fuel cells are electrochemical devices that continuously convert the internal energy of gases directly into electricity,<br />Figure source: http://ssrl.slac.stanford.edu/nilssongroup/nilsson_projects.html (15/ 02/2010)<br />
    5. 5. The History<br />1800 – W. Nicholson and A. Carlisle first described electrolysis<br />1836 – William Grove fuel cell Demonstration<br />1889 – three separate teams performed various fuel cell experiments<br />1960’s – T. Grubb and L. Neidrach Invented PEMFC technology at GE<br />1990’s to the present – worldwide research on all types of fuel cells<br />
    6. 6. Advantages<br />More efficient<br />They can be all solid parts – potential for reliability and durability<br />No moving parts – Silent<br />NOx, SOx and Particulate emissions virtually zero<br />
    7. 7. Disadvantages<br /><ul><li>Cost
    8. 8. Power density
    9. 9. Susceptibility to environmental poisons
    10. 10. Durability</li></li></ul><li>Types of Fuel Cells<br />Phosphoric acid fuel cell (PAFC)<br />Polymer Electrolyte membrane fuel cell (PEMFC)<br />Alkaline Fuel cell (AFC)<br />Molten carbonate Fuel cell (MCFC)<br />Solid oxide fuel cell (SOFC)<br />
    11. 11. HT-PEM Fuel cells<br />Employ a thin solid polymer electrolyte<br />-PBI (Phosphoric acid doped)<br />Degradation due to<br />- Peroxide attacks <br /><ul><li> Pt agglomeration
    12. 12. Acid bleaching….</li></li></ul><li>Applications<br /><ul><li>Transportation
    13. 13. Stationary and semi- stationary power supplies
    14. 14. Cogeneration – MicroCHP
    15. 15. Mobile – cell phones, laptops and mobile monitoring devices</li></li></ul><li>Achievements and targets<br />Cost<br />Stationary application 400 -750 $/kW<br />Targets<br />Durability<br /><ul><li>Automotive -5000 hours
    16. 16. Stationary - 40 000 hours</li></ul>Background photo source: http://www.flickr.com/photos/rasputern/3462874340/ (15/02/2010) <br />Data source: U.S department of Energy (DOE) <br />
    17. 17. Conclusions<br />We are halfway to tackle both the cost and durability challenges for fuel cells to be commercially competitive and the trend is faster than ever<br />HT-PEM fuel cells are very promising but Material degradation remains the main issue<br />
    18. 18. Thank you for you attention<br />

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